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3 years ago

A toy car moves 8 m in 4 s at the constant velocity. whats the car's velocity?

Physics

2 answers:

KIM [24]3 years ago

8 0

Velocity is calculated by distance and time

v = d/t
v = 8m/4s
v = 2 m/s

It's velocity is 2 meters per second

Lynna [10]3 years ago

7 0

Speed = (distance covered) / (time to cover the distance)

   = (8 m) / (4 s)

   = ( 8 / 4 ) m/s

   = 2 m/s .

That 's the toy car's speed. We can't tell its velocity,
since we have no information about its direction.

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A force of 350N is applied to a body. If the work done is 40kJ, what is the distance through which the body moved?

Studentka2010 [4]

The distance covered by the body is 114.3 m

Explanation:

The work done by a force exerted on an object is given by

$W=Fd cos \theta$

where

F is the magnitude of the force

d is the displacement of the object

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

For the object in this problem, we have

F = 350 N is the force applied

$W=40 kJ = 40,000 J$ is the work done

$\theta=0^{\circ}$ if we assume that the force is applied parallel to the motion of the object

Solving for d, we find the distance covered by the object:

$d=\frac{W}{F cos \theta}=\frac{40,000}{(350)(cos 0)}=114.3 m$

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At a playground, a child slides down a slide that makes a 42° angle with the horizontal direction. The coefficient of kinetic fr

kumpel [21]

Answer:

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Explanation:

Given,

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when she slides down now apply Newton's law

$ma =mg \sin\theta - f$

$ma = mg\sin \theta -\mu mg \cos \theta$

therefore the acceleration

$a=g \sin\theta -\mu gcos\theta$

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$a=9.8\times [\sin 42^\circ -0.2\times \cos 42^\circ]$

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Answer:

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Explanation:

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