A 0.200-kg object, attached to a spring with spring constant k = 16.0 N/m, is moving on a horizontal frictionless surface in simple harmonic motion of amplitude of 0.0840 m. What is its speed at the instant when its displacement is 0.0420 m? (Hint: Use conservation of energy.)
a. 6.51 m/s
b. 0.269 m/s
c. 65.1 cm/s
d. 84.0 cm/s
e. 46.0 cm/s
c
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Assume you lived on the Moon and noticed the Earth high in the sky. From that location, how often would the Earth set below your horizon?
a. every 24 hours b. once a sidereal period (27.3 days) c. once a synodic period (29.5 days) d. every year e. never
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.
What is the current through the 8.0-? resistor?
a.
1.0 A
b.
0.50 A
c.
1.5 A
d.
2.0 A
100 g of liquid nitrogen at its boiling point of 77 K is stirred into a beaker containing 600 g of 15°C water. If the nitrogen leaves the solution as soon as it turns to gas, how much water freezes? The heat of vaporization of nitrogen is 48 cal/g and that of water is 80 cal/g
a. none c. 68 g b. 29 g d. 109 g