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3 years ago

9

Anna applies a force of 19.5 newtons to push a book placed on a table. If the normal force of the book is 51.7 newtons, what is

the coefficient of kinetic friction?

1 answer:

GarryVolchara [31]3 years ago

6 0

that would be given by

[email protected]

@ representing coefficient of kinetic friction.

thus 19.5/51.7 = 0.377

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12 seconds after starting from rest a frewly falling cantaloupe has a speed of

adoni [48]

Answer:

<em>The cantaloupe has a speed of 117.6 m/s</em>

Explanation:

<u>Free Fall Motion</u>

It occurs when an object falls under the sole influence of gravity. Any object that is being acted upon solely by the force of gravity is said to be in a state of free fall. Free-falling objects do not face air resistance.

If an object is dropped from rest in a free-falling motion, it falls with a constant acceleration called the acceleration of gravity, which value is $g = 9.8 m/s^2$ .

The final velocity of a free-falling object after a time t is given by:

vf=g.t

The cantaloupe has been dropped from rest. We are required to find the speed after t=12 seconds.

Calculate the final speed:

vf=9.8 * 12 = 117.6 m/s

The cantaloupe has a speed of 117.6 m/s

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2 years ago

Friction pulls directly against the direction of motion (at 180) of a sled, and does -55.2 J of work while the sled moves 8.98 m

zvonat [6]

The magnitude of the force of friction is 6.1 N

Explanation:

The work done by a force when moving an object is given by the equation:

$W=Fd cos \theta$

where :

F is the magnitude of the force

d is the displacement

$\theta$ is the angle between the direction of the force and of the displacement

In this problem, we have:

W = -55.2 J (work done by the force of friction)

d = 8.98 m (displacement of the sled)

$\theta=180^{\circ}$ (because the force of friction acts opposite to the direction of motion)

By solving the equation for F, we find the magnitude of the force of friction on the sled:

$F=\frac{W}{d cos \theta}=\frac{-55.2}{(8.98)(cos 180^{\circ})}=6.1 N$

Learn more about work:

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3 years ago

What is necessary for a convection cell to be set up in a fluid?

Vitek1552 [10]

Convection cells don't work in solids.

In order for convection to happen, material with some temperature and density has to FLOW to a place where the material there has a different temperature and density.

Material doesn't FLOW in solids, only in FLuids.

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3 years ago

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Consider a halfback with a mass of 90kg running down the football field and encountering a collision with a defensive back. If t

sasho [114]

Answer:

The impulse experienced by the halfback is 720 N-s.

Explanation:

We have,

Mass of a halfback is 90 kg

Force experienced by the halfback is 800 N

Time for which the force is applied is 0.9 seconds

It is required to find the impulse experienced by the halfback. Impulse applied by an object is given by the product of force applied for a very short duration of time. It can be given by :

$J=F\times t\\\\J=800\times 0.9\\\\J=720\ N-s$

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Meters is the unit most likely to measure a racetrack

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