___________ is (are) observed when light from a distant quasar travels past a massive galaxy between us and the quasar, and this light is focused to form two or more images of the same quasar
a. A double-lobed radio galaxy
b. Superluminal expansion
c. The gravitational lens effect
d. A blazar
e. Gravitational waves
c
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A 1200-kg pick-up truck traveling south at 15 m/s suddenly collides with a 750-kg car that is traveling east. The two vehicles stick together and slide along the road after colliding
A highway patrol officer investigating the accident determines that the final position of the wreckage after the collision is 25 m, at an angle of 50° south of east, from the point of impact. She also determines that the coefficient of kinetic friction between the tires and the road at that location was 0.40. What was the speed of the car just before the collision? A) 20 m/s B) 4.8 m/s C) 14 m/s D) 23 m/s E) 17 m/s
A 0.25 kg ideal harmonic oscillator has a total mechanical energy of 4.0 J. If the oscillation amplitude is 20.0 cm, what is the oscillation frequency?
A) 4.5 Hz B) 1.4 Hz C) 2.3 Hz D) 3.2 Hz
Two spaceships are approaching one another, each at a speed of 0.28c relative to a stationary observer on Earth. What speed does an observer on one spaceship record for the other approaching spaceship?
What will be an ideal response?
A circular coil (radius = 0.40 m) has 160 turns and is in a uniform magnetic field. When the orientation of the coil is varied through all possible positions, the maximum torque on the coil by magnetic forces is 0.16 N / m when the current in the coil is 4.0 mA. What is the magnitude of the magnetic field?
a. 0.37 T b. 1.6 T c. 0.50 T d. 1.2 T e. 2.5 T