Based on current estimates of the value of Hubble's constant, how old is the universe?
A) between 4 and 6 billion years old
B) between 8 and 12 billion years old
C) between 12 and 16 billion years old
D) between 16 and 20 billion years old
E) between 20 and 40 billion years old
C
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A sphere hanging freely from a cord is in
A) stable equilibrium. B) unstable equilibrium. C) neutral equilibrium. D) positive equilibrium. E) negative equilibrium.
In the figure, the coefficient of kinetic friction between the surface and the larger block is 0.20, and the coefficient of kinetic friction between the surface and the smaller block is 0.30. If F = 14 N and M = 1.0 kg, what is the magnitude of the acceleration of either block?
a.
2.0 m/s2
b.
1.3 m/s2
c.
1.5 m/s2
d.
1.8 m/s2
e.
3.5 m/s2
A family goes on vacation for one week but forgets to turn off an electric fan that consumes electricity at the rate of 200 W. If the cost of electricity is 12.0ยข/kW?h how much does it cost (to the nearest penny) to run the fan for the week?
What will be an ideal response?
An object is attached to a spring, and its frequency of oscillation is measured. Then another object is connected to the first object, and the resulting mass is nine times the original value. By what factor is the frequency of oscillation changed?
a. 9 c. 1/3 b. 3 d. 1/9