What kind of acceleration occurs when an object speeds up?.

A billiard ball is moving in the x-direction at 30.0 cm/s and strikes another billiard ball moving in the y-direction at 40.0 cm

PSYCHO15rus [73]

Explanation:

Given that,

Initial speed of the billiard ball 1, u = 30i cm/s

Initial speed of another billiard ball 2, u' = 40j cm/s

After the collision,

Final speed of first ball, v = 50 cm/s

Final speed of second ball, v' = 0 (as it stops)

Let us consider that both balls have same mass i.e. m

Initial kinetic energy of the system is :

$K_i=\dfrac{1}{2}mu^2+\dfrac{1}{2}mu'^2\\\\K_i=\dfrac{1}{2}m(u^2+u'^2)\\\\K_i=\dfrac{1}{2}m((30)^2+(40)^2)\\\\K_i=1250m\ J$

Final kinetic energy of the system is :

$K_f=\dfrac{1}{2}mv^2+\dfrac{1}{2}mv'^2\\\\K_f=\dfrac{1}{2}m(v^2+v'^2)\\\\K_f=\dfrac{1}{2}m((50)^2+(0)^2)\\\\K_f=1250m\ J$

The change in kinetic energy of the system is equal to the difference of final and initial kinetic energy as :

$\Delta K=K_f-K_i\\\\\Delta K=1250m-1250m\\\\\Delta K=0$

So, the change in kinetic energy of the system as a result of the collision is equal to 0.

7 0

4 years ago

A football player weighing 110 kg and traveling at +6 m/s runs head on into another player who weighs 150 kg and is traveling a

Schach [20]

This is an <em>inelastic </em>collision. The equation for an inelastic collision is: $m_{1}v_{1}_{i} + m_{2}v_{2}_{i} = (m_{1} + m_{2})v_{f}$

(110)(6) + (150)(-4) = (110 + 150)(vf)

660 - 600 = 260vf

60 = 260vf

vf = 0.2308 m/s

They will travel in the positive direction, right, and their combined velocity will be 0.2308 m/s.

Hope this helps!! :)

6 0

4 years ago

A horizontal spring on a frictionless surface has a spring constant of 10 N/m with a mass of 2kg attached to the end of the spri

Alex

Answer:

0.356 times the mass pass through equilibrium per second.

Explanation:

Given that,

Spring constant = 10 N/m

Mass = 2 kg

Stretched spring = 2m

We need to calculate the frequency

Using formula of frequency

$f=\dfrac{1}{2pi}\sqrt{\dfrac{k}{m}}$

Where, m = mass

k = spring constant

Put the value into the formula

$f=\dfrac{1}{2\pi}\sqrt{\dfrac{10}{2}}$

$f=0.356\ Hz$

We know that,

Hertz = cycle per second

Hence, 0.356 times the mass pass through equilibrium per second.

4 0

3 years ago

How many planets are there?

Leno4ka [110]

There are 7 planets in all

6 0

4 years ago

What determines whether a surface produces a specular reflection or a diffuse reflection?

rjkz [21]

Answer:

Explanation:

when the surface is super smooth, the light reflects in all the same. which makes a good reflection. Like how a very calm lake can look like a mirror. the water gets very very smooth. or a mirror is very smooth too. If the surface reflects like more randomly.. like when a lake is rough or wind is blowing over it .. and there a small waves it's not a good "even" reflection.

3 0

3 years ago