Suppose you drop a 10-pound weight and a 5-pound weight on the Moon, both from the same height at the same time. What will happen?
A) The 10-pound weight will hit the ground before the 5-pound weight.
B) Both will hit the ground at the same time.
C) Both weights will float freely, since everything is weightless on the Moon.
B) Both will hit the ground at the same time.
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Three hundred kg of water are heated from 20ºC to 80ºC and at constant pressure. Determine the enthalpy change and the heat.
What will be an ideal response?
There is a current I flowing in a clockwise direction in a square loop of wire that is in the plane of the paper. If the magnetic field B is toward the right, and if each side of the loop has length L, then the net magnetic force acting on the loop is
a.
2ILB.
b.
ILB.
c.
IBL2.
d.
zero.
Before the switch is closed in the figure, the potential across the capacitor is 200 V. At some instant after the switch is closed, the instantaneous current is 0.70 A. What is the energy in the capacitor at this instant?
a.
49 mJ
b.
31 mJ
c.
80 mJ
d.
0.13 J
e.
62 mJ
Arvin the Ant travels 30 cm eastward, then 25 cm northward, and finally 10 cm westward. In what direction is Arvin now in with respect to his starting point?
a. 59° N of E c. 29° N of W b. 29° N of E d. 51° N of E