A beam of red light and a beam of violet light each deliver the same power on a surface. For which beam is the number of photons hitting the surface per second the greatest?
A)
the red beam
B)
the violet beam
C)
The number of photons per second is the same for both beams.
D)
This cannot be answered without knowing just what the light intensity is.
A
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A satellite engine has an exhaust speed of 2.80 × 10^4 m/s and ejects ionized gas at a rate of 2.50 × 10^–6 kg/s. What is the instantaneous thrust of the engine?
a. 8.93 × 10^–11 N b. 7.00 × 10^–2 N c. 5.30 × 10^2 N d. 1.12 × 10^10 N
A string is wrapped tightly around a fixed frictionless pulley that has a moment of inertia of 0.0352 kg ? m2 and a radius of 12.5 cm. The string is pulled away from the pulley with a constant force of 5.00 N, causing the pulley to rotate
What is the speed of the string after it has unwound 1.25 m if the string does not slip on the pulley? A) 2.09 m/s B) 2.36 m/s C) 1.18m/s D) 3.18 m/s E) 4.95 m/s
A 1.2-kg object moving with a speed of 8.0 m/s collides perpendicularly with a wall and emerges with a speed of 6.0 m/s in the opposite direction. If the object is in contact with the wall for 2.0 ms, what is the magnitude of the average force on the object by the wall?
a. 9.8 kN b. 8.4 kN c. 7.7 kN d. 9.1 kN e. 1.2 kN
Two bodies can be in thermal equilibrium with one another when they are at the same temperature even if they
a. absorb different quantities of thermal energy from their surroundings in equal time intervals. b. have different masses. c. have different volumes. d. have any of the properties listed above. e. have any of the properties listed above and one of them is contact with a third body at a different temperature.