A 40-turn circular coil (radius = 4.0 cm, total resistance = 0.20 ?) is placed in a uniform magnetic field directed perpendicular to the plane of the coil. The magnitude of the magnetic field varies with time as given by B = 50 sin(10 ?t) mT where t is measured in s. What is the magnitude of the induced current in the coil at 0.10 s?
a. 50 mA
b. 1.6 A
c. 0.32 A
d. zero
e. 0.80 A
b
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Doppler Effect: In many cartoon shows, a character runs off a cliff, realizes his predicament, and lets out a scream. He continues to scream as he falls. If the physical situation is portrayed correctly, from the vantage point of an observer at the foot of the cliff, the pitch of the scream as he falls should be
A. higher than the original pitch and constant. B. higher than the original pitch and increasing as he falls. C. lower than the original pitch and constant. D. lower than the original pitch and decreasing as he falls. E. It is impossible to predict.
The average intensity of the sunlight in Miami, Florida, is 1060 W/m2. What is the average value of the force exerted on a 16m2 surface that absorbs this light?
A) 7.83 × 10-5 N B) 1.63 × 10-5 N/m2 C) 2.61 × 10-5 N D) 5.65 × 10-5 N E) 0.204 × 10-5 N
Which of the following is the best object to use as a point of reference for describing the location of the parked car?
A. the bird B. the streetlight C. the store D. the tree
A 2.0-kg block slides on a frictionless 15° inclined plane. A force acting parallel to the incline is applied to the block. The acceleration of the block is 1.5 m/s2 down the incline. What is the applied force?
a. 8.1 N down the incline b. 3.0 N down the incline c. 2.1 N up the incline d. 3.0 N up the incline e. 8.1 N up the incline