Suppose the star Sirius were moved to a distance 7 times closer to Earth than it is now. How would its parallax angle change?
A) It would stay the same.
B) It would get smaller.
C) It would get larger.
C) It would get larger.
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Series/Parallel Circuits: When unequal resistors are connected in series across an ideal battery,
A. the same power is dissipated in each one. B. the potential difference across each is the same. C. the current flowing in each is the same. D. the equivalent resistance of the circuit is less than that of the smallest resistor. E. the equivalent resistance of the circuit is equal to the average of all the resistances.
Light from a laser is
1) monochromatic. 2) in phase. 3) coherent. 4) all of the above. Compared to the energy put into a laser, the energy of the laser beam is 5) usually much more. 6) much less. 7) the same.
An object is released from rest when it is a height h above the surface of a planet of mass M and radius R. What is the speed of the object just before striking the surface of the planet? Neglect any air resistance. Let h = 4.0 × 10^6 m, R = 5.0 × 10^6 m, and M = 4.0 × 10^24 kg
a. 7.8 km/s b. 3.5 km/s c. 5.4 km/s d. 6.9 km/s e. 4.8 km/s
In 1983 the standard meter was redefined to what it is currently. What was the previous definition from 1960 based on?
a. specific alloy bar housed at Sevres, France b. wavelength of light emitted by certain krypton atoms c. distance from the Earth's equator to the North Pole d. the distance light travels in a certain fraction of a second