Velocity of an object in projectile motion always increase
True
False​

Answer:

No forces acted on the book correct me if wrong please

The net force that must be applied to Jocelyn is 139 Newton.

The net force acting on Jocelyn during the death spiral can be determined using the equation:

F = m * a

where F is the net force, m is her mass (47.3 kg), and a is her centripetal acceleration.

To find the centripetal acceleration, we can use the equation:

a = v^2 / r

where v is her velocity and r is the radius of rotation.

We know that Jocelyn completes one rotation every 1.13 seconds, so we can calculate her velocity:

v = 2 * pi * r / T

where T is the time for one rotation

Plugging in the known values:

v = 2 * pi * 0.915 m / 1.13 s

v = 5.09

Now we can substitute the value of v into the centripetal acceleration equation:

a = v^2 / r

a = 5.09² / 0.915

a = 28.3

F = ma

F = 47.3 × 28.3

F = 1339 Newton

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Answer:

time is a gap or interval between any two events

Answer:

B. a plausible answer to a scientific question that is used to guide research

Explanation:

I believe this is the best option that can be used to answer your question. The other options do not support the definition of a scientific theory.

Hope this helps! Please let me know if you need more help, or if you think my answer is incorrect. Brainliest would be MUCH appreciated. Have a great day!

Stay Brainy!

−Kallmekrish

Answer:

0.3 newtons

Explanation:

If the coefficient of kinetic friction between a crate and the floor is 0.20, then the fore needed to slide a 92 kg crate uniformly across the floor would be 180.504 N

Friction is a type of force that resists or prevents the relative motion of two physical objects when their surfaces come in contact.

The friction force prevents any two surfaces of objects from easily sliding over each other or slipping across one another. It depends upon the force applied to the object.

As given in the problem If the coefficient of kinetic friction between a crate and the floor is 0.20

The force needed = μN

where μ is the coefficient of the kinetic friction

μ =0.2

N is the normal force

N = mg

N = 92×9.81 N

Force needed to slide = 0.20× 92×9.81

                                     =180.504 N

Thus, The force needed to slide a 92 kg crate uniformly across the floor would be 180.504 N

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Answer:

The appropriate solution is "0.597 mm".

Explanation:

Given that:

Wavelength,

\(\lambda = 519 \ nm\)

or,

  \(=519\times 10^{-9}\)

Distance,

\(D=4.6 \ m\)

Separated by,

\(\beta = 4.0 \ mm\)

or,

   \(=4.0\times 10^{-3}\)

As we know,

⇒ \(\beta=\frac{\lambda D}{d}\)

or,

The separation of two slits will be:

⇒ \(d=\frac{\lambda D}{\beta}\)

By putting the values, we get

       \(=\frac{(519\times 10^{-9})(4.6)}{4.0\times 10^{-3}}\)

       \(=5.97\times 10^{-4}\)

or,

       \(=0.597 \ mm\)

Since focal length cannot be negative for a converging lens, we take the positive value: f ≈ 41 cm Option C

To determine the focal length of the lens, we can use the lens formula, which relates the object distance (u), image distance (v), and focal length (f) of a lens. The lens formula is given by:

1/f = 1/v - 1/u

In this case, the object distance (u) is 25 cm and the image distance (v) is 64 cm. We can substitute these values into the lens formula to solve for the focal length:

1/f = 1/v - 1/u

1/f = 1/64 cm - 1/25 cm

To simplify the equation, we can find a common denominator:

1/f = (25 - 64) / (64 * 25)

1/f = -39 / (64 * 25)

Now, we can invert both sides of the equation to solve for the focal length:

f = (64 * 25) / -39

f ≈ -41.03 cm

Since focal length cannot be negative for a converging lens, we take the positive value:

f ≈ 41 cm

Therefore, the correct answer is option C) 41 cm.

