3. A 60 kg snowboarder begins to slide down the hill 50 m high on a smooth surface with a radius curvature of 80 m. The next section (AB) is a 20 m flat rough track with u = .3, at the end of which there is an elastic barrier with k 1000 N/m. a. Find her speed at point A. b. How much work is done by frictional force? What is the maximum compression of the spring? d. Find the rate of heat dissipation along the section AB. e. How long does it take to cover the section AB? с. h k A В
3. A 60 kg snowboarder begins to slide down the hill 50 m high on a smooth surface with a radius curvature of 80 m. The next section (AB) is a 20 m flat rough track with u = .3, at the end of which there is an elastic barrier with k 1000 N/m. a. Find her speed at point A. b. How much work is done by frictional force? What is the maximum compression of the spring? d. Find the rate of heat dissipation along the section AB. e. How long does it take to cover the section AB? с. h k A В
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Transcribed Image Text:3. A 60 kg snowboarder begins to slide down the hill 50 m high on a smooth surface
with a radius curvature of 80 m. The next section (AB) is a 20 m flat rough track
with u = .3, at the end of which there is an elastic barrier with k = 1000 N/m.
Find her speed at point A.
b. How much work is done by frictional force?
c. What is the maximum compression of the spring?
d. Find the rate of heat dissipation along the section AB.
e. How long does it take to cover the section AB?
а.
h
k
В
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