Solar houses use a variety of energy storage devices to retain the thermal energy absorbed during the day so that it can be released during the night
Suppose that you were to use a device of this kind to produce steam at 100°C during the day, and then allow the steam to cool to 0°C and freeze during the night. How many kilograms of water would be needed to store 20.0 kWh of energy in this way? The latent heat of vaporization of water is 22.6 × 105 J/kg, the latent heat of fusion of water is 33.5 × 104 J/kg, and the specific heat of water is 4186 J/kg ? K. A) 12.4 kg
B) 23.9 kg
C) 35.7 kg
D) 42.6 kg
E) 54.2 kg
B
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A 40.0-kg suitcase is being pulled along the ground by means of a strap which exerts a force of 10.0 N at an angle of 43.0° above the horizontal. What is the normal force exerted by the ground?
A) 17.1 N B) 15.7 N C) 385 N D) 272 N E) 398 N
Which of the following best describes the nature and origin of the atmospheres of the Moon and Mercury?
A) They have thin tropospheres only, with gas coming from evaporation and sublimation. B) They have thin exospheres only, with gas coming from impacts of subatomic particles and photons. C) They have only small amounts of gas, all of which is leftover from outgassing long ago. D) They have very thin atmospheres produced by outgassing, but still have the layers of a troposphere, thermosphere, and exosphere.
An electric heater draws an average power of 1100 Watts when plugged into a 110 V-rms outlet. Calculate the resistance of the heater and the rms current
a. 11?, 10 A (rms) b. 110?, 10 A (rms) c. 10?, 11 A (rms) d. 10?, 110 A (rms) e. 0.09?, 11 A (rms)
The focal lengths of the objective and the eyepiece in a microscope are 0.290 cm and 2.50 cm, respectively. An object is placed 0.300 cm from the objective
The image of this object is viewed with the eyepiece adjusted for minimum eyestrain (image at the far point of the eye) for a person with normal vision. What is the distance between the objective and the eyepiece? A) 9.85 cm B) 10.1 cm C) 10.4 cm D) 11.2 cm E) 11.5 cm