Question

The International Space Station, which has a mass of 4.48{\times}10^54.48×10 ?5 ?? kg, orbits 250 miles above the Earth's surface, and completes one orbit every 87.3 minutes. What is the kinetic energy of the International Space Station? (Note: don't forget to take into account the radius of the Earth!) (I got 57.2. I don't know where I went wrong haha!)

A 0.957 kg object with an initial velocity of 1.6 m/s is accelerated by a constant force of 9.5 N over a distance of 1.25 m. Use energy to determine the final velocity of the object. (this is a good opportunity to double check your answer using Newton's Laws and kinematic equations.)

Answer 1

1)

Mass of International space station

Distance above the surface of earth

When an object of mass is rotating around another mass at a distance ,

Kinetic energy of International space station is

2)

Mass of object

Initial velocity of object

Force acting on object

Object is accelerated over a distance

Wor done by all the forces = Change in kinetic energy

Double checking:

Using Newton's second law of motion, Acceleration of object is

From kinematic equation