A lens that is thicker at the center than the edges
a. is a converging lens
b. is a diverging lens
c. always forms a real image
d. always forms a virtual image
e. none of the above
A
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Why did these astronomers take so many different pictures of the same patch of sky?
A: To "top" a previous study by rival astronomers, who took slightly fewer images. B: Galaxies have brightnesses that vary over hours or days, and they needed to be sure to get roughly equal light from all of them. C: To average over many images and keep only the consistent object details, filtering out random single-exposure events like charged particles from the solar wind. D: Needed a separate image for every nanometer-increment wavelength from 350nm to 800nm, to compile the final full-color image. E: It's not NASA's fault that pulsar in the foreground kept blinking!
The Earth has a radius of about 6,000 km. How long would it take for an object traveling at the speed of light to circle the earth? (Recall that the speed of light is 300,000 km/s)
A) 1/300,000 of a second (0.0000033 s) B) 1/ 6000 of a second (0.00015 s) C) 1/2 of a second (0.5 s) D) 1/50 of a second (0.02s)
A certain Carnot heat pump transfers energy from the outside of a house, where the temperature is -15°C, to the inside of a room where the temperature is 21°C
If this heat pump runs off of electricity, what is the minimum rate at which it uses electrical energy to deliver 150 W to the inside room?
A 20-? resistor and a 30-? resistor are wired in parallel and connected to a 9.0-V battery
a. How much current is drawn from the battery? b. How much power is dissipated in the circuit?