Sorry there are two questoins here. A dwarf planet called MakeMake has been foun

Question

Sorry there are two questoins here.

A dwarf planet called MakeMake has been found in the Kupier belt at the edge of our solar system. MakeMake orbits the Sun (mass =1.99e30 kg) in a nearly circular orbit with a radius of about 7.96e12 m. Find the orbital period of MakeMake in Earth Years. Years

In the sport of curling, people slide large polished rocks over level ice toward a target. Suppose a rock is released with a speed of 9.20 m/s. If the rock slides a distance of 28.0 m, from the launch point, find the coefficient of kinetic friction between the rock and ice.

Explanation / Answer

a)

The orbital period

T =2piSqrt(r3/Gm)

Given that m =1.99*1030 kg

circular orbit with a radius of about (r) = 7.96*1012 m.

G is the universal gravitational constant =6.67*10-11N.m2/kg2

substitute the values

B)

The initial speed of the rock (vo) =9.20m/s

The rock moves to a distance (s) =28m

So, the final velocity becomes zero (vf) =0

Now the acceleration is given by

v2-u2 =2as find a

Then a =-ukg

Then uk =-a/g

substitute the values to get the required answer

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