It's important to note that in the lens formula, distances are measured with respect to the lens, with positive values indicating distances on the opposite side of the incident light. The negative value obtained for the focal length indicates that the lens is a converging lens, as expected. Option C

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The sample of Platinum-182 that will remain after 6 half-lives is 1.875 grams

Using the formula of half-life,

Half-life: This is the time taken for half the sample of a radioactive substance to disintegrate.

⇒ Formula

⇒ Where:

From the question,

⇒ Given:

⇒ Substitute these values into equation 1

Hence, The sample of Platinum-182 that will remain after 6 half-lives is 1.875 grams

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ANSWER

B. 1.78 x 10⁷ J

EXPLANATION

Given:

• The power of the washer, P₁ = 450 W

• The power of the dryer, P₂ = 3000 W

• The time needed to wash one load of clothes, t₁ = 1 hour

• The time needed to dry those clothes, t₂ = 1.5 hours

Energy is the product of power and time,

If the power is given in watts, we have to convert the time to seconds, so that the energy is in Joules. Knowing that 1 hour has 3600 seconds,

So the energy needed to wash the clothes is,

And the energy needed to dry them,

So, the total energy needed for the whole cycle is,

Hence, the energy needed to wash the clothes for 1 hour and dry them for 1.5 hours is 1.78 x 10⁷ J.

Answer:

Based on the information provided, the lightbulb lights when the loop rotates because the movement of the wire in an electric or magnetic field causes electrons in the wire to move and become either mechanical energy or an electric current. This energy causes the light to glow. The energy change involved is the conversion of electrical or mechanical energy used to rotate the loop into either light or electrical energy

Explanation:

SeaWorld is a chain of theme parks and oceanariums that showcase marine life through educational exhibits, live shows, and thrilling rides. While it has faced criticism for its treatment of animals, SeaWorld has made changes to prioritize conservation and phased out its orca breeding program.

SeaWorld is a chain of theme parks and oceanariums that primarily focuses on marine life and entertainment. The company operates various parks across the United States, including SeaWorld parks in Orlando, San Diego, and San Antonio, as well as Busch Gardens parks in Tampa and Williamsburg. SeaWorld offers a combination of educational exhibits, live shows, and thrilling rides, with a special emphasis on marine animals such as dolphins, whales, sea lions, penguins, and sharks.

SeaWorld parks provide visitors with opportunities to observe and interact with marine creatures up close, while also offering educational programs that aim to raise awareness about marine conservation and preservation. The parks feature captivating shows featuring trained animals, where they perform impressive behaviors and stunts, showcasing their intelligence and natural abilities.

Over the years, SeaWorld has faced criticism from animal rights activists and environmentalists, who argue that the captivity and use of marine animals for entertainment purposes is unethical and harmful to the animals' well-being. These concerns have led to significant changes in the company's practices, including the phasing out of its orca breeding program and the introduction of more educational and conservation-focused initiatives.

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Answer:

Decrease the mass.

Explanation:

By Newton's Second Law we know that net force exerted on a given system equals the rate of change of linear momentum (\(P\)) in time.

\(F = \frac{dP}{dt}\) (Eq. 1)

When mass of the system has a constant mass, this net force (\(F\)) is reduced to its mass (\(m\)) multiplied by acceleration (\(a\)):

\(F = m\cdot a\) (Eq. 2)

If we keep net force exerted on system constant, then a decrease on mass is compensated by an increase in acceleration. Hence, correct answer is: Decrease the mass.

The pressure of the gas in the deodorant can when it is heated to 900 K is 9 atm.

Gay-Lussac's law states that the pressure exerted by a given quantity of gas varies directly with the absolute temperature of the gas.

It is expressed as;

P₁/T₁ = P₂/T₂

From the data:

We substitute our values into the expression above and solve for final pressure.

P₁/T₁ = P₂/T₂

P₁T₂ = P₂T₁

P₂ = P₁T₂  / T₁

P₂ = ( 3 atm × 900 K ) / 300 K

P₂ = 9.0 atm

Therefore, the final pressure is 9.0 atm.

