An electric toaster operating on 120 volts draws a current of 9 amperes. What is the resistance of the toaster?
13.3 ohms
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Moonquakes on the Moon were detected by
A) the radar observations over time from Earth. B) the seismographs left these by the Apollo astronauts. C) laser beams reflected off mirrors left on the Moon by Apollo missions. D) seismographs attached to the Russian Lunar rovers. E) telescopic observations of lunar landslides.
Video 2 (Chapter 19): If you have a short focal length converging lens what can be said about the power of the lens?
A. The power is large and positive B. The power is small and positive C. The power is small and negative D. The power is large and negative.
Consider a merry-go-round which makes 20. revolutions in 4.0 minutes. (a) What is the average angular speed in radians/s? (b) For a child 3.5 m from the center, how far does he travel in the 4.0 minutes?
What will be an ideal response?
On a sunny day at the beach, the reason the sand gets so hot and the water stays relatively cool is attributed to the difference in which property between water and sand?
a. mass density b. specific heat c. temperature d. thermal conductivity