Question

4. An astronaut drops a 3.60kg object onto the surface of a planet. It takes 2.60s to fall 1.86m and hit the ground. If the planet has a radius of 8.40 × 106m, what is its mass?

5. A current carrying wire (4.2m long) passes through a magnetic field of 52T. If it experiences of force of 120N, how much current is the wire carrying?

6. A peanut floats between the Earth (m=5.97 × 1024kg) and the Moon (m=7.35 × 1022 ). The distance between the Earth and the Moon is 3.85 × 108m. The peanut is 1.28 × 108m from the centre of the Moon. What is the net gravitational field on the peanut? Include direction.

Answer 1