Horace Suppose a hypothetical Planet revolves about hypothetical stav along Circular or bit of radius 4x10¹⁰ m. if the peired of rotation of the planet is 25 Years. Calculate the mass of the star.​

To practice problem-solving strategy 10.1 for energy conservation problems. a sled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slides a distance d1 down the slope and then covers the distance d2 along the horizontal terrain before stopping. find the coefficient of kinetic friction μk between the sled and the ground, assuming that it is constant throughout the trip.