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2 years ago

Explan first netwons law in words

2 answers:

7 0

If something is at rest it will stay at rest aka stay still but if two things are moving at the same speed and same direction they are the same unless something happens to the other object. i hope this helps

inessss [21]2 years ago

3 0

An object either remains at rest until acted upon

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Why heat capacity for polymer higher than metal?

jok3333 [9.3K]

Because polymers are covalently bonded material, and metals are metalicly bonded material.

Covalent bonds do not let atoms exchange electrons like metalic bonds do.

4 0

3 years ago

Joe has a mass of 40 kg, and Sally has a mass of 25 kg. They sit in class with a separation of 6 meters. Find the gravitational

goldfiish [28.3K]

Answer:

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Explanation:

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3 years ago

Water is flowing in a pipe with a circular cross section but with varying cross-sectional area, and at all points the water comp

slamgirl [31]

(a) 5.66 m/s

The flow rate of the water in the pipe is given by

$Q=Av$

where

Q is the flow rate

A is the cross-sectional area of the pipe

v is the speed of the water

Here we have

$Q=1.20 m^3/s$

the radius of the pipe is

r = 0.260 m

So the cross-sectional area is

$A=\pi r^2 = \pi (0.260 m)^2=0.212 m^2$

So we can re-arrange the equation to find the speed of the water:

$v=\frac{Q}{A}=\frac{1.20 m^3/s}{0.212 m^2}=5.66 m/s$

(b) 0.326 m

The flow rate along the pipe is conserved, so we can write:

$Q_1 = Q_2\\A_1 v_1 = A_2 v_2$

where we have

$A_1 = 0.212 m^2\\v_1 = 5.66 m/s\\v_2 = 3.60 m/s$

and where $A_2$ is the cross-sectional area of the pipe at the second point.

Solving for A2,

$A_2 = \frac{A_1 v_1}{v_2}=\frac{(0.212 m^2)(5.66 m/s)}{3.60 m/s}=0.333 m^2$

And finally we can find the radius of the pipe at that point:

$A_2 = \pi r_2^2\\r_2 = \sqrt{\frac{A_2}{\pi}}=\sqrt{\frac{0.333 m^2}{\pi}}=0.326 m$

6 0

2 years ago

Can a average velocity be zero.Why?

marishachu [46]

Answer:

Yes

Explanation:

Average velocity is the ratio of total displacement and time taken for that displacement:

$average \space\ velocity = \frac{displacement}{time}$

This means if displacement is zero, then average velocity will also be zero.

Displacement is zero when an object moves some distance in one direction, and then moves the same distance but in the opposite direction.

∴ As it is possible for displacement to be zero, it is also possible for average velocity to be zero.

4 0

1 year ago

A ball is thrown vertically upward. What is its acceleration right before it hits the earth?

Bezzdna [24]

The entire time the ball is in the air, its acceleration is 9.8 m/s2 down provided this occurs on the surface of the Earth. Note that the acceleration can be either 9.8 m/s2 or -9.8 m/s2.
[Please Mark as Brainliest]

7 0

3 years ago

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