A 360-g metal container, insulated on the outside, holds 180.0 g of water in thermal equilibrium at 22.0°C. A 24.0-g ice cube, at the melting point, is dropped into the water,
and when thermal equilibrium is reached the temperature is 15.0°C. Assume there is no thermal energy exchange with the surroundings. For water, the specific heat is 4190 J/kg ? K and the heat of fusion is 3.34 × 105 J/kg. What is the specific heat of the metal of the container?
A) 1700 J/kg ? K
B) 970 J/kg ? K
C) 2300 J/kg ? K
D) 2800 J/kg ? K
E) 3300 J/kg ? K
A
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Which of the following statements describes a true observation that represents strong physical evidence that magnetic poles are not the same as electric charges? Select all answers that are both physically true and represent relevant evidence. (To select multiple answers using the back of the book, point to answers with multiple fingers.)
A. We describe magnetic poles as being north and south but charges as being positive or negative. B. A magnet does not exert force on a motionless charged particle, but another charged particle will. C. A magnet exerts force in a different direction on a motionless charged particle than a charged particle does. D. Magnetic fields are measured in teslas, but electric fields are measured in N/C. E. No one has seen an isolated magnetic pole. F. What do you mean? At the deepest level, electric charges and magnetic poles really are the same thing!
For the two resistors shown in the figure below, rank the currents at points a through f from largest to smallest
What would happen if Jupiter was suddenly replaced by a black hole with the same mass as Jupiter?
A) The orbits of the planets in our solar system would be unaffected. B) The other planets would slowly be pulled into Jupiter, but the Sun would be unaffected. C) The other planets and the Sun would slowly be pulled into Jupiter. D) The entire solar system would rapidly be sucked into the black hole.
An object is in uniform circular motion. Which of the following statements is true?
A. Velocity = constant B. Speed = constant C. Acceleration = constant