If you throw a ball straight downward (in the absence of air resistance), after leaving your hand its acceleration is
A) less than 10 m/s2.
B) 10 m/s2.
C) greater than 10 m/s2.
Answer: B
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The temperature inside a Carnot refrigerator placed in a kitchen at 22.0°C is 2.0°C. The heat extracted from the refrigerator is 89 MJ/h. What power is needed to operate this refrigerator?
A) 1.7 kW B) 1.8 kW C) 1.5 kW D) 1.9 kW E) 1.6 kW
How do isotopes of a given element differ?
a. They have different mass numbers. b. They have different neutron numbers. c. They have different atomic numbers. d. They have different quantum numbers. e. none of the above
A container is filled with water, and the pressure at the bottom of the container is P. Then the container is emptied halfway and topped off with oil of density 0.80 × 10^3 kg/m3, which floats on top of the water. What is the pressure at the bottom of the container now?
a. a pressure < P b. the same pressure P c. a pressure > P d. This is unable to be determined with the information given.
When the box hits the floor its kinetic energy is converted into internal energy
Indicate whether the statement is true or false