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Answer:

M g = M a = a (9 - 7) kg      with the two masses going in different directions

(7 + 9) kg * g = a * 2 kg       2 kg effective in prducing acceleration

a = 16 / 2 * g = 9.8 m/s^2 / 8 = 1.23 m/s^2

M1 a = T - M1 * g        T producing upward acceleration of 1.23 m/s^2

T = 7 (a + g) = 7 * 11 = 77 N

Check:

M2 a =  M2 * g - T          M2 producing downward acceleration

T = M2 (g - a) = 9 * (9.8 - 1.23) = 77 N

Answer:

Because soft iron cores have excellent magnetic permeability, which focuses magnetic lines of force and reduces energy loss.

So soft iron has a high permeability, and that allows full coupling of magnetic flux from the main coil to the secondary coil in the core of a transformer

The correct answer that contains the correct number of significant digits for the given measurements is:

All the digits known with certainty that is those indicated by the markings on the measuring instrument and the first uncertain, or estimated, digit are referred to as the significant figures of a measured quantity which is one digit past the smallest marking on the measuring device.

For the given data, the correct answers are given below:

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Answer:

Explanation:

a. The compact car going 70 MPH has more kinetic energy than the tractor trailer going 15 MPH. Kinetic energy is proportional to the square of the velocity, so even though the tractor trailer may have more mass, the higher velocity of the compact car results in greater kinetic energy.

b. The SUV and the pickup truck have the same kinetic energy since they have the same mass and velocity.

c. The compact car going 45 MPH has the most kinetic energy since it has the highest velocity out of the three vehicles. The SUV going 35 MPH has less kinetic energy, and the school bus going 15 MPH has the least kinetic energy.

The pilot's total velocity is 116.3 knots in the direction of 62.3⁰.

The pilot's total velocity is calculated by applying the principle of relative velocity.

The total velocity is also the resultant velocity and the magnitude of the pilot's total velocity is calculated by applying Pythagoras theorem as follows;

R = √ (V₁² + V₂²)

R =  √ (54² + 103²)

R = 116.3 knots

The direction of the velocity vector is calculated as follows;

tan θ = (103 knots) / (54 knots)

θ = tan⁻¹ (103/54)

θ = 62.3⁰

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Answer:

a) tires rubbing, b) the weight has a component parallel to the floor

c) he child's back support, d)  The tension of the rope and weight

Explanation:

In this exercise, we are asked to indicate the origin of the forces for the centripetal movement  parallel to the rope,  e) gravitational force

a) When a car turns, the centripetal force has two origins

* The tires rubbing against the road

* If the road has a lean angle, the component of the weight directed towards the center of the circle also contributes to the centripetal force.

b) the child in general has some degree of inclination with respect to the post, for which the weight has a component parallel to the floor that is responsible for the centripetal movement of the system

c) The bench rotates together with the carousel, so the child's back support is the response to the centripetal force

d) The tension of the rope has two components: the component perpendicular to the movement and the component of the weight (parallel to the rope) the difference of these two forces is the centripetal force

e) The gravitational force of the sun on the earth is what creates the centripetal motion

According to the question the magnetic field is -3.925 x 10⁻⁶ T.

A magnetic field is an invisible force field created by a magnet or a moving electric charge. This field is made up of magnetic lines of force that move outward from the magnet or electric charge and can interact with other magnets and electric charges. The magnitude and direction of the force can be determined by measuring the strength and direction of the magnetic field.

The magnetic field can be determined using the equation:
F = qv x B,
where F is the force, q is the particle's charge, v is its velocity, and B is the magnetic field.
We can rearrange this equation to solve for B:
B = F / (qv)
In our case, the charge of the particle is 80 μC, its velocity is 20iˆ km/s, and the force is given by F = ma = (10g)(-9.8jˆ m/s²) = -98 mN.
Substituting these values into the equation, we find that the magnetic field is:
B = -98 mN / (80 μC x (20iˆ km/s)) = -3.925 x 10⁻⁶ T.

