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# 1a.) Determine the escape velocity from the Sun for an object at the Sun's surface (r=7.0×10^5

km, M=2.0×10^30 kg).

1b.) Determine the escape velocity from the Sun for an object at the average distance of the Earth (1.50×10^8 km).

2.) A 86 kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 390 N. For the first 17 m the floor is frictionless, and for the next 17 m the coefficient of friction is 0.20. What is the final speed of the crate?

3.) A 66 kg skier starts from rest at the top of a 1200-m-long trail which drops a total of 250 m from top to bottom. At the bottom, the skier is moving 15.0 m/s. How much energy was dissipated by friction?

4.) A 67 kg trampoline artist jumps vertically upward from the top of a platform with a speed of 4.7 m/s. How fast is he going as he lands on the trampoline, 2.0 m

below? If the trampoline behaves like a spring of spring constant 6.5×10^4 N/m, what is the distance he depress it?

1 (a) V1= 6.173 10 5 m/s (b) v2 = 0.4217 ... View the full answer

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