A coil to be operated in air has 200 loops in a length of 3 cm. What current is required to produce a flux density of 0.02 T?
What will be an ideal response?
Because the coil is in air there is little error in using the permeability of a vacuum.
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A 0.5-kg blob of clay moving at 2.0 m/s slams into a 4.0-kg blob of clay at rest. The speed of the two blobs stuck together after colliding is about
A) 1.1 m/s. B) 1.5 m/s. C) 2.5 m/s. D) none of the above
A photon of wavelength 29 pm is scattered by a stationary electron. What is the maximum possible energy loss of the photon? (mel = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s)
A) 7.0 keV B) 10 keV C) 12 keV D) 4.0 keV E) 6.1 keV
When you drop a rubber ball on the floor it bounces back. The force exerted on the ball to produce bouncing is by the
A) ball. B) floor. C) need more information
Which of the following best describes the meaning of "force"?
A) A body's force is the tendency of that body to continue moving once it is started moving. B) A force is a change in velocity. C) The force of a moving body is the distance the body travels divided by the time it takes to travel that distance. D) A body exerts a force on another body when the first body causes the second body to accelerate. E) The force that a body has is the amount of work that the body can do.