Answers
Answer:
The answer is 15 sExplanation:
The time taken for the car to reach
30 m/s can be found by using the formula
\(t = \frac{v}{a} \\ \)
where
a is the acceleration
v is the velocity
t is the time
From the question we have
\(t = \frac{30}{2} \\ \)
We have the final answer as
15 sHope this helps you
Related Questions
No no no no. no no no no
Answers
A 1 meter wide door is initially open at an angle of 30o as shown (top view). You push with 20 N force in the middle of the door as shown and the door rotates around the hinge on the left. The door has a rotational inertia =3.0 kg m2. The angular acceleration of the door will be:
Answers
Answer:
angular acceleration = 1.67 rad/s²
Explanation:
given data
door wide = 1 m
initially ope angle = 30°
push force = 20 N
rotational inertia = 3.0 kg m²
solution
we apply force at middle so length will be here r1 = \(\frac{1}{2}\) = 0.5 m
and
now we get here torque that is express as
torque τ = Force × r1 × sin30 ......................1
put her value and we get
torque τ = 20 × 0.5 × sin30
torque τ = 5 Nm
and we know
torque = rotational inertia × angular acceleration .......................2
put her value and we get angular acceleration
angular acceleration = \(\frac{5}{3}\)
angular acceleration = 1.67 rad/s²
Which equation is most likely used to determine the acceleration from a velocity vs. time graph?
O a=
O m=
O a=
Om=
Δν
V₂-V1
X2-X1
AV
m
X2-X1
V₂-V1
Answers
The equation most likely used to determine acceleration from a velocity vs. time graph is a = Δv / Δt.
Acceleration is a fundamental concept in physics that refers to the rate at which an object's velocity changes over time. It is defined as the change in velocity divided by the change in time.
Mathematically, acceleration (a) is given by the equation:
a = Δv / Δt
where:
a represents acceleration
Δv represents the change in velocity (the difference between the final velocity and the initial velocity)
Δt represents the change in time (the difference between the final time and the initial time)
In this equation, "a" represents acceleration, Δv represents the change in velocity, and Δt represents the change in time. By calculating the ratio of the change in velocity to the change in time, we can determine the average acceleration over that time interval.
Therefore, The most likely equation used to calculate acceleration from a velocity vs. time graph is a = Δv /Δt.
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An airbys A380 airliner lands at 30 m/s. Partially loaded, its mass is 480000 kg. The engines apply reverse thrust for 12s to slow the plane to 25 m/s.How much thrust did the engines apply?
Answers
To determine the thrust applied by the engines, we can use Newton's second law of motion, which states that force (thrust) is equal to mass times acceleration. In this case, we need to calculate the force required to decelerate the plane from 30 m/s to 25 m/s in 12 seconds.
First, we calculate the change in velocity (∆v):
\(\displaystyle\sf \Delta v=25\,m/s-30\,m/s=-5\,m/s\)
Next, we calculate the acceleration (∆a) using the formula:
\(\displaystyle\sf \Delta a=\frac{\Delta v}{\Delta t}\)
where ∆t is the change in time, which is 12 seconds in this case.
\(\displaystyle\sf \Delta a=\frac{-5\,m/s}{12\,s}\)
Now, we can determine the force (thrust) applied by the engines using Newton's second law:
\(\displaystyle\sf F=m\cdot a\)
where m is the mass of the airplane, which is 480000 kg.
\(\displaystyle\sf F=480000\,kg\cdot \left(\frac{-5\,m/s}{12\,s}\right)\)
Calculating the result:
\(\displaystyle\sf F=-200000\,N\)
Therefore, the engines applied a thrust of -200000 Newtons (N) to decelerate the plane. The negative sign indicates that the thrust is in the opposite direction of the motion.
It is easier to open the lid of a can using a spoon why?
Answers
Answer:
It depends on how you use the spoon...
if you are keeping one end of the spoon and pressing other end, the force you provide is supported by the force due to gravity... Hence it is easy to open this way :)
F + G ... Where F is the force you provide and G is the force due to gravity.
how can empiricism assist you as a teacher to achieve your goals in a classroom
Answers
Empiricism is the notion that all ideas are derived from experience, that all ideas may be relevant or are about experiences, or that all prepositions and beliefs that are seen to be reasonable are known or justified largely by experience. The main function of experience is explained by empiricism. Empiricism maintains that experience serves as the foundation for all knowledge.
