Saturday

January 31, 2015

January 31, 2015

Posted by **.** on Tuesday, October 5, 2010 at 1:10pm.

Question: A slingshot obeying Hooke's law is used to launch pebbles vertically into the air. You observe that if you pull a pebble back 2.00 cm against the elastic band, the pebble goes 3.00 m high.

Part A (already answered correctly): Assuming that air drag is negligible, how high will the pebble go if you pull it back 5.00 cm instead? Answer: h = 18.8 m

Part B (already answered correctly): How far must you pull it back so it will reach 13.0 m? Answer: x = 4.16 cm

Part C: If you pull a pebble that is twice as heavy back 3.00 cm, how high will it go? Answer: h = ___ cm

- Physics -
**bobpursley**, Tuesday, October 5, 2010 at 1:14pmgiven 3m high, at 2cm pull.

OK, you are pulling it 50 percent more, and doubling mass.

doubling mass will halve the height (PE=mgh)

The PE in the elastic goes by 1/2 k x^2, so if you increase the x to 1.50, that squared is 2.25x, so

doubling mass, pulling to 3cm, should make height 3m*1/2*2.25

**Answer this Question**

**Related Questions**

Physics - If a 40 kg brick and a 400 kg brick each dropped from 1 m above a ...

Physics - All answers should be in degrees. (a) Using the result of Lecture 31 ...

Physics - f a 40 kg weight and a 200 kg weight each dropped from 1 m above the ...

math help - Use the following table to answer the questions. (Give your answers ...

Statistics - A sample of 148 values is randomly selected from a population with ...

Physics - When the rubber band in a slingshot is stretched, it obeys Hooke's law...

Physics - If a 40 kg brick and a 400 kg brick each dropped from 1 m above a ...

Physics - If a 40 kg brick and a 400 kg brick each dropped from 1 m above a ...

math - Can someone please help me on these I have look at the examples and done ...

Math - Does studying for an exam pay off? The number of hours studied, x, is ...