The atomic number equals the number of protons in a nucleus
a. True
b. False
Indicate whether the statement is true or false
True
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A point on the rim of a 0.15-m-radius rotating disk has a centripetal acceleration of 5.0 m/s2 . What is the angular speed of a point 0.075 m from the center of the disk?
a. 0.89 rad/s b. 1.6 rad/s c. 3.2 rad/s d. 5.8 rad/s
A 5-kg ball collides inelastically head-on with a 10-kg ball, which is initially stationary. Which of the following statements is true? (There could be more than one correct choice.)
A) The magnitude of the change of velocity the 5-kg ball experiences is greater than that of the 10-kg ball. B) The magnitude of the change of velocity the 5-kg ball experiences is equal to that of the 10-kg ball. C) Both balls lose all their momentum since the collision is inelastic. D) The magnitude of the change of velocity the 5-kg ball experiences is less than that of the 10-kg ball. E) The magnitude of the change of the momentum of the 5-kg ball is equal to the magnitude of the change of momentum of the 10-kg ball.
A muon formed high in the Earth's atmosphere travels at a speed 0.990c for a distance of 6.40 km before it decays. What is the muon's lifetime as measured in its reference frame?
a. 4.65 × 10^-6 s c. 2.18 × 10^-6 s b. 1.55 × 10^-5 s d. 3.04 × 10^-6 s
A stone is thrown horizontally from the top of a tower at the same instant that a ball is dropped vertically. Which object is traveling faster when it hits the level ground below?
A) Neither, since both are traveling at the same speed. B) It is impossible to tell from the information given. C) the ball D) the stone