What physical quantity is measured in "watts"?
A) electric current
B) voltage
C) power
D) force
E) energy
C
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When bullets are fired from an airplane in the forward direction, the momentum of the airplane is
A) decreased. B) unchanged. C) increased.
Which planets exhibit retrograde motion, that is, periodically appear to reverse their direction of motion across the sky?
A. Only Mars, Mercury, and Venus B. Only Venus, Saturn, and Jupiter C. Only Mars, Jupiter, and Saturn D. Only Mars, Jupiter, and Venus E. All of the planets show retrograde motion
All insects are harmful to their ecosystems
What will be an ideal response?
An aurora borealis high above the atmosphere is due to
A) disturbances in Earth's magnetic field. B) fountains of high-speed charged particles. C) trapping of charged particles by Earth's magnetic field. D) all of the above