An all-terrain vehicle of 2000 kg mass moves up a 15.0° slope at a constant velocity of 6.00 m/s. The rate of change of gravitational potential energy with time is
a. 5.25 kW.
b. 24.8 kW.
c. 30.4 kW.
d. 118 kW.
e. 439 kW.
c
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_____ is an example of a Terrestrial planet
A) Jupiter B) Saturn C) Mars D) Neptune
When a cannon fires a cannonball, the cannon will recoil backward because the
A) momentum of the cannon is greater than the energy of the cannonball. B) momentum of the cannonball and cannon is conserved. C) momentum of the cannon is conserved. D) energy of the cannonball and cannon is conserved. E) energy of the cannon is greater than the energy of the cannonball.
An atomic nucleus has a size of about
A) 10-6 meters. B) 10-15 meters. C) 10-12 meters. D) 10-9 meters.
What helps explain the fact that neutrons rather than protons make the nucleus of a heavier element more stable?
a. The gravitational force of the neutrons attracts all other nucleons, but a proton can also repel other nucleons with the same charge. b. The weak force in the nucleus of a heavy element is balanced by the presence of more neutrons. c. The strong force for between a neutron and another nucleon is much stronger than between a proton and a proton. d. The strong force exerted by both neutrons and protons acts between neighboring nucleons, while the electrostatic repulsion between protons has longer range. e. The strong force increases as the element gets heavier, which makes it harder for protons to join the nucleus.