General Questions: A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s. The vector sum of all the forces acting on this crate must point
A. down the ramp.
B. up the ramp.
C. perpendicular to the ramp.
D. vertically downward.
E. None of these choices is correct.
Answer: E
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If light in a spectroscope passed through round holes instead of slits, spectral lines would appear
A) as thicker lines. B) round. C) dimmer.
A 100-kW radio station emits EM waves in all directions from an antenna on top of a mountain. What is the intensity of the signal at a distance of 10 km?
A. 8 × 10?5 W/m2 B. 8 × 10?6 W/m2 C. 3 × 10?3 W/m2 D. 0.8 W/m2 E. 2.5 × 10?5 W/m2
A gold ring has an inner diameter of 2.168 cm at a temperature of 15.0°C. Determine its diameter at 100.0°C. (?GOLD = 1.42 × 10?5/°C)
What will be an ideal response?
The fact that we can only calculate probabilities for values of physical quantities in quantum measurements means that
a. radiation and matter are not described by mathematical relations between measurements. b. the probabilities cannot be calculated from mathematical relationships. c. the results of physical measurements bear no relationship to theory. d. the average values of a large number of measurements correspond to the calculated probabilities. e. the average of the values calculated in a large number of different theories corresponds to the results of a measurement.