A 100-W lamp glows brighter than a 25-W lamp. The electric resistance of the 100-W lamp is
A) less.
B) greater.
C) the same.
Answer: A
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What are the Magellanic Clouds?
A) two small galaxies that probably orbit the Milky Way Galaxy B) two nebulae located in the disk of the Milky Way Galaxy and visible only from the Southern Hemisphere C) star-forming clouds found in the constellation Orion D) the clouds of dust and gas found interspersed in many places throughout the Milky Way Galaxy
A modern version of Joule's experiment has you turn a crank attached to an 85.0 g aluminum cylinder. A belt exerts a frictional torque on the cylinder of 1.50 Nm. The specific heat of aluminum is 900 J/(kg•K)
How many turns of the crank are necessary to raise the temperature of the aluminum by 40 C°? A) 325 B) 650 C) 900 D) 975 E) 1300
A 600-kg car is going around a banked curve with a radius of 110 m at a speed of 24.5 m/s. What is the appropriate banking angle so that the car stays on its path without the assistance of friction?
A) 29.1° B) 13.5° C) 33.8° D) 56.2° E) 60.9°
What are the Magellanic Clouds? What happened in the LMC in 1987?
What will be an ideal response?