The acceleration due to gravity on the Moon's surface is one-sixth that on Earth. An astronaut's life support backpack weighs 250 lb on Earth. What does it weigh on the Moon?
a. 1 500 lb
b. 250 lb
c. 256 lb
d. 41.7 lb
e. 244 lb
d
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A long straight wire (diameter = 2.0 mm) carries a current of 40 A. What is the magnitude of the magnetic field 1.5 mm from the axis of the wire?
a. 3.0 mT b. 12 mT c. 5.3 mT d. 7.4 mT e. 8.0 mT
A 0.50-m long solenoid consists of 1 000 turns of copper wire wound with a 4.0 cm radius. When the current in the solenoid is 18 A, the magnetic field at a point 1.0 cm from the central axis of the solenoid is
a. 0.090 mT. b. 0.36 mT. c. 23 mT. d. 36 mT. e. 45 mT.
The Perseid meteor shower is named after a(n) _____
A) comet B) asteroid C) constellation D) star
A proton in a certain particle accelerator has a kinetic energy that is equal to its rest energy. What is the TOTAL energy of the proton as measured by a physicist working with the accelerator? (c = 3.00 × 108 m/s, mproton = 1.67 × 10-27 kg)
A) 5.69 × 10-11 J B) 1.50 × 10-10 J C) 2.07 × 10-10 J D) 3.01 × 10-10 J E) 8.77 × 10-10 J