Which of the following physics quantity measures how fast an object is moving?
Answer: speed
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Which of these is emitted when an electron falls from a higher to lower orbital?
A) a photon B) a positron C) a neutrino D) a graviton E) another electron
A force acts on an object for a time. If one eighth the force had acted for twice as long, the impulse would have been ________ as much as before.
What will be an ideal response?
A girl lifts a ball by means of a string attached to the ball. The string exerts a 30 newton force on the ball. The ball weighs 20 newtons and has a mass of 2 kilograms. The acceleration of the ball is
A) zero. B) 25 m/s2. C) 5 m/s2. D) 15 m/s2. E) 10 m/s2.
Which of the following particles participate in the strong interaction?
a. Mesons and leptons. b. Mesons and neutrinos. c. Neutrinos and leptons. d. Mesons and baryons. e. Baryons and leptons.