Why is Hubble's Law called the top of the distance ladder?
What will be an ideal response?
Hubble's Law builds on the other distance measurement techniques, which are rungs on the distance ladder. Hubble's Law works at the very largest distances, making it the top of the ladder.
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A 400-W computer (including its monitor) is turned on for 8.0 hours per day. If electric energy costs 10¢ per kWh, how much does it cost to run the computer annually for a 365-day year?
A) $120 B) $1200 C) $15 D) $150
When a single boxcar in the freight yard hooks onto a stationary string of four boxcars, there is some kinetic energy lost. Which of the following could account for the missing energy?
A. Sound energy in the loud CLANG when they hook together and heat energy in the clamping mechanism between cars as it opens and then captures the fifth boxcar B. Heat energy in the clamping mechanism between cars as it opens and then captures the fifth boxcar C. Sound energy in the loud CLANG when they hook together
A 20-cm length of wire is held along an east-west direction and moved horizontally to the north with a speed of 3.0 m/s in a region where the magnetic field of the earth is 60 ?T directed 30° below the horizontal. What is the magnitude of the potential difference between the ends of the wire?
a. 36 ?V b. 18 ?V c. 31 ?V d. 24 ?V e. 21 ?V
What determines the smallest angular separation that two objects can have and, ideally, show up in a photograph as two separate objects?
a. How far away the objects are. b. The shutter speed of the camera. c. The size of the opening that lets the light into the camera lens and the wavelength of the light. d. Just the wavelength of the light. e. Just the size of the opening that lets in the light into the camera.