Which planet could an astronaut visit without the need for a spacesuit (and survive)?
A) the Moon
B) Mars
C) Mercury
D) Venus
E) None; an astronaut would need a spacesuit to survive a visit to any other planet in the solar system.
E
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Perhaps the most fundamental role that enzymes play in living cells is
A) attacking foreign bodies like bacteria and viruses B) carrying oxygen across cell membranes C) facilitating the replication of DNA and the reading of the genetic code D) the breaking down of more complex molecules
A student in the front of a school bus tosses a ball to another student in the back of the bus while the bus is moving forward at constant velocity. The speed of the ball as seen by a stationary observer in the street
A. is less than that observed inside the bus. B. is the same as that observed inside the bus. C. is greater than that observed inside the bus. D. may be either greater or smaller than that observed inside the bus. E. may be either greater, smaller, or equal to that observed inside the bus.
An AC generator consists of 6 turns of wire. Each turn has an area of 0.040 m2. The loop rotates in a uniform field (B = 0.20 T) at a constant frequency of 50 Hz. What is the maximum induced emf?
A. 13 V B. 2.4 V C. 3.0 V D. 15 V E. 4.8 V
Inside the nucleus, the strongest of the four fundamental forces is
A) the gravitational force. B) the weak nuclear force. C) the electromagnetic force. D) the strong nuclear force.