An object traveling at a constant velocity has no net force. True or False

Answer:

B

Explanation:

Answer is B because the ball passes at 10 to 30

Carbon dioxide is closely linked to the greenhouse effect, as it is a primary greenhouse gas that traps heat in the atmosphere and contributes to climate change. Thus the correct option is B.

Since carbon dioxide (CO2) is one of the main greenhouse gases that cause global warming, it is directly related to the greenhouse effect. As a result of specific gases in the atmosphere trapping heat emitted from the Earth's surface, the greenhouse effect causes the temperature of the planet to rise.

Natural processes like respiration and volcanic activity, as well as human activities like burning fossil fuels and deforestation, emit CO2 into the atmosphere. Other gases that also contribute to the greenhouse effect include methane, nitrous oxide, and chlorofluorocarbons (CFCs), but CO2 is the most important and has the most influence on climate change.

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Answer:

The energy conversion is:

C) Chemical - - - - > Thermal.

Answer:

The correct answer is b: 96 m.

Explanation:

The total distance in the horizontal direction traveled by Danger Dog can be calculated using the following equation:

\( x_{f} = x_{0} + v_{0_{x}}t + \frac{1}{2}at^{2} \)   (1)

Where:

\( x_{f}\): is the final position in the horizontal direction =?                                      

\(x_{0}\): is the initial position in the horizontal direction = 0                                      

\( v_{0_{x}} \): is the initial velocity in the horizontal direction = 32 m/s

t: is the time

a: is the acceleration = 0 (he is accelerated only by gravity)

So, we need to find the time. We can find it as follows:

\( y_{f} = y_{0} + v_{0_{y}}t - \frac{1}{2}gt^{2} \)    (2)

Where:

\( y_{f}\): is the final position in the vertical direction = 0                                      

\(y_{0}\): is the initial position in the vertical direction = 45 m                                      

\( v_{0_{y}} \): is the initial velocity in the vertical direction = 0

g: is the acceleration due to gravity = 10 m/s²      

By solving equation (2) for "t" we have:

\( t = \sqrt{\frac{2(y_{0} - y_{f})}{g}} = \sqrt{\frac{2*45 m}{10 m/s^{2}}} = 3 s \)

Hence, the total distance traveled by Danger Dog in the x-direction is (equation 1):

\( x_{f} = 32 m/s*3 s = 96 m \)    

Therefore, the correct answer is b: 96 m.

I hope it helps you!

Answer:

40° (nice and warm)

Explanation:

40° is very cold (below freezing)

After time 2t, the wheel with constant angular acceleration will have turned through an angle of 100 rad (Option D).

Let's analyze the problem step by step. The given information states that the wheel starts from rest and undergoes a constant angular acceleration. We need to find the angle it will have turned after time 2t.

The formula to calculate the angle turned by a rotating object with constant angular acceleration is given by θ = ω₀t + (1/2)αt², where θ is the angle turned, ω₀ is the initial angular velocity, α is the angular acceleration, and t is the time.

In this case, the wheel starts from rest, so the initial angular velocity ω₀ is 0. The angle turned after time t is given as 25 rad, which means θ = 25 rad, and we need to find the angle turned after time 2t.

Plugging the given values into the formula, we have 25 rad = (1/2)αt². Solving for α, we find α = (50 rad) / t².

Now, we can use this value of α to find the angle turned after time 2t. Plugging α and t into the formula, we get θ = (1/2)(50 rad / t²)(2t)² = 100 rad.

Therefore, after time 2t, the wheel with constant angular acceleration will have turned through an angle of 100 rad (Option D).

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There is a transverse sinusoidal wave on a string that flows in a straightforward harmonic fashion and has an angular frequency that matches the wave. (Chose c.)

An energetic disturbance called a wave moves from one place to another. Every time a wave moves, energy is changed, regardless of the change. The substance through which a wave passes is known as the medium. Back and forth oscillations occur repeatedly in that medium.

A wave is a disruption or variation that progressively moves energy from one location in a medium to another. It could manifest as an elastomeric deformation or a shift in pressure, magnetic or electric field strength, electric potential, or temperature.

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The flight distance between St. Louis and Boston is 1677.5 Km

Speed is the distance travelled per unit. Mathematically, it can be expressed as:

Speed = distance / time

With the above formula, we can stain the flight distance between St. Louis and Boston. Details below.

