To make ice, water must first be cooled. The specific heat of water is 4,186 J/kg · °C. Approximately how much heat must be removed from 0.50 kg of water to change its temperature from 24°C to 5°C? *

0 J
19,900 J
39,800 J
79,500 J

Jessica places 1000 g of water at 20.0°C in an insulated cup. The specific heat capacity of water is 4.20 J/g · °C. What is the final temperature of the water if 5000 J of energy is added to the water in the insulated cup? *

20.1°C
20.5°C
21.2°C
25.0°C

Two blocks of zinc with different masses are at room temperature. Each block then absorbs the same amount of heat over 10 minutes. When the temperature of each block is then measured, block 1 is at a higher temperature than block 2. Which of the following statements most likely describes the zinc blocks? *

The mass of block 1 is less than the mass of block 2.
The mass of block 1 is greater than the mass of block 2.
The specific heat of block 1 is less than the specific heat of block 2.
The specific heat of block 1 is greater than the specific heat of block 2.

Dinate system, and a charge q = - 2.00 nc is placed s2 10 n> c. (a) what is the change in electric potential energy when the dipole moment of a molecule changes its orientation with respect to es from parallel to perpendicular? (b) at what absolute temperature t is the average translational kinetic energy 32 kt of a molecule equal to the change in potential energy calculated in part(: abovethistemperature,thermalagitationprevents the dipoles from aligning with the electric field.) placed in a uniform electric field e with magnitude 1.6 * 6 on the positive x-axis at x = 4.00 cm. (a) if a third charge q3 = +6.00 nc is now placed at the point x = 4.00 cm, y = 3.00 cm, find the x- and y-components of the total force exerted on this charge by the other two. (b) find the magnitude and direction of figure p21.62 ll uu 21.55 . torque on a dipole. an electric dipole with dipole moment ps is in a uniform external electric field es. (a) find the orientations of the dipole for which the torque on the dipole is zero. (b) which of the orientations in part (a) is stable, and which is unstable? (hint: consider a small rotation away from the equi- librium position and see what happens.) (c) show that for the stable orientation in part (b), the dipole’s own electric field tends to oppose the external field. 21.62 ..

Which graph represents motion with an object with positive velocity that is located at a position of 3 meters at a time of 0 seconds? a) a b) bb eliminate c) c d) d

An automobile steering wheel is shown. what is the ideal mechanical advantage? if the ama is 8, what is the efficiency of the steering wheel?