Empiricism plays a major role in the psychological history of America and Britain. Psychology is unjustified in light of human-made scientific knowledge. Empiricism was a key component of ancient, medieval, and contemporary philosophy. The popular sense of the day seemed to be empiricist (Britannica). Empiricism was seen to be a crucial force resisting the pretense of speculative rationalist philosophy. Even if they accepted the majority of the significant information that was nonempirical, most medieval philosophers adopted the empiricist approach, at least in terms of concepts.
Empiricism, therefore, takes on many forms. Their relaxation is the major factor that separates them. According to the widely accepted explanation, people's perceptions of their physical environment are influenced by their experiences. According to the phenomenalist interpretation, assistance merely benefits a person's sensory experience.
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Which correctly describes a different evolutionary stage of a star like the sun?
A) it’s forms from a cold, dusty molecular cloud
B) During a yellow giant stage, it burns carbon in its core and helium in the shell surrounding the core.
C) After leaving the main sequence, its core is stable due to electron degeneracy
D) It becomes a white dwarf after exploding as a supernova
E)During a red giant stage, its core contracts and cools
Answers
Answer:
Explanation:
The correct option that describes a different evolutionary stage of a star like the sun is:
D) It becomes a white dwarf after exploding as a supernova
This is because a star like the sun does not have enough mass to undergo a supernova explosion. After it has exhausted all the fuel in its core, it will evolve into a red giant and then a planetary nebula, leaving behind a small, hot, dense remnant known as a white dwarf. Supernovae occur in much more massive stars that have cores that can collapse to form a neutron star or black hole.
What is torque? In general terms
Answers
Torque is a measure of the force that can cause an object to rotate about an axis. (answer taken from Khan Academy).
Amateur radio operators in the United States can transmit on several bands. One of those bands consists of radio waves with a wavelength near 15.m. Calculate the frequency of these radio waves. Round your answer to 2 significant digits.
Answers
Answer:
20 MHz
Explanation:
Since speed of radio waves = speed of light = c and for a wave, v = fλ where v = speed of wave, f = frequency and λ = wavelength.
Given that λ = 15 m and v = c = 3 × 10⁸ m/s
f = v/λ
substituting the values of the variables into the equation, we have
f = v/λ = 3 × 10⁸ m/s ÷ 15 m
= 0.2 × 10⁸ Hz
= 2 × 10⁷ Hz
= 20 × 10⁶ Hz
= 20 MHz
If an object is placed between a convex lens and its focal point, which type of image will be produced?
Answers
Nearly all the cells in an organism have identical ? , which contain cell instructions.
Answers
Answer:
Nearly all cells in an organism contain identical DNA, and each DNA strand may contain hun- dreds or thousands of individual genes. ... No, cells only transcribe genes as they are needed to make specific proteins.
What is the electric potential energy of the group of charges in the figure? (Figure 1)
Answers
that the relative placements of the charges as well as their multiples affect a set of ions' potential energy. When the specific charge have the same sign or have equal signs, the energy is positive. Or else, it is negative.
How is potential energy calculated?The force acting just on two objects affects the potential energy formula. The formula for gravitational force is P.E. (= mgh, where g seems to be the acceleration caused by gravity (9.8 m/s2 at the earth's surface) while h represents the elevation in metres.
What is a system with two charges' potential energy?As a result, the system's potential energy equals the sum of a work that was done to set up the entire system of two counts. The potential energy that exists in the combination of two charges in such an external field can be stated as follows: q1V(r1) = q2V(r2) + (q1q2/4or12).
