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3 years ago

According to Newton’s first law, only ___ has the ability to change motion.

Physics

1 answer:

TEA [102]3 years ago

6 0

Answer:

A force,

Explanation:

An object will stay in motion unless a the net force is non zero on an object. IE car rolling will slow down due to wheel friction as a force acting on it.

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Penny puts Fluffy in one wagon and pushes the wagon, once, as hard as she can. Penny puts Butch in the other wagon and pushes it

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D; the wagons will both move in the same way

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Godzilla was running wild in Brigham City but was finally captured. The Police

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If a second ball were dropped from rest from height ymax, how long would it take to reach the ground

Lisa [10]

Answer:

$(b)\ t_1 - t_0$

$(d)\ t_2 - t_1$

$(e)\ \frac{t_2 - t_0}{2}$

Explanation:

Given

See attachment for complete question

Required

How long to reach the ground from the maximum height

First, calculate the time of flight (T)

$T =t_2 - t_0$

The time taken (t) from maximum height to the ground is:

$t = \frac{1}{2}T$

So, we have:

$t = \frac{t_2 - t_0}{2}$

Another representation is:

At ymax, the time is: t1

On the ground, the time is t2

The difference between these times is the time taken.

So;

$t = t_2 - t_1$

Since air resistance is to be ignored, then

$t_2 - t_1 = t_1 - t_0$ --- i.e. time to reach the maximum height from the ground equals time to reach the ground from the maximum height

3 0

3 years ago

A 65 kg woman is inside an elevator. (A) Calculate her apparent weight (normal force) in Newtons if the elevator moves at consta

stiks02 [169]

Answer:

W = 637 N

Explanation:

For this exercise we will use Newton's second law

F -W = m a

where F is the force, m the mass and the acceleration

in this case the force is the weight of the body and as the elevator goes at constant speed the acceleration is zero

F = W

a = 0

F = W

W = m g

W = 65 9.8

W = 637 N

3 0

3 years ago

The intensity of the waves from a point source at a distance d from the source is I. At what distance from the sources is the in

Oliga [24]

Answer: $d'=\frac{d}{\sqrt{2}}$

Explanation:

Intensity of the waves from a point source can be given by Power divided by surface area.

For P Power source and at a distance d from source Intensity is given by

$I=\frac{P}{\pi\cdot d^2}--------1$

when intensity is 2I then it is at a distance of let say d'

$2I=\frac{P}{\pi\cdot d'^2}--------2$

Divide 1 and 2 we get

$\frac{I}{2I}=\frac{P}{\pi\cdot d^2}\times \frac{\pi\cdot d'^2}{P}$

$\frac{1}{2}=(\frac{d'}{d})^2$

$\frac{d'}{d}=\frac{1}{\sqrt{2}}$

$d'=\frac{d}{\sqrt{2}}$

8 0

3 years ago