The coefficient of linear expansion of aluminum is 24.0 × 10-6 K-1 and the density of aluminum at 0°C is 2.70 × 103 kg/m3. What is the density of aluminum at 300°C?
A) 3.93 × 103 kg/m3
B) 2.73 × 103 kg/m3
C) 2.70 × 103 kg/m3
D) 2.67 × 103 kg/m3
E) 2.64 × 103 kg/m3
E
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Edwin Hubble and Milton Humason discovered that there was a linear relationship between a galaxy's ____
a. rotation curve and distance b. mass and luminosity c. age and distance d. apparent recession velocity and distance e. mass and recession velocity
If we increase the resistance in the LR circuit shown in figure E17.1b, how would this change the rate of decay of the current through the coil?
A. The current will decay more quickly.
B. The current will decay more slowly.
C. There will be no change in the rate of decay.
D. One needs more information to answer the question.
What phase of the Moon must it be to have a lunar eclipse?
A. full moon B. first quarter C. new moon D. third quarter
Exhibit 13-1
Two blocks of masses m1 and m2 are connected by a light cord that passes over a pulley of mass M, as shown. Block m2 slides on a frictionless horizontal surface. The blocks and pulley are initially at rest. When m1 is released, the blocks accelerate and the pulley rotates.
?
?
Use this exhibit to answer the following question(s).
Refer to . The total angular momentum of the system of the two blocks and the pulley relative to the axis of rotation of the pulley is
a.
the same at all times.
b.
proportional to l1, the length of string from the pulley to m1.
c.
proportional to l2, the length of string from the pulley to m2.
d.
conserved because the Earth doesn't move.
e.
proportional to the speed of the blocks.