In choosing between sound waves and radio waves, which has the greater speed?
A) sound wave
B) radio wave
C) both the same
D) need more information
Answer: B
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Fifteen microseconds is
a. 0.0000015 s b. 0.000015 s c. 0.00015 s d. 0.015 s e. 15000000 s
A person stands 35.0 m from a flag pole. With a protractor at eye level, he finds that the angle at the top of the flag pole makes with the horizontal is 25.0 degrees
Approximately how high is the flag pole? (The distance from his feet to his eyes is 1.7 m.) A) 10 m B) 20 m C) 30 m D) 50 m E) 80 m
Which of the following hypothetical observations would demonstrate that the inflation model was incorrect?
A) The geometry of the universe is curved, not flat. B) The helium abundance in a galaxy is 29%. C) The rate of expansion of the universe has changed over time. D) Stars began to shine only a few hundred million years after the Big Bang.
A 1.5-kg mass attached to an ideal massless spring with a spring constant of 20.0 N/m oscillates on a horizontal, frictionless track. At time t = 0.00 s, the mass is released from rest at x = 10.0 cm. (That is, the spring is stretched by 10.0 cm.)
(a) Find the frequency of the oscillations. (b) Determine the maximum speed of the mass. At what point in the motion does the maximum speed occur? (c) What is the maximum acceleration of the mass? At what point in the motion does the maximum acceleration occur? (d) Determine the total energy of the oscillating system. (e) Express the displacement x as a function of time t. What will be an ideal response?