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A manometer using oil (density 0.900 g/cm3) as a fluid is connected to an air tank. Suddenly the pressure in the tank increases by 8.33 mmHg. Density of mercury is 13.6 g/cm3.A .By how much does the fluid level rise in the side of the manometer that is open to the atmosphere? (cm)B. By how much does the fluid level rise in the side of the manometer that is open to the atmosphere if the manometer used mercury instead? (cm)
Answers
ANSWER:
(a) 6.3 cm
(b) 0.42 cm
STEP-BY-STEP EXPLANATION:
Given:
Density of oil = 0.9 g/cm^3
Density of mercury = 13.6 g/cm^3
Rise in the height of the mercury = 8.33 mm of Hg = 0.833 cm of Hg
(a)
The change in pressure is:
\(\Delta P=\rho\cdot g\cdot\Delta h\)The change in pressure when oil is used is:
\(\Delta P=\rho_{\text{oil}}\cdot g\cdot d\)Equating the above two equation
\(\begin{gathered} \rho\cdot g\cdot\Delta h=\rho_{\text{oil}}\cdot g\cdot d \\ \text{ solving for d:} \\ d=\frac{\rho\cdot\Delta h}{\rho_{\text{oil}}} \\ d=\frac{13.6\cdot0.833}{0.9} \\ d=12.59\text{ cm} \end{gathered}\)The amount of fluid rise is half the difference of level, so the height of rise in the oil
\(\begin{gathered} \Delta h_{oil}=\frac{d}{2} \\ \text{ replacing} \\ \Delta h_{oil}=\frac{12.59}{2}=6.295\cong6.3 \\ \Delta h_{oil}=6.3\text{ cm} \end{gathered}\)(b) If the manometer uses mercury then
\(\begin{gathered} \Delta h^{\prime}=\Delta h_{oil}\cdot\mleft(\frac{\rho_{oil}}{\rho}\mright) \\ \text{ replacing:} \\ \Delta h^{\prime}=6.3\cdot\mleft(\frac{0.9}{13.6}\mright) \\ \Delta h^{\prime}=0.42\text{ cm} \end{gathered}\)I need help with part B plsss !!
Answers
The time taken for the object to travel the given height is determined as 12.48 seconds.
What is time of motion?
Time of motion of an object is the total time taken by the object to travel a given height or distance.
Time taken for the boulder to reach the groundThe time of motion of the boulder is calculated as follows;
h = vt + ¹/₂gt²
where;
h is the height of fallv is the initial velocityt is the time of motiong is acceleration due to gravity1300 = 43t + 0.5(9.8)t²
1300 = 43t + 4.9t²
4.9t² + 43t - 1300 = 0
solve the quadratic equation using formula method as shown below;
a = 4.9, b = 43, c = -1300
t = 12.48 seconds
Thus, the time taken for the object to travel the given height is determined as 12.48 seconds.
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Which of the following might be an example of a theory?
о
You develop an equation that successfully predicts the size of a crater give the size
of the meteor
You publish a paper analyzing the elements that make up a sample of a meteorite
о
You develop an idea about why the frequency of meteor impacts varies in a
consistent pattern over several decades of observation
You design a spacecraft that can land a meteor and drill into it to sample its make-up
Answers
Answer:
C
Explanation:
Because a theory isnt confirmed you are developing an idea about things based on little evidence
. Suppose that a positive charge is brought near a neutral, insulating piece of material. Is the positive charge attracted, repelled, or indifferent to the neutral object
Answers
Answer:
Positive charge is attracted to the neutral object.
Explanation:
Recall ; Like charges repel, unlike charges attract. This phrase simply means (positive (+) is attracted to negative (-ve) and vuc versa while both positive, positive and negative, negative charge repel.
For a neutral object. The quantity of positive charge equals the quantity of negative charges. This simply means a neutral object contains charges as well, which are usually scattered or randomly aligned.
Therefore, when a positive charge is brought near a neutral body, the order of alignment of the charges change, with the negative charge all moving towards the direction of the positively charged body and the positive charges in the neutral body aligning in the opposite direction.
The charge will be attracted.
Understanding the force between charges.
As you may know, opposite charges attract (and equal charges repel).
So, when you put a positive charge near a neutral material, all the negative charges in the material will move towards the surface of the material closer to the positive charge (and the positive charges in the material will move away).
Now the charge in the material is not homogeneous, so the positive charge will see a negatively charged surface near it, and it will be attracted to that surface.
Thus we can conclude that as a positive charge is brought near a neutral, insulating piece of material, the charge will be attracted towards it.
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PLEASE HELP please put you own deffinitions down
Answers
Answer:
prototype - a first model of something
obsolete - out of date
Unintended Consequence - outcomes of actions that weren't predicted and intended
Feedback - reactions to something from someone like a customer
While watching a movie a spaceship explodes and there is a loud bang and flash of light. What is wrong with this scene? Explain how you know using evidence and scientific reasoning from the lesson.
