Three resistors, each with resistance R1, are in series in a circuit. They are replaced by one equivalent resistor, R. Comparing this resistor to the first resistor of the initial circuit, which of the following is true?
a. The current through R equals the current through R1.
b. The voltage across R equals the voltage across R1.
c. The power given off by R equals the power given off by R1.
d. R is less than R1.
a
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Which of these (hypothetical) modifications would cause lunar eclipses to happen once per month?
A) Change the Moon's orbital plane so it tilts the opposite way. B) Change the orbital plane of the Moon so it lies in the same plane as Earth's orbit around the Sun. C) Relocate the Moon to twice its current distance from the Earth. D) Make the Moon orbit the Earth twice as fast.
What type of exoplanet observation allows unambiguous determination of the exoplanet's mass and radius? Can this be done with most exoplanets?
What will be an ideal response?
A rifle is aimed horizontally toward the center of a target 0.10 km away, but the bullet strikes 10 cm below the center. Calculate the velocity of the bullet just as it emerges from the rifle
A 2.0-kg block slides down a frictionless incline from point A to point B. A force (magnitude P = 3.0 N) acts on the block between A and B, as shown. Points A and B are 2.0 m apart. If the kinetic energy of the block at A is 10 J, what is the kinetic energy of the block at B?
A. 27 J B. 20 J C. 24 J D. 17 J E. 37 J