What do you buy from the "power" company?
A) potential
B) power
C) current
D) energy
E) voltage
D
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A loop of gas following the magnetic field lines between sunspots' poles is a
A) prominence. B) coronal hole. C) coronal mass ejection. D) flare. E) ray.
Christie bought a 9 x 50 pair of binoculars for stellar observing. The 9 is the
A) f/number. B) aperture in cm. C) angular magnification. D) aperture in mm. E) f/number-1
A locomotive is pulling three wagons along a level track with a force of 100,000 N. The wagon next to the locomotive has a mass of 70,000 kg, the next one, 50,000 kg, and the last one, 80,000 kg. Neglect friction
What is the force between the 70,000-kg and 50,000-kg wagons? A) 35,000 N B) 40,000 N C) 50,000 N D) 60,000 N E) 65,000 N
A 500-N block, on a 30.0° incline, is being held motionless by friction. The coefficient of static friction between the block and the plane is 0.63 . The force due to friction is:
a. 0 N. b. 433 N. c. 250 N. d. 500 N. e. 354 N.