Answers
In 1994, a pumpkin with a mass of 449 kg was grown in Canada. Suppose you want to push a pumpkin with this mass along a smooth, horizontal ramp. You give the pumpkin a good push, only to find yourself sliding backwards at a speed of 4.0 m/s. How far will the pumpkin slide 3.0 s after the push? Assume your mass to be 60.0 kg.
Answers
After pushing the pumpkin hard, you find yourself reversing direction at a speed of 4.0 m/s. 3.0 seconds after being pushed, the pumpkin will slide 12 m. Assume you weigh 60.0 kg.
We can use the conservation of momentum to solve this problem. After the push, the momentum of the system is given by:
p = (449 kg + 60 kg) * v
where v is the speed of the pumpkin and you after the push. Since you end up sliding backward at 4.0 m/s, we have:
v = -4.0 m/s
Substituting this into the expression for momentum, we find:
p = (449 kg + 60 kg) * (-4.0 m/s) = -2036 kg·m/s
The negative sign indicates that the momentum of the system is in the opposite direction of your motion.
During the sliding motion, the net force on the system is given by:
Fnet = (449 kg + 60 kg) * g * sin(θ)
where g is the acceleration due to gravity (9.81 m/s^2) and θ is the angle of the ramp. Since the ramp is smooth and horizontal, θ = 0 and Fnet = 0. Therefore, there is no net force to change the momentum of the system.
Using the equation for motion with constant acceleration, we can find the distance the pumpkin slides in 3.0 seconds:
x = x0 + v0t + (1/2)at²
Since the initial speed of the pumpkin is -4.0 m/s and there is no net force acting on it, its speed remains constant during the slide. Therefore, v0 = -4.0 m/s and a = 0. Substituting these values, we find:
x = x0 + v0t = (-4.0 m/s) * (3.0 s) = -12 m
The negative sign indicates that the pumpkin slides in the opposite direction to your motion. Therefore, the pumpkin slides 12 meters backward (i.e., towards you) in 3.0 seconds after the push.
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Jibari walks 40.0 meters east in 120.0 seconds. He then walks 30.0 meters west in 60.0 seconds. What is his average velocity for the trip??
Answers
We divide the total distance travelled by the period of time to determine the average speed. By dividing the displacement by the time interval, we can determine the average velocity.
How do you calculate a trip's average speed?Average speed was measured by dividing the overall distances you travelled by the total time, whereas average velocity is determined by dividing your movement (a vectors pointing from the initial position toward your end position) by the whole time.
What is an illustration of average speed?For instance, someone travelling at an average speed over 40 miles split by 10 mins, meaning 1 mile per minute, is travelling twenty miles to the north and afterwards 20 miles south (60 mph).
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A horizontal force F is used to pull a 5 kg block across a floor at constant speed of 4 m/s. The frictional force between the block and the floor is 10 N. How much work is done by the force F in one minute?
Answers
The frictional force between the block and the floor is 10 N. 1800J work is done by the force F in one minute.
What does friction mean?surface resistance for relative motion, such as a body rolling or sliding, noun. the rubbing of one body's surface against another's. disagreement or conflict between people, nations, etc. brought about by contrasting opinions, desires, etc.
Why is it called friction?Friction refers to the friction that one surfaces or object encounters when moving in relation to another surface. Friction is a crucial force because without it, objects in motion cannot be stopped.
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An object experiences a force of 15.0 N for 12.0 s. What is its change in momentum?
A. 12.0 N.s
B. 180 N.s
C. 15.0 N.s
D. 1.30 N.s
Answers
Answer:
C. 15.0 N.s
Explanation:
What is its change in momentum?15.0 N.s12.0 N.s180 N.s1.30 N.s
The change in momentum of the object is 180 N.s, which is option B.
What is the momentum of an object?It is an attribute of a moving body that exists due to its mass and motion and is analogous to the product of the body's mass and velocity.
The change in momentum of an object is equal to the product of the force acting on the object and the time interval during which the force is applied.
Using the given values:
Force = 15.0 N
Time = 12.0 s
Change in momentum = Force x Time
Change in momentum = 15.0 N x 12.0 s
Change in momentum = 180 N.s
Therefore, the change in momentum of the object is 180 N.s.
