Velocity: A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. What was the average speed of the runner in m/s?
A. 14,200 m/s
B. 124 m/s
C. 3.95 m/s
D. 14.2 m/s
Answer: C
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If you draw a spacetime diagram, the worldline of an object that is traveling by you at constant speed is
A) vertical. B) horizontal. C) slanted. D) curved. E) a circle.
An astronaut is in an all-metal chamber outside the space station when a solar storm results in the deposit of a large positive charge on the station. Which statement is correct?
A. The astronaut must abandon the chamber immediately to avoid being electrocuted. B. The astronaut will be safe only if she is wearing a spacesuit made of non-conducting materials. C. The astronaut does not need to worry: the charge will remain on the outside surface. D. The astronaut must abandon the chamber if the electric field on the outside surface becomes greater than the breakdown field of air. E. The astronaut must abandon the chamber immediately because the electric field inside the chamber is non-uniform.
A certain fuse "blows" if the current in it exceeds 1.0 A, at which instant the fuse melts with a current density of 620 A/cm2. What is the diameter of the wire in the fuse?
A) 0.45 mm B) 0.63 mm C) 0.68 mm D) 0.91 mm
Volcanic eruptions may affect climate because volcanoes release sulfur compounds and small particles into the stratosphere
What will be an ideal response?