Once a protoplanet approached a mass of 15 Earth masses or so, it could begin to grow by gravitational collapse
Indicate whether the statement is true or false
True
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During each cycle of operation, a refrigerator absorbs 230 J of heat from the freezer and expels 356 J of heat to the room. How much work input is required in each cycle?
A) 712 J B) 586 J C) 460 J D) 310 J E) 126 J
The speed of a 2.0-kg object changes from 30 m/s to 40 m/s during a 5.0-s time interval. During this same time interval, the velocity of the object changes its direction by 90°. What is the magnitude of the average total force acting on the object during this time interval?
a. 30 N b. 20 N c. 40 N d. 50 N e. 6.0 N
Where does your body get the energy it uses to make your heart beat?
A) It comes from the radiative energy of the sunlight that hits your skin. B) It comes from the chemical potential energy of the food you eat. C) It comes from the thermal energy of the water you drink. D) It comes from the kinetic energy of the molecules in the air that you breathe in. E) It is created by your brain during the time that you rest or sleep.
The temperature at which ferromagnetic materials transform into paramagnetic materials is called the
A. Celsius temperature. B. Carnot temperature. C. crossover temperature. D. Curie temperature. E. chaos temperature.