# Physics

A half pipe can be thought of as half of a cylinder with radius of 7.00m. If a skater with mass 75.0 kg, starts with an initial velocity of 5.00 m/s at the top of the ramp, (a), what is his velocity at the very bottom of the ramp? The skater then approaches the other quarter ramp and is launched vertically into the air. How high up does he go? (Assume the ramp is frictionless)

1. energy at top = (1/2)m v^2 + m g h
= 75 (25/2+9.81*7)
energy at bottom the same but h = 0
so
75 (V^2/2) = 75 (25/2+9.81*7)
(note-- the mass does not matter)

Now if he comes up to the same height on the other side he will be moving up at 5 m/s
(1/2)(25) = 9.81 h
where h is the height above the top of the pipe.

posted by Damon

## Similar Questions

1. ### geometry

A propane tank is in the form of a cylinder with two half-spheres, one on each end. The radius of the cylinder is the same as the radius of each half-sphere. What is the volume of a propane tank of cylindrical length 12 ft and
2. ### Intergrated physics and chemistry

A 52.0-kilogram skateboarder does a trick on a half-pipe. During the trick, he reaches a speed of 8.90 m/s. The radius of the half-pipe ramp is 3.00 meters. What is the minimum centripetal force necessary to keep the skater on the
3. ### math

a. half circle with a radius of 20 cm b. half circle with a diameter of 3 ft find the perimeter of each of the half circles. i thought the answers were 12.42 ft for b and 165.6 cm for a, but i was told that i was wrong
4. ### pre algebra

A cylinder has a circumference of 16pi inches and its height is half the radius of the cylinder? What is the total surface area of the cylinder? Give answer in terms of pi. do not know how to do this....please help

2 cylinders are proportional the smaller cylinder has a radius of 4 centimeters, which is half as large as the radius of the larger cylinder. the volume of smaller cylinder =250 cubic cemtimeters. what is the volume of the larger
6. ### math

2 cylinders are proportional. The smaller cylinder has a radius of 4 cm. which is half as large as the radius of the larger cylinder.The volume of the smaller cylinder is 250 cubic cm. What is the approximate volume of the larger
7. ### Math

If the radius of a right circular cylinder is tripled and its altitude is cut in half, then the ratio of the volume of the original cylinder to the volume of the altered cylinder is?