All categories

3 years ago

Kinetic energy is exchanged when _____ happens?

Physics

2 answers:

Zarrin [17]3 years ago

7 0

Kinetic energy is exchanged when contact happens

Mkey [24]3 years ago

4 0

I think the answer is B.

You might be interested in

A 0.200-kilogram ball A is traveling at a velocity of 2 meters/second. It hits a 1-kilogram stationary ball B. Which statement i

ioda

As we know that collision is elastic so we will have

$e = 1 = \frac{v_2 - v_1}{2 - 0}$

$v_2 - v_1 = 2 m/s$

also we can use momentum conservation

$P_{1i} + P_{2i} = P_{1f} + P_{2f}$

$0.200(2m/s) + 0 = 0.200 v_1 + 1v_2$

$0.4 = 0.2v_1 + v_2$

now from above two equations we will have

$1.2 v_1 = -1.6$

$v_1 = -1.33 m/s$

also we have

$v_2 = 0.66 m/s$

so both balls will separate after collision and move in opposite direction as the final velocities are opposite in sign

So correct answer will be

<em>D. The balls separate and move in opposite directions.</em>

8 0

3 years ago

A brick has a mass of 562 g and a volume of 43 cm3. What is the density?

alexgriva [62]

Answer:

13.069 g/cm^3

Explanation:

to get density, simply divide the mass by the volume. Your equation would look like this; p=562/43

'P' represents density in this equation. Never forget to add your units!

Hope this helps!

3 0

3 years ago

If the resultant of two velocity vectors of equal magnitude is also of the same magnitude, then which statement must be correct?

Tamiku [17]

The correct option is C) The angle between the vectors is 120°.

Why?

We can solve the problem and find the correct option using the Law of Cosine.

Let A and B, the given two sides and R the resultant (sum),

Then,

$R=A=B$

So, using the law of cosines, we have:

$R^{2}=A^{2}+B^{2}+2ABCos(\alpha)\\ \\A^{2}=A^{2}+A^{2}+2*A*A*Cos(\alpha)\\\\0=A^{2}+2*A^{2}*Cos(\alpha)\\\\Cos(\alpha)=-\frac{A^{2}}{2*A^{2}}=-\frac{1}{2}\\\\\alpha =Cos(-\frac{1}{2})^{-1}=120\°$

Hence, we have that the angle between the vectors is 120°. The correct option is C) The angle between the vectors is 120°

Have a nice day!

4 0

3 years ago

A particle moves with a velocity    1 v 5j 3j 6k ms      under influence of a contact force  F 10i 10j 20k N.    

katrin2010 [14]

Answer:

P = 200 W

Explanation:

The expression for the power is

P = W / t

the job

W = F d

we substitute

P = F d / t

P = F. v

We apply this equation to our case where the velocity is

v = (5 i + 3j + 6k) m / s

and the force is

F = (10i + 10j +20 k) N

we substitute in the power equation, remember that the scalar product of the unit vectors is

i.i = j.j = k.k = 1 and the other products are zero

P = 10 5 + 10 3 + 20 6

P = 200 W

6 0

3 years ago

Which type of research involves studying individuals or a specific group in depth in order to learn about them and apply what is

Vadim26 [7]

Answer:

The most common type of descriptive research is the case study, which provides an in-depth analysis of a specific person, group, or phenomenon.

6 0

3 years ago