Homework Help: Science Check

Posted by Abby on Friday, March 9, 2007 at 2:39pm.

1)Two balls having the same mass of 1 kg roll toward each other, each moving at the same speed of 1 m/s. What is the combinded momentum?

Would it be 0 kg m/s

2)A 30 kg girl and a 25kg boy face each other on friction free roller blades. The girl pushes the boy who moves away at 1 m/s. The girls speed is?

Would it be .45

3)The power extended when a 10 N barbell is raised 2.0 m in 2 s is _____ watts
would it be 40?

4)Car A travels for times as fast as Car B. When braking to a stop Car A skids____ times as far as car B.

16?

(1) yes
(2) no. 30*Vgirl = -25*Vboy
Solve for Vgirl when Vboy = 1
(3) no. DIVIDE the work by the time
(4) yes. 4^2 = 16 Do you know why the skid is proportional to the square of speed? It has to do with kinetic energy

Science Check - jeremy, Tuesday, August 19, 2008 at 2:23pm
would it be 55

Answer this Question

Related Questions

physics - Two identical balls are moving at the same speed of 3 m/s toward each ...
Physics -Conservation of Momentum- - 1) A 1 kg mass moving at 1 m/s has a ...
Physics -Conservation of Momentum- - 1) A 1 kg mass moving at 1 m/s has a ...
Physics ~really need help!~ - 1) A 1 kg mass moving at 1 m/s has a totally ...
phyics - A 0.2 kg plastic ball moves with a velocity of 1.5 m/s. It collides ...
physics - A 0.210 kg plastic ball moves with a velocity of 0.30 m/s. It collides...
physics - A 0.210 kg plastic ball moves with a velocity of 0.30 m/s. It collides...
physics - A 0.203 kg plastic ball moves with a velocity of 0.30 m/s. It collides...
physics - A 0.201-kg plastic ball moves with a velocity of 0.30 m/s. It collides...
Physics - A 0.201-kg plastic ball moves with a velocity of 0.30 m/s. It collides...

For Further Reading

First Name:
School Subject:
Answer: