Homework Help: Physics

Posted by Amy on Saturday, January 5, 2008 at 11:03pm.

Can someone check my answers for the following questions. Thanks you.

1)A hockey puck's average velocity is 22 m/s. What is its displacement after 6.0s?

Answer: 132 m

2)It is 0.30 seconds after seeing a puff of smoke rise from the starter's pistol; the sound of firing the pistol is heard by the track timer 100 m away. What is the velocity of sound?

Answer: 333 m/s

3)The x- and y-components of a velocity vector of 100 N at 240 degrees would be:

Answer: -50 N,+86.6

4)A man pushes a lawn mower across the lawn exerting 5 N of force along the handle at an angle of 25 degrees with the ground. What is the x-component of the force he exerts?

Answer: 5.0

Physics - Damon, Sunday, January 6, 2008 at 4:31am
3) both the sin and cos of 240 are negative

4) cos 25 = .906
5 N cos 25 = 4.53 N

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