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According to the information, the mass of the rock is found to be 2 kg.

Potential energy may be defined as a type of stored energy that depends upon the relative position of various parts of a system. This energy is held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors.

According to the question, the potential energy is calculated with the help of the following formula:

where, P.E = 1960 J, g = 9.8 m/sec, and height = 100 m, mass = ?

mass = P.E / g × h = 1960/980 = 2 kg.

Therefore, the mass of the rock is found to be 2 kg.

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Answer:

d. they will always agree

Explanation:

although they are all on the same topic the writer will more likely agree on the same topic as they have similar ideas but different outputs on the subject.

sorry if this is wrong.

Pressure builds under the surface of Earth, causing mountains to form.The correct answer is option D.

Uplift refers to the geological process that elevates the Earth's surface, resulting in the formation of mountains. This process is primarily driven by tectonic forces, including the movement and collision of Earth's lithospheric plates.

When two plates converge, immense pressure builds up beneath the surface, causing the crust to buckle and fold. This deformation leads to the formation of mountains, as rocks are pushed upward and displaced vertically.

As the uplift process continues over millions of years, mountains gradually take shape. Erosion and weathering play significant roles in shaping their features, but it is the initial uplift that initiates the formation of mountains.

As the Earth's surface is elevated, a wide range of landforms can emerge, including rugged peaks, deep valleys, and steep slopes.

Uplift has a profound impact on the Earth's surface and ecosystems. Mountains alter local climates, influencing precipitation patterns and creating variations in temperature and wind patterns.

Therefore, uplift plays a crucial role in shaping the Earth's surface and influencing various geological, biological, and climatic processes.

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Modern LCD and LED screens have taken the role of the Cathode Ray Tubes (CRTs) that were once used in televisions. The magnitude of the electric field (in V/m) in the region between the plates is 1.88 x 10^6 V/m.

The CRT is made up of an electron gun that produces a beam of electrons that are then directed by an electric field towards a fluorescent screen at the end of the tube. The electric field between the plates of a CRT (Cathode Ray Tube) has to be found. The plates are 1.30 cm apart and there is a potential difference of 24.5 kV between the plates. Here’s how to find the electric field: The formula to calculate the electric field between the plates is: `E = V/d`, where E is the electric field.

Substitute the given values in the formula: E = V/d = 24.5 kV/0.013 m= 1.88 x 10^6 V/m. Therefore, the magnitude of the electric field (in V/m) in the region between the plates is 1.88 x 10^6 V/m.

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Answer: 22 hours 15 minutes

Explanation: The calculated flying distance from New York City to Dallas is equal to 1371 miles which is equal to 2206 km. If you want to go by car, the driving distance between New York City and Dallas is 2492.32 km. If you ride your car with an average speed of 112 kilometers/hour (70 miles/h), travel time will be 22 hours 15 minutes.

Answer:

Explanation:

F = m*a = (0.5)*15 = 7.5 N

Answer:

I think he should move the purple car to the right. good luck

Answer:

The instantaneous velocity of the rocket the moment before it hits the ground is 50 m/s.

Explanation:

Given;

initial velocity of the rocket, u = 50 m/s

Determine the maximum height reached by the rocket.

at maximum height reached by the rocket, the final velocity, v = 0

v² = u² -2gh

0 = 50² - 2(9.8)h

19.6h = 2500

h = 2500 / 19.6

h = 127.55 m

At maximum height, the time to reach ground is given by;

h = ¹/₂gt²

\(t = \sqrt{\frac{2h}{g} } \\\\t = \sqrt{\frac{2*127.55}{9.8} }\\\\ t = 5.1 \ s\)

Before the rocket hits the ground the final velocity will be maximum;

v = u + gt

v = 0 + 9.8 x 5.1

v = 50 m/s

Therefore, the instantaneous velocity of the rocket the moment before it hits the ground is 50 m/s.

Answer:

where?

Explanation:

ill edit my answer when see it