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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Negatively charged particles in an atom are called ________.
A. protons B. neutrinos C. electrons D. positrons E. neutrons
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?
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
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