Which of the following are electrically neutral?
A) protons
B) neutrons
C) electrons
D) ions
E) none of the above
Answer: B
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Convection is a mode of energy transport between materials that requires close contact between the atoms
Indicate whether the statement is true or false
Pressure in a Liquid: A circular window 30 cm in diameter in a submarine can withstand a net maximum force of 5.20 × 105 N without damage. What is the maximum depth in a fresh-water lake to which the submarine can go without damaging the window? The density of fresh water is 1000 kg/m3.
A. 680 m B. 740 m C. 1200 m D. 750 m
A 7.0-kg object is acted on by two forces. One of the forces is 10.0 N acting toward the east. Which of the following forces is the other force if the acceleration of the object is 1.0 m/s2 toward the east?
A) 6.0 N east B) 3.0 N west C) 12 N east D) 9.0 N west E) 7.0 N west
One star is emitting primarily visible light and another star is emitting primarily infrared light. Which star is hotter?
A) the star emitting infrared light B) the star emitting visible light C) Both stars are the same temperature. D) The temperature also depends on the radius of the star, so one can't decide based on the information provided.