The silver lining on the glass surfaces of a Thermos bottle reduces energy that is transferred by
A) conduction.
B) convection.
C) radiation.
D) friction.
E) none of the above
Answer: C
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The average distance from Earth to the Sun is _____
A) 1 AU B) 2 AU C) 3 AU D) 4 AU
When a 45-kg person steps on a scale in an elevator, the scale reads a steady 410 N. Which of the following statements must be true? (There could be more than one correct choice.)
A) The elevator is accelerating upward at a constant rate. B) The elevator is accelerating downward at a constant rate. C) The elevator is moving upward at a constant rate. D) From the given information, we cannot tell if the elevator is moving up or down.
Which of the following statements is currently believed to be true?
a. Electricity is caused by magnetic current loops at the atomic level. b. Magnetism is caused by electric current loops at the atomic level. c. All electric fields are produced by moving magnetic poles. d. Stationary electric charges produce magnetic fields. e. Steady magnetic fields create electric fields.
A 5.0-g lead bullet traveling in 19.0°C air at 300 m/s strikes a flat steel plate and stops. What is the final temperature of the lead bullet? (Assume the bullet retains all heat.) The melting point of lead is 327°C. The specific heat of lead is 0.128 J/g/°C. The heat of fusion of lead is 24.5 J/g
a. 278°C b. 186°C c. 445°C d. 327°C e. 371°C