The two headlights of a car are wired:
1.in series with each other.
2.in parallel.
3.neither in series or in parallel.
4.It is impossible to tell.
2
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A toaster is rated at 800 W when operating at 120 V dc. What is the resistance of its heating element?
A) 16 ? B) 18 ? C) 6.7 ? D) 0.15 ?
The "close encounter hypothesis" suggested that the planets formed after a near-collision between our Sun and another star. If this hypothesis were correct, which of the following would be true?
A) Planetary systems would be very rare. B) Planetary systems would be very common. C) Most planetary systems would have their jovian planets closer to their stars and their terrestrial planets farther from their stars. D) Most planetary systems would have the same number of planets as our own. E) All planetary systems would be at least 4 billion years old.
Imagine yourself in a universe that is exhibiting a blue shift. This must mean:
it's expanding much faster than our Universe. it's expanding, but in a jerky fashion. it's collapsing. it's in a steady state, neither expanding nor collapsing. there's no such thing as a blue shift of light waves.
A rocket is traveling away from Earth at 90% the speed of light. The captain turns on a laser light
What is the speed of the light as measured by an Earth-based astronomer if the captain aims the laser (a) directly forward or (b) directly backward?