The half-life of a muon is 2.20 ?s as measured in a stationary reference frame. What is the half life of the muon (in ?s) when it is moving with a speed of v = 0.800 c?
a. 8.13
b. 2.75
c. 3.67
d. 15.8
e. 1.32
c
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Which of the following statements about apparent and absolute magnitudes is true?
A) A star's absolute magnitude is the apparent magnitude it would have if it were at a distance of 10 parsecs from Earth. B) The magnitude system that we use now is based on a system used by the ancient Greeks over 2,000 years ago that classified stars by how bright they appeared. C) A star with an apparent magnitude of 1 appears brighter than a star with an apparent magnitude of 2. D) The absolute magnitude of a star is another measure of its luminosity. E) All of the above are true.
A box rests on the (horizontal) back of a truck. The coefficient of static friction between the box and the surface on which it rests is 0.24 . What maximum distance can the truck travel (starting from rest and moving horizontally with constant acceleration) in 3.0 s without having the box slide?
a. 14 m b. 11 m c. 19 m d. 24 m e. 29 m
A 30-kg object sitting at rest is struck elastically in a head-on collision with a 10-kg object initially moving at +3.0 m/s. Find the final velocity of the 30 kg object after the collision
a. -1.0 m/s c. +1.5 m/s b. +1.2 m/s d. +2.0 m/s
An organ pipe open at both ends has two successive harmonics with frequencies of 210 Hz and 240 Hz. What is the length of the pipe? The speed of sound is 344 m/s in air
A) 3.62 m B) 4.90 m C) 5.25 m D) 2.76 m E) 5.73 m