The following data were obtained from the question:

The flight distance can be obtained as follow:

Speed = distance / time

Cross multiply

Distance = speed × time

Distance = 610 × 2.75

Distance = 1677.5 Km

Thus, flight distance between St. Louis and Boston is 1677.5 Km

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When a brick (brickA) is resting on a rough incline, the friction force acting on the brick along the incline depends on a few factors. First, let's discuss the forces acting on the brick (brickA). The weight of the brick acts vertically downward due to gravity, and this force can be represented as the weight vector. We can decompose the weight vector into two components: one parallel to the incline (weight_parallel) and one perpendicular to the incline (weight_perpendicular).

The friction force acting on the brick (brickA) along the incline is opposing the component of the weight vector parallel to the incline (weight_parallel). The force of friction is determined by the product of the normal force (which in this case is equal to weight_perpendicular) and the coefficient of friction between the brick and the incline (brickC).
Now, let's analyze the given options:
A. Equal to the weight of the brick - This is incorrect, as the friction force is only equal to the weight_parallel component, not the entire weight of the brick.
B. Less than the weight of the brick - This is correct. The friction force acting on the brick along the incline is opposing the weight parallel component, which is always less than the total weight of the brick.
C. Greater than the weight of the brick - This is incorrect, as the friction force is only acting against the weight parallel component and cannot be greater than the total weight of the brick.
D. Zero - This is incorrect. Since the brick is on a rough incline, there will be a friction force acting against the weight parallel component.
So, the correct answer is B. The friction force acting on the brick along the incline is less than the weight of the brick.

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Answer:

a &c

Explanation:

>3

Attraction between the molecules of a liquid and the temperature at which the liquid changes state is "Strong attractions mean the liquid boils at a higher temperature". The correct option is C

Temperature is a physical quantity which measures hotness and coldness of a body. Temperature measures the degree of vibration of molecule in a body. Temperature is measured in centigrade (°C), Fahrenheit (°F) and Kelvin (K) in which Kelvin (K) is a SI unit of temperature. Absolute scale of temperature means Kelvin scale of temperature.

relation between Kelvin(K) and centigrade (°C),

°C= K - 273.15

from equation, 273.15 K means 0 °C, which is freezing point of water (ice).

when we give temperature to the body, its molecule or atom absorbs thermal energy and vibrate about their mean position. Amplitude of vibration get increases as we go on increasing temperature and for higher temperature force of attraction between molecules gets weaker. Hence for higher temperature, due to weaken the force of attraction between molecule, solid goes into liquid state. and further increase in temperature liquid goes into gaseous state.

Liquid has stronger force of attraction than gas and weaker than solid. Strong force of attraction means high temperature should be given to break molecular bonds. Therefore Strong attractions mean the liquid boils at a higher temperature.

Hence option C is correct.

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The angular momentum immediately before and after the collision is equal. The rotational kinetic energy before the collision is greater than the rotational kinetic energy after the collision.

When a body is rotating in a plane about a center, the energy possessed by the body is known as rotational kinetic energy.

Angular momentum is the momentum of a body having circular motion.

According to the law of conservation of angular momentum, the momentum remains conserved before and after the collision.

In the given sphere rod system, after the sphere (m0) sticks to the rod(2m0), the mass increases to 3m0 due to which the moment of inertia is increased but the speed is decreased.

Rotational Kinetic Energy =\(\frac{1}{2}\)Iω²

Thus, the angular momentum immediately before and after the collision is equal. The rotational kinetic energy before the collision is greater than the rotational kinetic energy after the collision.

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Answer:

i think it's 1400

Explanation:

w = Force x displacement

w = 400 x 3.5

Answer:

c: -7.25

Explanation:

Here we can use the equation v=u+at

Where v is the final velocity

u is the initial velocity

a is acceleration

and t is time

41.55=79.33+a(5.21)

41.55-79.33=5.21a

-37.78=5.21a

a=-7.25 m/\(s^2\)

The negative sign is due to the fact that they are slowing down

It is observed that sedimentary rock was generated by compacting sedimentary layers; a meteorite struck Earth after the sedimentary layers developed. Option D is correct.

Space is captured by satellite camera systems in a variety of electromagnetic frequencies.

A satellite imager, in fact, is a detector equipped with a sensor that actively scans the changing surface of the Earth, registering the signal generated or reflected by the item or the surrounding region.

This image of northern Algeria was captured by a satellite camera in orbit, and it shows an impact crater, sedimentary rock strata, and a stream channel pouring out of the crater.

Algeria is located at the northernmost tip of the African continent. Algeria's terrain is dominated by the Sahara Desert and two mountain ranges.

