Arnold Strongman wearing socks and Suzie Small in gym shoes have a tug-of-war on a polished floor. The likely winner is
A) Arnold.
B) Suzie.
C) neither, a tied score
D) no basis for predicting
Answer: B
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In an electric furnace used for refining steel, the temperature is monitored by measuring the radiant power emitted through a small hole in the wall of the furnace, of area 0.5 cm2
This hole acts like a perfect blackbody radiator having the same temperature as the interior of the furnace. If the temperature of the furnace (and therefore of the hole) is to be maintained at 1650°C, how much power will the hole radiate? A) 20 W B) 30 W C) 40 W D) 50 W
Negatively charged particles in an atom are called ________.
A. protons B. neutrinos C. electrons D. positrons E. neutrons
An electron is traveling at 0.85c. What is its mass? (The rest mass is 9.11 × 10-31 kg.)
A) 1.4 × 10-29 kg B) 7.2 × 10-30 kg C) 1.7 × 10-30 kg D) 2.4 × 10-30 kg E) 4.2 × 10-30 kg
Astronomers observe huge bubbles of hot gas, some over a thousand light years across, in the Milky Way. What is their cause?
What will be an ideal response?