A swimming pool heater has to be able to raise the temperature of the 30,000 gallons of water in the pool by 10.0°C. How many kilowatt-hours of energy are required? (One gallon of water has a mass of approximately 3.79 kg and the specific heat of water is 4186 J/kg • °C.)
a. 1960 kWh
c. 1130 kWh
b. 1320 kWh
d. 216 kWh
B
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You push downward on a box at an angle 25° below the horizontal with a force of 750 N. If the box is on a flat horizontal surface for which the coefficient of static friction with the box is 0.76,
what is the mass of the heaviest box you will be able to move? A) 59 kg B) 68 kg C) 54 kg D) 82 kg
Spherical Mirrors: A cell phone that is 8.90 cm tall is placed in front of a convex mirror. The image of the phone is 7.80 cm tall and is located 14.8 cm from a mirror. What is the mirror's focal length?
A. -120 cm B. -105 cm C. +16.9 cm D. -13.0 cm E. +120 cm
A(n) ______ is data or information presented visually, such as in a chart or pyramid.
A. infographic B. carousel C. clip art D. animation
To date, we've found few planets orbiting their stars at distances comparable to the distances of the jovian planets in our solar system. Why do astronomers think this is the case?
A) We have not yet been searching for planets at such distances for a long enough time. B) Planets at such distances are extremely rare. C) No known method can detect planets at such large distances. D) Planets at such distances are probably low in mass.