A 15-kg mass, attached to a massless spring whose force constant is 2500 N/m, has an amplitude of 4 cm. Assuming the energy is quantized, find the quantum number of the system, n, if En = nhf
a. 1.5 × 10^33
b. 3.0 × 10^33
c. 4.5 × 10^33
d. 5.4 × 10^33
e. 1.0 × 10^33
a
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Five motion diagrams in which points represent the positions of an object at equal time intervals are shown below. Which statement is correct?
?
a.
A has the greatest speed and the greatest acceleration.
b.
C has decreasing speed.
c.
D slows down and then speeds up.
d.
D speeds up and then slows down.
e.
E has a greater speed than A.
Compare the rate of heat flow from the bottom to the top in the aluminum structure shown in the sketch below with the rate of heat flow through a solid slab. The top is at –10°C, the bottom at 0°C. The holes are filled with insulation which does not conduct heat appreciably.
GIVEN
The aluminum structure shown in the sketch below
Temperature of the top (TT) = – 10°C
Temperature of the bottom (TB) = 0°C
The holes are filled with insulation which does not conduct heat appreciably
FIND
Compare the rate of heat flow from the bottom to the top with the rate of heat flow through a solid slab
ASSUMPTIONS
Compare the rate of heat flow from the bottom to the top with the rate of heat flow through a solid slab
ASSUMPTIONS
The structure is in steady state
Heat transfer through the insulation is negligible
The thermal conductivity of the aluminum is uniform
The edges of the structure are insulated
Two dimensional conduction through the structure
SKETCH
A space station out beyond the solar system is rotating with constant angular velocity. A spaceship heading into the station along a diameter of the station, uses its rockets to brake, and then docks inside the station at its center. When the spaceship docks, the angular momentum of the system consisting of the station and ship
a. is less than the original angular momentum of the station. b. is the same as the original angular momentum of the station. c. is greater than the original angular momentum of the station. d. is less than the original angular momentum of the station, but the angular velocity increases. e. is greater than the original angular momentum of the station, but the angular velocity decreases.
Two point charges are placed along a horizontal axis with the following values and positions: +3.0 µC at x = 0 cm and -6.0 µC at x = 20 cm. At what point along the x axis is the electric field zero?
a. 8.0 cm c. -38 cm b. -48 cm d. -69 cm