# math

posted by .

Your roommate is working on his bicycle and has the bike upside down. He spins the 68.0cm -diameter wheel, and you notice that a pebble stuck in the tread goes by three times every second.
What is the pebble's speed?
What is the pebble's acceleration?

• math -

speed=distance/time=PI*68cm/.3333sec

of course, radius is still half diameter.

• math -

2-5

## Similar Questions

1. ### math

Your roommate is working on his bicycle and has the bike upside down. He spins the 68.0cm -diameter wheel, and you notice that a pebble stuck in the tread goes by three times every second.
2. ### physics

A slingshot fires a pebble from the top of a building at a speed of 16.0 m/s. The building is 32.0 m tall. Ignoring air resistance, find the speed with which the pebble strikes the ground when the pebble is fired (a) horizontally, …
3. ### Physics

In preparation for this problem, review Conceptual Example 7. From the top of a cliff, a person uses a slingshot to fire a pebble straight downward, which is the negative direction. The initial speed of the pebble is 6.46 m/s. (a) …
4. ### physics

A 1.1 pebble is stuck in a tread of a 0.85 diameter automobile tire, held in place by static friction that can be at most 3.9 . The car starts from rest and gradually accelerates on a straight road.How fast is the car moving when the …
5. ### physics

From the top of a cliff, a person uses a slingshot to fire a pebble straight downward, which is the negative direction. The initial speed of the pebble is 9.0 m/s. (a) What is the acceleration (magnitude and direction) of the pebble …
6. ### math

an object released from rest will fall 16t^2 feet, t seconds after it is dropped. 2 pebbles are dropped, one after the other, from a cliff that is 64 feet high. the 2nd pebble is released the instant the first pebble has fallen exactly …
7. ### calculus HELP!

A person stands on a bridge that is 100 feet above a river. If she drops a pebble how fast is it moving after 2 seconds?
8. ### math calculus

A person stands on a bridge that is 100 feet above a river. If she drops a pebble how fast is it moving after 2 seconds?
9. ### Physics

From the top of a cliff, a person uses a slingshot to fire a pebble straight downward, which is the negative direction. The initial speed of the pebble is 7.56 m/s. (a) What is the acceleration (magnitude and direction) of the pebble …
10. ### Physics

rom the top of a cliff, a person uses a slingshot to fire a pebble straight downward, which is the negative direction. The initial speed of the pebble is 7.56 m/s. (a) What is the acceleration (magnitude and direction) of the pebble …

More Similar Questions