A body of mass m when released from rest from a height h, hits the ground with speed sqrt gh . Find work done by resistive force.
Pleaseeeee hellop

Answer:

B

Explanation:

Explanation:

what is asked give brief explanation about question

Step #1: Learn what "displacement" means.

Step #2: Learn what "velocity" means.

Hi there!

Because of Newton's Third Law, the force exerted by the sprinter on the track is equal and opposite to the force exerted by the track on the sprinter.

We can begin by calculating the sprinter's acceleration. Use the equation:

vf² = vi² + 2ad

Rearrange for acceleration:

(vf² - vi²)/2d = a

Plug in values:

(8² - 2²)/2(2.5) = 60/5 = 12 m/s²

Calculate the force:

∑F = ma

∑F = 60 × 12 = 720 N. This is the amount of force exerted by the track on the sprinter in causing him to accelerate forward.

Thus, the backward force exerted by the sprinter on the track is the opposite, or -720 N.

The ship travels with a velocity of 15 km/h within 2 hours. The distance travelled is the velocity times the time taken that is 30 km to the north.

Velocity is a physical quantity measuring the distance travelled by an object per unit time. Velocity is the rate of speed and it is a vector quantity having both magnitude and direction. The unit of velocity can be m/s, km/h, ft/s etc.

Velocity is the ratio of the change in distance to the change in time. The change in distance is sometimes called the displacement.

then velocity  = displacement / time

Given that velocity = 15 km/h

time taken = 2 hours

then displacement = velocity × time

= 15 × 2 = 30 Km

Therefore, the displacement of the ship is 30 km to the north.

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equilibrium = 1/1

50 N/x = 1/1

x = 1/1 × 50 N

x = 50 N (B)

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Answer: D 100N

Explanation: Subtract the length of the beam by the pivot and multiply the weight by it.

Answer:

[tex]P.E=mgh \\ = 8kg \times 9.81m {s}^{ - 2} \times 10m = 784J[/tex]

Answer:

The lens can sharpen the curvature of its front and back surfaces, increasing its focusing power.

Explanation:

A lens can change its refractive power through sharpening of the curvature of its front and back surfaces, thereby increasing its focusing power.

The optical power of a lens is the degree to which the lens is able to converge or diverge light.

The optical power of a lens is measured in Diopters, and obtained by taking the reciprocal of the focal length in meters.

P = 1/F

A lens can change its refractive power through sharpening of the curvature of its front and back surfaces, thereby increasing its focusing power.

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Answer:

i think that it is b but I could be wrong

Answer:

20 minutes

Explanation:

Create a proportion.

x = time for 23 miles of travel

70 miles/hr = 23 miles/ x

--- Cross Multiply

70x = 23  --- Divide 70 on both sides

x = 0.32857 hrs....

multiply your value of "x" by 60 min/hr in order to convert to minutes

0.32857 hrs * 60min/1hr

hr(s) cancels out

x = 19.7143... ~ 20 mins

Hope this helps you

The coefficient of friction on the box sliding to the left is 0.3.

The given parameters;

The acceleration of the box is calculated as follows;

[tex]F = ma\\\\a = \frac{36}{12.2} \\\\a = 2.95 \ m/s^2[/tex]

The coefficient of friction on the box is calculated as follows;

[tex]\mu_k = \frac{a}{g} \\\\\mu_k = \frac{2.95}{9.8} \\\\\mu_k = 0.3[/tex]

Thus, the coefficient of friction on the box is 0.3.

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Answer:

122.5 meters

Explanation:

We have the third equation of motion:

[tex]\boxed{\mathsf{v^2=u^2+2aS}}[/tex]

Here, the particle is a flare.

It's initial velocity is 49 m/ s and the final will be zero, that's 'cause the particle comes to a standstill upon reaching its maximum, in case of motion under gravity.

a will be the acceleration due to gravity = 9.8 m/ s²

So, here are the terms we've got for the third eqn. of motion:

Now, the term we've got to find out is the height reached by the flare, i. e., S.

=> v² = u² + 2aS

=> (0)² = (49)² + 2×(-9.8)×S

=> 0 = 49×49 - 2×9.8×S

=> 2×9.8×S = 49×49

[tex]\implies \mathsf{S=\frac{49\times 49}{2\times9.8} }[/tex]

=> S = [tex]\frac{245}{2}[/tex]

And, S is the maximum height the flare covers, so the answer is 122. 5 meters

Answer:

The force formula is defined by Newton's second law of motion: Force exerted by an object equals mass times acceleration of that object: F = m×a( force = mass×area)

The combination of a particle's mass and velocity produces momentum. Momentum is a vector quantity that has both magnitude and direction. The force exerted on a particle is equated to the time rate of change of momentum by Isaac Newton's second equation of motion.

First law of Newton : According to Newton's first law of motion, if a body is at rest or moving in a straight path at a constant speed, it will stay in that state or continue to move in that direction unless it is acted upon by an outside force.

Second law of Newton : According to Newton's second rule of motion, a body's rate of momentum change is inversely proportional to the force acting on it, and momentum changes occur in the direction of the net applied force.

Third law of Newton : Newton's third law of motion states that there is always an equal and opposite reaction to every action.

In order to accomplish work and to produce heat and light, energy must be transferred to a body or to a physical system. Energy is the quantitative attribute that does this.

A push or pull that an object experiences as a result of its interactions with its environment is known as a force.

Dust and smoke rising in the atmosphere as a result of an asteroid impact hinder sunlight from reaching our planet, resulting in a decrease in global temperature. Many living beings could die as a result of this incident. A small city might be destroyed if an asteroid the size of an apartment strikes Earth. A 20-story building-sized asteroid might wipe out a small nation if it were to strike Earth.

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Answer:

When cutting, lay the thumb and forefinger flat on the food you are cutting to hold it firmly in position

Explanation:

Because it may cut you so avoid it

The easiest way to calculate the density of dry air is by applying the ideal gas law. The ideal gas law expresses density as a function of temperature and pressure. Also, just like all gas laws, it is an estimate.

Answer:

A.protons and neutrons in the nucleus.

Answer:

2.9 ok ezzzzzzzzzzzzzzzzzzzzzzz

Explanation:

the magnitude of the resultant force =

√(68.9² + 85.4²)

=√(4,747.21 + 7,293.16)

=√12,040.37

= 109.7 N

»Sue's style feet (north) = 68.9N

»Jenny style feet (East) = 85.4N

So, the resultant force on the ball is

= √(68.9² + 85.4²)

= √(4,747.21 + 7,293.16)

= √(12,040.37)

≈ 109.72N✅

~Physics#2

let's find the acceleration first :

now, we know that :

hence, mass = 6kg

Answer:

Linear momentum is defined as the product of a system's mass multiplied by its velocity.

Answer:

0.1 miles

Explanation:

1mile/10 minutes

to get some miles/1 minute:

since you divided the 10 minutes to get 1 minute you also divide the 1 mile by 10 to get the number of miles per minutes

ei 1/10 = 0.1 miles

Answer:

the free-body diagram shows the vectors for all the forces acting on the body. The resultant vector found by summing all the individual vectors represents the net force. Since F = ma, the acceleration vector will point in the same direction as the net force, with a magnitude of F / m

Explanation:

ewan ko kung tama

Speed, distance and time can be calculated using a magic triangle. D (the distance) goes in the top of the triangle, S (speed) goes in the bottom left of the triangle and T (time) goes in the bottom right of the triangle.

Answer:

I THINK it’s A

Explanation:

Because all the other answers don’t make sense.

Answer:

The main driver of climate change is the greenhouse effect. Some gases in the Earth's atmosphere