The _____ of an object is a measure of the amount of matter in the object
A) weight
B) mass
C) height
D) velocity
B
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Compared to ultraviolet waves, the frequency of infrared waves is
A) lower. B) the same. C) higher.
When a planet's orbit takes it closest to the Sun, it's called
A) vernal equinox. B) perihelion. C) aphelion. D) crossing the ecliptic. E) none of the above; a planet's distance from the Sun never changes.
Fireworks go off at the same time according to Earth clocks in two cities, Alum and Boron, that are 300 km apart. The people in a spaceship that is flying in a straight line from Alum to Boron at 0.80 c also observe the fireworks. Do they see the fireworks in the two cities simultaneously? If the people in the spaceship say the fireworks were not simultaneous in Alum and Boron, how long before or
after the fireworks flashed at Alum did the fireworks flash at Boron according to their calculations? (The spaceship is directly over Alum when the fireworks flash.) a. Yes; 0 b. Before; 1.0 × 10^?3 s c. After; 1.0 × 10^?3 s d. Before; 1.3 × 10^?3 s e. After; 1.3 × 10^?3 s
Is it possible for an object to have a velocity of zero and a numerical value for acceleration? Justify your answer with an example