Kepler's first law of planetary motion implies that:
A) the planets move at constant speeds at all points in their orbits.
B) all the planets move around Earth in elliptical orbits.
C) uniform circular motion is adequate to describe the motion of all the planets.
D) the planets move in elliptical orbits around the Sun.
D
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The Earth has a radius of about 6000 km. How long would it take for an object traveling at the speed of light to circle the Earth? (Recall that the speed of light is 300,000 km/s.)
A) 1/300,000 of a second (0.0000033 s) B) 1/6000 of a second (0.000017 s) C) 1/8 of a second (0.0125 s) D) 1/2 of a second (0.5 s)
Suppose you live at the North Pole. Describe the path of the Sun through your sky for each of the following days: a. the day of the spring equinox b. the day of the summer solstice c. the day of the winter solstice
What will be an ideal response?
In an RLC ac circuit, the values of the inductance and capacitance are both doubled. As a result of this change, the resonance frequency of the circuit is
A) twice the original value. B) four times the original value. C) the same as before. D) reduced to one-fourth the original value. E) reduced to one-half the original value.
A light ray bends when it goes from one medium to another because of diffraction
Indicate whether the statement is true or false