1. The fundamental force that: (4 marks)
____ 1. causes hair to stand on end after being
rubbed by a balloon a) strong nuclear
____ 2. causes protons to remain in the nucleus
despite repulsive forces b) weak nuclear
____ 3. controls the planets' orbit around the sun c) electromagnetic
____ 4. ensures light doesn’t emerge from a black
hole d) gravitational
____ 5. is responsible for fusion on the sun
____ 6. changes a proton into a neutron
____ 7. is responsible for residual colour force
(colour force holds quarks together)
____ 8. is responsible for the aurora borealis
2. A 1.20 x 105 kg exploratory satellite in orbit around the Jupiter wants to increase its orbit from
1.00 x 105 m above the surface to 2.00 x 105 m above the surface. Determine the amount of
energy required to move orbits. (3 marks)
3. A 5.50 x 104 kg rocket is launched from the surface of the Earth with a speed of 888 m/s.
Determine its maximum height. (4 marks)
4. Determine the orbital speed of the moon and the value of the gravitational field on its surface
(neglect any field effects due to the Earth). (4 marks)
5. Determine the force of repulsion between two alpha particles located 5.0 x10-5 m apart. Note
that an alpha particle is a helium nucleus (2 protons, 2 neutrons) with the electrons stripped
away. (2 marks)
6. A proton with a mass of 1.67 x 10-27 kg is released from rest from the positive plate in a
parallel plate apparatus. If the voltage applied to the plates is 350 V, determine the velocity of the
proton just before it hits the negative plate. (3 marks)
2 answers
and gravity keeps the planets in orbit by the way
1 answer