Which of the following statements is true of the protons in an atom?
A) They are electrically neutral.
B) They are positively charged.
C) They lack an electric field around them.
D) They are made up of multiple neutrons.
B
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The Hubble Space Telescope is famous because, at least at the time of its launch, it was the largest visible light telescope ever built
Indicate whether the statement is true or false
The Sun is a slightly variable star. What if the surface temperature of the Sun were to increase from 6 000 K to 6 100 K, what would be the increase in total power radiated assuming no other changes such as radius or emissivity?
a. 1.6% b. 6.8% c. 3.4% d. 14%
The frictional force of the floor on a large suitcase is least when the suitcase is
a. pushed by a force parallel to the floor. b. dragged by a force parallel to the floor. c. pulled by a force directed at an angle q above the floor. d. pushed by a force directed at an angle q into the floor. e. turned on its side and pushed by a force parallel to the floor.
A 300-g glass thermometer initially at 25°C is put into 200 cm3 of hot water at 95°C. Find the final temperature (in °C) of the thermometer, assuming no heat flows to the surroundings. (The specific heat of glass is 0.2 cal/g×°C.)
a. 52 b. 68 c. 89 d. 79 e. 36