A current that is sinusoidal with respect to time is referred to as
A)
a direct current.
B)
an alternating current.
B
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Which of the following statements concerning resistors that are wired in parallel is true?
a) The current through each resistor is necessarily the same. b) The equivalent resistance for the resistors in the circuit is the sum of the individual resistances. c) The voltage across each resistor is necessarily the same. d) The equivalent resistance for the resistors in the circuit is the product of the individual resistances. e) The equivalent resistance for the resistors in the circuit is the average of the individual resistances.
A wind of velocity 10 m/s is blowing through a wind generator with blade radius 5.00 meters. What is the maximum power output if 30.0% of the wind's energy can be extracted? ?air = 1.25 kg/m3.
A. 7.20 kW B. 14.7 kW C. 21.3 kW D. 29.4 kW E. 39.6 kW
A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the car. During the collision
A) the force on the truck due to the collision is slightly greater than the force on the car. B) the force of on the truck due to the collision is exactly equal to the force on the car. C) the force on the car due to the collision is much greater than the force on the truck. D) the car and the truck have the same magnitude acceleration.
Roughly how many stars are in the Milky Way Galaxy?
A) 1 billion B) 100 billion C) 10 billion D) 100 million E) 100 trillion