The light from Polaris is 24.2 times less intense than the light received from Sirius. Which star is the truly brighter star, that is, emitting more visual light at its surface?
a. Polaris b. Sirius
c. Neither, they emit the same amount at their surfaces. d. This cannot be determined based upon the information given.
d
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A 12 ohm resistor and a 24 ohm resistor are connected in series with a 6.0 V battery. The correct statement is
A) the voltage difference between the ends of each resistor is the same. B) the power dissipated in each resistor is the same. C) the current in each resistor is the same. D) the smaller resistor carries the larger current.
Lighting is a place where lots of energy can be saved
What will be an ideal response?
Density: A porch roof that slopes upward at 45° measures 3.0 m × 5.0 m. It is covered with a slab of insulating material that is 2.0 cm thick. If the density of the insulation is 15 kg/m3, what is the weight of the insulation, in pounds, on the roof? (1.00 kg weighs 2.2 lb and density is mass per unit volume.)
A. 4.5 lb B. 9.0 lb C. 20 lb D. 990 lb E. 9.9 lb
A space station out beyond the solar system is rotating with constant angular velocity. A spaceship heading into the station along a diameter of the station, uses its rockets to brake, and then docks inside the station at its center. When the spaceship docks, the angular momentum of the system consisting of the station and ship
a. is less than the original angular momentum of the station. b. is the same as the original angular momentum of the station. c. is greater than the original angular momentum of the station. d. is less than the original angular momentum of the station, but the angular velocity increases. e. is greater than the original angular momentum of the station, but the angular velocity decreases.