A small block is sent through point A with a speed of 7.0 m/s. Its path is without friction until it reaches the section of length L=12 m, where the coefficient of kinetic friction is 0.70. The indicated heights are h subscript 1 equals 6.0 space m and h subscript 2 equals 2.0 space m. What is the speed of the block at point B? Express to 3 sig figs.

Astronomers discover an exoplanet (a planet of a star other than the sun) that has an orbital period of 3.87 earth years in its circular orbit around its sun, which is a star with a measured mass of 3.59 x 1030 kg. find the radius of the exoplanet's orbit.

You are traveling in a car going at a constant speed of 100km/h down a long, straight highway. you pass another car going in the same direction which is traveling at a constant speed of 80km/h. as measured from your car's reference frame this other car is traveling at −20km/h. what is the acceleration of your car as measured from the other car's reference frame? what is the acceleration of the other car as measured from your car's reference frame?

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?