It is observed that sedimentary rock was generated by compacting sedimentary layers; a meteorite struck Earth after the sedimentary layers developed; and water erosion formed a stream channel from the meteorite's impact zone.

Hence,option D is correct.

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Using the aforementioned equation for v and the corresponding expression for y(x), one may determine the speed of the bag at any point along the ramp.

The potential energy of the bag at every location x can be written as follows using the expression given for y(x): U(x) is equal to mgy(x) = 8 kg * 9.81 m/s2 * 0.32 e(x)

The sack has no potential energy at the bottom of the ramp, but all of its initial potential energy has been transformed into kinetic energy. Thus, the sack's total energy at the bottom of the ramp is equal to its original potential energy:

Mgh = U(0) + K(0) mgy(0) (1/2)mv2

To solve for v, we obtain:

sqrt(2gh- 2gy(0))/sqrt (m)

Inputting the values provided yields:

1.452 m/s = sqrt(29.810.32 - 29.810.32*e0)/sqrt(8)

As a result, using the aforementioned equation for v and the corresponding expression for y(x), one may determine the speed of the bag at any point along the ramp.

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I'm gonna have to guess B) Automation sorry if I get it incorrect

Answer:

0.119 s is the correct answer to this question.

Explanation:

As mentioned in the question

U=3.89\ m/s

a=-1.44\ m/s^2

S=4.8\ m

Consider the final speed of the softball covering the distance of 4.8m is v

Now using the equation

\(v^2=U^2+2aS\)

Putting the value of U, A, S in the previous equation we get

\(V^2=3.89^2-2\times 1.44\times 4.8\\V=3.7\ m/s\\\)

Now again using the equation

v=U+at

where U=intial velocity, t= time

Substituting the value of v, U, a

\(3.7=3.89-1.44\times t\\t=0.119\ s\\\)

Hence the slide time is 0.119 s

Answer:4 and 5

Explanation:it you add 1+3 and 2+3 it is 4 and 5

The correct order of increasing impedance is:

C. PZT, gel, skin, matching layer

Impedance is a measure of the opposition to the flow of sound waves in a medium. It depends on the density and speed of sound in the material. In the given options, the order of increasing impedance can be determined by considering the properties of the materials involved.

PZT (lead zirconate titanate) has a higher impedance than gel, skin, and the matching layer. PZT is a piezoelectric material commonly used in ultrasound transducers and has a higher density and speed of sound, leading to higher impedance.

Gel has a lower impedance compared to PZT but higher impedance than skin and the matching layer. Gel is used as a coupling medium between the transducer and the skin to enhance acoustic coupling and minimize impedance mismatch.

Skin has a lower impedance than both gel and the matching layer. It is the outermost layer and acts as an interface between the transducer and the biological tissue.

The matching layer has the lowest impedance among the given options. It is designed to match the impedance of the PZT to the impedance of the tissue being imaged, facilitating efficient sound transmission.

Therefore, the correct order is C.

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The predicted frequency of defective calculators can be calculated using the formula:

Predicted Frequency = (Probability of Defect) x (Total Number of Calculators)

In this case, the company claimed a probability of 1% per 1000 calculators. Therefore, the probability of a defective calculator is 0.01 (1% expressed as a decimal).

The total number of calculators tested by Gustavo was 1000.

Substituting these values into the formula, we have:

Predicted Frequency = 0.01 x 1000 = 10

The predicted frequency of defective calculators is 10. This means that, according to the company's claim of a 1% probability, it was expected that out of 1000 calculators, approximately 10 of them would be defective. However, Gustavo found 15 defective calculators, which indicates a slightly higher rate of defects compared to the company's prediction.

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Answer:

The answer would be the last option (the one with the arrow pointing sideways)

Explanation:

The arrow lost it's acceleration and is starting to go downwards but it isn't a straight slope down

Main answer: The magnetic field between the hot and neutral wires supplying DC power to the light rail commuter train is 0.0053 T.

The magnetic field between two parallel conductors can be calculated using the equation B = (μ0*I)/(2π*r), where B is the magnetic field, μ0 is the permeability of free space, I is the current, and r is the distance between the wires. Plugging in the given values, we get:

B = (4π x 10^-7 T*m/A)*(800 A)/(2π*0.75 m)

B = 0.0053 T

Therefore, the magnetic field between the hot and neutral wires supplying DC power to the light rail commuter train is 0.0053 T.

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The wave interaction that can cause a spoon to appear broken in a glass of water is called refraction.