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A student adds 5 grams of vinegar to 7 grams of baking soda in a sealed bag. Then she watches the bag inflate as a chemical
reaction occurs. Which of these amounts is a CORRECT prediction of the mass of the materials in the container after the reaction is
complete?
Answers
Answer:
The mass will stay the same if the bag stays sealed.
Explanation:
Read each question carefully. Show all your work for each part of the question. The parts within the question may not have equal weight. A satellite of mass mis orbiting Earth in a stable circular orbit of radius R. The mass and radius of Earth are Mg and Rg , respectively. Express your answers to parts (a), (b), and (c) the following in terms of m, R, ME, Rg , and physical constants, as appropriate.
(a) Derive an expression for the speed of the satellite in its orbit.
(b) Derive an expression for the total mechanical energy of the satellite-Earth system in its orbit.
(c) Derive an expression for the period of the satelliteâs orbit.
(d) The satellite is replaced with a similar satellite that has twice the mass. The new satellite is placed into the same orbit as the original satellite. Is the new satelliteâs orbital speed greater than, less than, or equal to the original satelliteâs orbital speed?
Answers
A satellite of mass mis orbiting Earth in a stable circular orbit of radius R, (a) Speed of satellite is v = sqrt(G x Mg/R). (b) total mechanical energy is E = KE + PE. (c) the period of the satellite as orbit is T = 2 x pi x sqrt(R^3 / (G x Mg)).
(a) The speed of the satellite in its orbit can be derived using Kepler's second law of planetary motion, which states that a planet or satellite's orbital speed is inversely proportional to the square root of the distance from the center of the planet or satellite to the center of the primary body. This can be expressed mathematically as:
v = sqrt(G x Mg / R)
where v is the orbital speed of the satellite, G is the gravitational constant, Mg is the mass of Earth, and R is the radius of the satellite's orbit.
(b) The total mechanical energy of the satellite-Earth system in its orbit can be calculated using the formula for kinetic energy and the formula for gravitational potential energy. The kinetic energy of the satellite is given by:-
= KE
= 1/2 x m x v^2
The satellite's gravitational P.E. determined by:
= PE
= -G x Mg x m / R
The total mechanical energy of the satellite-Earth system is the sum of the kinetic energy and gravitational potential energy, so:
= E
= KE + PE
= 1/2 x m x v^2 - G x Mg x m / R
(c) The period of the satellite's orbit is the time it takes for the satellite to complete one full orbit around Earth. This can be calculated using the formula:-
= T
= 2 x pi x sqrt (R^3 / (G x Mg))
where T is the period of the orbit, G is the gravitational constant, Mg is the mass of Earth, and R is the radius of the satellite's orbit.
(d) If the new satellite has twice the mass of the original satellite, then its kinetic energy will be four times greater, since KE is proportional to m. However, the gravitational potential energy of the new satellite will also be four times greater, since PE is proportional to m. Since the total mechanical energy of the satellite-Earth system is the sum of the kinetic and gravitational potential energy, the total mechanical energy of the new satellite-Earth system will be the same as the total mechanical energy of the original satellite-Earth system. Therefore, the new satellite's orbital speed will be the same as the original satellite's orbital speed.
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A ball is thrown upwards with initial velocity 20 m/s. After reaching maximum height, on the way down it strikes a bird which is 10 m above the ground. What is the velocity of the ball when it hits the bird?
Answers
I know acceleration would be -9.8 m/s^2 (to assume free fall), the initial velocity would be 20, and that the final position would be 10, but I don't know how to find the max height to then use to find the final velocity.
Just set this up as a quadratic function. I assume that we start from a height of zero, since you don't say.
h(t) = 20t - 4.9t^2
Now, you want to solve
20t - 4.9t^2 = 10
t = 0.583, 3.498
Since v=20-9.8t, that would make
v(3.498) = 20-9.8*3.498 = -14.28
You don't need to find the max height for this problem, but that occurs when v=0. So, h(2) = 20.4
Anyways goodluck!
