The maximum induced emf in a generator whose coils are rotating at 240 rpm is 35 V. If, instead, it is desired to generate a maximum emf of 45 V but with half the magnetic field, what rotation rate must be used?
A. 380 rpm
B. 190 rpm
C. 310 rpm
D. 165 rpm
E. 610 rpm
E. 610 rpm
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What is the lithosphere?
a. another name for a planet’s crust b. the crust plus the mantle c. a relatively rigid outer layer of rock that lies above less rigid rock below d. the boundary between the core and mantle
A ball is thrown upward and caught when it returns. Compared with its initial speed and in the presence of air resistance, the speed with which it is caught is
A) more. B) less. C) the same. D) need more information.
A small rubber ball is thrown at an initially stationary bowling ball on a frictionless surface. The rubber ball makes a one-dimensional elastic collision and bounces back along the same line. After the collision, compared to the bowling ball, the rubber ball has
1.a larger magnitude of momentum and more kinetic energy. 2.a smaller magnitude of momentum and less kinetic energy. 3.a smaller magnitude of momentum and more kinetic energy. 4.the same magnitude of momentum and more kinetic energy.
Which of the following is not a pattern of motion in our solar system?
A) Planets all orbit in the same direction. B) Planets all rotate in the same direction. C) Planets all orbit the same direction as the Sun's spin. D) Large planets all have many moons orbiting them.