Physics Exam 2

# Physics Exam 2 - 1. 4.0 J of work are performed in...

This preview shows pages 1–2. Sign up to view the full content.

1. 4.0 J of work are performed in stretching a spring with a spring constant of 2500N/m. How much is the spring stretched? a. 3.2 cm b. 3.2 m c. 0.3 cm d. 5.7 m e. 5.7 cm 2. A 20-N horizontal force pushes an object along a rough floor so that the object moves with a constant velocity of 6.0 m/s. How much power does this force deliver to the object? a. 5.0 W b. 20 W c. 160 W d. 0 W e. 120 W 3. An 8 kg object moving with an initial velocity of 4 m/s comes to rest due to friction after it travels a horizontal distance of 10 m. If the initial speed of the object is doubled, what distance will it travel before coming to rest? Use g = 10m/ s2 a. 10 m b. 20 m c. 30 m d. 40 m e. 80 m 4. A snowboarder coasts on a smooth track that rises from one level to another. If the snowboarder’s initial speed is 4 m/s, the snowboarder just makes it to the upper level and comes to rest. With a slightly greater initial speed of 5 m/s, the snowboarder is still moving to the right on the upper level. What is the

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 03/24/2009 for the course PHYS 104 taught by Professor Pengyi during the Fall '08 term at UNC.

### Page1 / 2

Physics Exam 2 - 1. 4.0 J of work are performed in...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online