Refraction occurs when a wave, such as light, passes from one medium to another with a different density or refractive index. When light waves travel from air into water, for example, they undergo a change in direction due to the change in speed caused by the difference in optical properties between the two mediums.

In the case of the spoon in a glass of water, the light waves coming from the spoon encounter the air-water interface. As they pass from air into water, they undergo refraction, causing a change in their direction. This change in direction can create an optical illusion where the spoon appears to be bent or broken at the water's surface.

This phenomenon is a result of the bending of light rays as they pass through different mediums with different refractive indices, and it is a common example of how refraction can distort the perception of objects when viewed through different mediums.

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The capacitor must have a value of approximately 1.05 μF to ensure that the current and voltage are in phase in this circuit.

To ensure that the current and voltage in the circuit are in phase, the reactance of the inductor and the reactance of the capacitor must cancel each other out. The reactance of an inductor (XL) is given by the formula:

XL = 2πfL

where f is the frequency of the source voltage and L is the inductance of the coil.

In this case, we have an inductor with an inductance of 130 mH (or 0.13 H) and a source voltage frequency of 1360 Hz. Therefore, the reactance of the inductor (XL) is:

XL = 2π * 1360 * 0.13
≈ 1069.37 Ω

For the current and voltage to be in phase, the reactance of the inductor (XL) and the reactance of the capacitor (XC) must be equal in magnitude but opposite in sign.

The reactance of a capacitor (XC) is given by the formula:

XC = 1 / (2πfC)

where C is the capacitance of the capacitor.

To cancel out the reactance of the inductor, we need XC to have a magnitude of approximately 1069.37 Ω. Setting XC equal to the magnitude of XL:

XC = 1069.37 Ω

Plugging in the given frequency of 1360 Hz, we can solve for C:

1069.37 Ω = 1 / (2π * 1360 * C)

Simplifying the equation:

C = 1 / (2π * 1360 * 1069.37)
≈ 1.05 μF

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240 seconds

Explanation:

If he walked to A and took 80 Seconds it should be the same amount of distance to B and C

By using the orbital period equation we will find that the orbital radius is r = 4.29*10^11 m

This would be the time that a given body does a complete revolution in its orbit.

It can be written as:

\(T = \sqrt{\frac{4*\pi ^2*r^3}{G*M} }\)

Where:

Rewriting the equation for the radius we get:

\(T = \sqrt{\frac{4*\pi ^2*r^3}{G*M} }\\\\r = \sqrt[3]{ \frac{T^2*G*M}{4*\pi ^2} }\)

Where T = 7.5 years = 7.5*(3.154*10^7 s) = 2.3655*10^8 s

Replacing the values in the equation we get:

\(r = \sqrt[3]{ \frac{(2.3655*10^8 s)^2*(6.67*10^{-11} m^3/(kg*s^2))*(1.989*10^{30} kg)}{4*3.14 ^2} } = 4.29*10^{11 }m\)

So the orbital radius is 4.29*10^11 m

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Answer:

The average velocity is 7.5 km/h

Explanation:

Were Gonna convert minutes to hours

12 minutes = 12/60  hours = 0.2 hours

Now we estimate the average velocity of the distance traveled over this time

1.5 / 0.2 km/h = 7.5 km/h

Answer:

Mechanical weathering is the physical breakdown of rock into smaller pieces. Chemical weathering is the breakdown of rock by chemical processes.

Explanation:

Mechanical weathering (also called physical weathering) breaks rock into smaller pieces. These smaller pieces are just like the bigger rock, just smaller. That means the rock has changed physically without changing its composition. The smaller pieces have the same minerals, in just the same proportions as the original rock.

Chemical weathering is the other important type of weathering. Chemical weathering is different from mechanical weathering because the rock changes, not just in size of pieces, but in composition Chemical weathering works through chemical reactions that cause changes in the minerals.

Answer: Cross-cutting features are always younger than the surrounding rock.

When material erodes before sediment is deposited on it, a geologic gap results.

Explanation:

The options include:

1. An unconformity is created when lava pours out on Earth’s surface.

2. Faults are the result of volcanic activity.

3. Intrusions and extrusions are sedimentary formations.

4. Cross-cutting features are always younger than the surrounding rock.

5. When material erodes before sediment is deposited on it, a geologic gap results.

The law of superposition simply states that when there is a layers of rocks, we would see that the younger layers will lie and be on top of the layers that are older.

Other tools that can help scientist with relative dating are:

• Cross-cutting features are always younger than the surrounding rock.

• When material erodes before sediment is deposited on it, a geologic gap results.

Explanation:

It's on Edge