The reason that you do not observe a Doppler shift when you listen to the car radio while driving is that
A) the source and observer are moving at the same speed.
B) the air inside the car is moving at the same speed as the car.
C) the speed of the car is too slow compared to the speed of sound.
D) the speed of the car is too fast compared to the speed of sound.
E) there is a Doppler shift but we don't notice it.
A
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Projectile Motion: A boy kicks a football from ground level with an initial velocity of 20 m/s at an angle of 30° above the horizontal. What is the horizontal distance to the point where the football hits the ground if we neglect air resistance?
A. 20 m B. 35 m C. 18 m D. 60 m E. 30.0 m
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
Vectors 
and 
have equal magnitudes. Which statement is always true?
A.
+ = 0B.
- = 0C.
is perpendicular to + .D.
is perpendicular to+.E.
+ equals the magnitude of .A particle (charge = Q) is kept in a fixed position at point P, and a second particle (charge = q) is released from rest when it is a distance R from P. If Q = +2.0 mC, q = ?1.5 mC, and R = 30 cm, what is the kinetic energy of the moving particle after it has moved a distance of 10 cm?
A. 60 kJ B. 45 kJ C. 75 kJ D. 90 kJ E. 230 kJ
How many joules of energy are required to accelerate a 1.0-kg rock from rest to a speed of 0.866c? (c = 3.0 × 108 m/s)
A) 1.8 × 1017 J B) 9.0 × 1016 J C) 3.0 × 103 J D) 3.3 × 1016 J