An estimate of the minimum age of the solar system can made by measuring the ages of
A) zircon crystals
B) meteorites
C) comets
D) asteroids
B
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Are the Sun and the Moon ever above the horizon at the same time?
A. yes, always B. no, never C. yes, sometimes D. The moon always rises as the sun sets.
Assume that a certain city consumes electrical energy at an average rate of 2.0 × 109 W. What would be the mass change in producing enough energy to keep this city running for 21 weeks? (c = 3.00 × 108 m/s)
A) 0.28 kg B) 0.32 kg C) 0.39 kg D) 0.48 kg
How far from a covnex lens of focal length 30 cm must an object be placed so the image will be virtual and 3.0 times as large as the object?
What will be an ideal response?
A 0.40-kg particle moves under the influence of a single conservative force. At point A where the particle has a speed of 10 m/s, the potential energy associated with the conservative force is +40 J. As the particle moves from A to B, the force does +25 J of work on the particle. What is the value of the potential energy at point B?
a. +65 J b. +15 J c. +35 J d. +45 J e. ?40 J