Marco wants to ask Ava out on a school date. He is excited at the prospect of spending time with her but is nervous that she will reject him. What type of conflict is this? A. Approach-Avoidance B. Double Approach-Avoidance C. Avoidance-Avoidance D. Approach-Approach
Answers
The kind of conflict that Macro is facing is called Double Approach-Avoidance. Option B
What is a conflict?We have to know that we talk about a conflict when we do have doubts about the course of action that we would need to take. Thus there is a conflict when you are not sure that the path that you propose to take in a given case would be the right path that would bring the result that you are expecting to have and this would bring about the existence of some kind of doubts in the mind.
In this case; Marco wants to ask Ava out on a school date. He is excited at the prospect of spending time with her but is nervous that she will reject him. This would then arouse some kind of conflict in his mind and this is the kind of conflict that we are trying to describe here.
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What is the shortest wavelength of light that can be emitted by a hydrogen atom that has an initial configuration of 8p^1? Give your answer accurate to three significant figures.
Answers
The Bohr model of the hydrogen atom allows us to find that the transition with the shortest wavelength up to the level n = 8, has a response is:
λ = 92.4 nm
The spectrum of the hydrogen atom is explained by the Borhr model, where the energy of the atom is given by
\(E_n = - \frac{13.606}{n^2} \ [eV]\)
Where Eₙ is the energy, n is an integer, the constant is the energy of the base state of hydrogen expressed in electron-volts.
It's using Planck's equation and that the light speed is related to the frequency, we can find an expression for the transition between two levels.
E = h f
c = λ f
E = \(\frac{h c}{\lambda }\)
ΔE = \(E_{n' } - E_n\) n ’> n
Where h is the Plank constnat, c the light speed and λ the wavelength
It's combining the equations we find
\(\frac{1}{\lambda} = R_H ( \ \frac{1}{n_{i}^2 } - \frac{1}{n_f^2} \ )\)
where λ is the transition wavelength, \(R_H\) is the Rydberg constant
(\(R_H\) = 1.0997 10⁷ m⁻¹), n_f and n_i are the final and initial levels of the electron.
In this case, the transition is requested up to the level n = 8, the sublevel p does not influence the value of the transition for atoms with a single electron such as hydrogen.
To find which is the initial nevel we use that they ask for the shortest wavelength, for which the electron must leave the level; n_i = 1
\(\frac{1}{\lambda}\) = 1.0997 10⁷ ( \(\frac{1}{1^2 } - \frac{1}{8^2 }\) )
\(\frac{1}{\lambda}\) = 1.082517 10⁷
λ = 0.923772 10⁻⁷ m
λ = 9.23772 10⁻⁸ m
It is very common to give this wavelength in nanometers let's reduce the magnitude and use the criterion of three significant figures indicated
λ = 9.23772 10⁻⁸ m (\(\frac{10^9 nm}{1m}\))
λ = 92.4 nm
In conclusion, using the Bohr model of the hydrogen atom, we can find that the transition with the shortest wavelength for the novel n = 8, has a response of 92.4 nm
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I need a short answer ?
Answers
Answer:
Explanation:
7a) t = d/v = 100/45cos14.5 = 2.29533...= 2.30 s
7b) h = ½(9.81)(2.29533/2)² = 6.46056... = 6.45 m
or
h = (45sin14.5)² / (2(9.81)) = 6.47 m
which rounds to the same 6.5 m when limiting to the two significant digits of the initial velocity.
9. Cellular respiration occurs in what types of cells?
Answers
Answer:
Cellular respiration takes place in the cells of all organisms. It occurs in autotrophs such as plants as well as heterotrophs such as animals. Cellular respiration begins in the cytoplasm of cells. It is completed in mitochondria
Explanation:
Cellular respiration takes place in the cells of all organisms. It happening in autotrophs such as plantas as well as heterotrophs such as animals. Cellular respiration starts in the cytoplasm of cells.
It is finished in mitochondria.
1.Which among the following is measured using a Vernier Caliper?
[A] Dimensions
[B] Time
[C] Sound
[D] Temperature
Answers
Dimensions are measured using a Vernier Caliper (option A)
What is a Vernier Caliper?A device renowned for its accuracy in measuring the size of objects, the Vernier caliper functions with two jaws to hold an object steady as its scale offers readings. It can assess both external and internal measurements as well as depth with precision.
The Vernier caliper is made up of two main parts: the main scale and the vernier scale. The main scale is a graduated scale that is used to read the measurement in millimeters. The vernier scale is a smaller scale that is used to read the measurement in fractions of a millimeter.
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