What is an inertial reference frame? It is one
a. that does not accelerate.
c. that accelerates at a constant rate.
b. that accelerates at a varying rate.
d. in which velocities are all constant.
A
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Which of the following things is an “extended object”? For each item, answer “A” if the item is an acceptable extended object, “B” if the definition of an extended object applies badly to the item, and “D” if it is debatable.
(a) An electron (b) An atom (c) A rock (d) A swarm of bees (e) The earth’s atmosphere (f) The water in an ocean current (g) Sugar molecules dissolved in a cup of water (h) The vacuum between galaxies
A person has a near point of 40 cm and a far point of 1.0 m. When looking through lenses of focal length –1.0 m, what is the nearest an object can be to be seen clearly?
a. 29 cm b. 67 cm c. 134 cm d. 140 cm e. 68 cm
When an unstable nucleus decays by emitting an alpha particle, the atomic mass number of the nucleus
A) increases by 4. B) increases by 2. C) decreases by 2. D) decreases by 4. E) remains unchanged.
A 1.0-kg ball is attached to the end of a 2.5-m string to form a pendulum. This pendulum is released from rest with the string horizontal. At the lowest point in its swing when it is moving horizontally, the ball collides elastically with a 2.0-kg block initially at rest on a horizontal frictionless surface. What is the speed of the block just after the collision?
a. 2.3 m/s b. 4.7 m/s c. 3.5 m/s d. 3.0 m/s e. 7.0 m/s