Can sombody help me this theory problems, and explain why please 4. [2pt] You ar

Question

Can sombody help me this theory problems, and explain why please

4. [2pt] You are calculating the acceleration for a ski jumper that slides down a take?off ramp, which is inclined at an angle theta. The coefficent of kinetic friction between the skis and the snow is MuK. Starting from a freebody diagram and Newton?s Law you find: a = g(sintheta - Mukcos theta) Here, g is free fall acceleration. Let a1 be the acceleartion for an athlete of mass m1. What is the acceleration for an athlete of twice that mass? A) a1/2 B) 4 x a1 C) root 2 x a1 D) a1 E) 2 x a1 5. [2pt] A roller coaster cart approaches a sequence of two hills, the second twice as high as the first. At the top of the first hill, the cart has slowed down to half its initial speed. Which statement is correct? (Ignore friction.) A) The cart will come to rest at the top of the second hill. B) The cart will stop in the valley between the two hills. C) The cart will not make it up to the second hill. D) The cart will pass over the second hill.

Explanation / Answer

Q.4.

Acceleration of the athlete will be = Normal force on athlete/mass

So acceleration = gsin? -

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