In Fizeau's experiment for measuring the speed of light, the wheel has 475 notches. What rotational speed is required for the return beam of light to pass through the next notch? The time between successive notches is 6.65 × 10-5 s
A) 20.4 rev/sec
B) 16.6 rev/sec
C) 31.7 rev/sec
D) 66.4 rev/sec
E) 90.9 rev/sec
C
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Suppose a 0.30-kg mass on a spring-loaded gun that has been compressed 0.20 m has elastic potential energy of 1.0 J. How high above the spring's equilibrium point can the gun fire the mass if the gun is fired straight up?
a. 0.10 m c. 0.24 m b. 0.34 m d. 0.14 m
The amount of energy needed to move an electron from a lower energy level to a higher energy level is the ____
a. energy of the higher level b. energy of the lower level c. difference in energy between the two levels d. product of the energies of the two levels e. binding energy
While running, a person dissipates about 0.6 J of mechanical energy per step per kilogram of body mass. If a 60-kg person runs with a power of 70 watts during a race, how fast is the person running? Assume a running step is 1.5 m long.
What will be an ideal response?
On the Moon, no air is present. As such, which of the following waves cannot be detected
a. optical b. infrared c. radio d. sound