In spite of the fictional exploits of the starship Enterprise, "Relativity" teaches us that the maximum possible speed is what? (hint: warp = v/c)
A) "warp" 0
B) "warp" 1
C) "warp" 10
D) "warp" infinity
E) "warp"
B
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An astronaut in orbit around Earth drops her pen, and it floats gently next to her hand. Why does it not fall to the floor?
A. There is no gravity in space. B. The net force on the pen is zero. C. The gravitational pull is very weak at typical altitudes for orbiting spacecraft. D. Objects in orbit have no mass. E. All objects in the spacecraft are falling toward Earth at the same rate.
A 10.0-m-long copper wire with cross-sectional area 1.25 × 10^–4 m2 is bent into a square loop, and then connected to a 0.25-V battery. The loop is then placed in a uniform magnetic field of magnitude 0.19 T. What is the maximum torque that can act on this loop? The resistivity of copper is 1.70 × 10^–8 ?·m
a. 2.2E+2 N·m b. 1.8E+2 N·m c. 9.7E+2 N·m d. 5.6E+2 N·m
A galvanometer with a coil resistance of 80 ? deflects full-scale for a current of 2.0 mA. What series resistance is required to convert it to a voltmeter reading full scale for 200 V
A) 100 m? B) 13 M? C) 250 k? D) 0.80 m? E) 100 k?
Which of the following statements about the Sun is an inference from a model, not an observation?
A) The photosphere emits visible light. B) The Sun emits neutrinos. C) The convection zone is cooler than the radiation zone. D) The corona is hotter than the photosphere.