When an 6-kg object increases its potential energy by 540 J, approximately how has its position changed?
a. It has risen vertically 9 m.
b. It has fallen vertically 9 m.
c. It has risen vertically 90 m.
d. It has moved horizontally 90 m.
Answer: c. It has risen vertically 90 m.
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Ideal Gas Law: On a cold day, you take in 4.2 L of air into your lungs at a temperature of 0°C. If you hold your breath until the temperature of the air in your lungs reaches 37°C, what is the volume of the air in your lungs at that point, assuming the pressure does not change?
A. 4.2 L B. 4.4 L C. 4.6 L D. 4.8 L E. 5.0 L
A light-emitting diode has a power output of 0.3 W. If 590 nm is the average wavelength of the source, about how many photons are emitted per second? (h = 6.63 × 10^-34 J×s, c = 3.00 × 10^8 m/s, and 1 nm = 10-9 m)
a. 1021 c. 1018 b. 1025 d. 1029
Light has wavelength 600 nm in a vacuum. It passes into glass, which has an index of refraction of 1.5. What is the frequency of the light inside the glass? (c = 3.0 × 108 m/s)
A) 3.3 × 1014 Hz B) 5.0 × 1014 Hz C) 3.3 × 105 Hz D) 5.0 × 105 Hz
Give at least one example of each of the following:
(a) longitudinal standing wave. (b) transverse standing wave.