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How long would a 2.90 kW space heater have to run to put into a kitchen the same amount of heat as a refrigerator (coefficient of performance = 2.68) does when it freezes 1.73 kg of water at 18.8°C into ice at 0°C?
In reaching her destination, a backpacker walks with anaverage velocity of 1.01 m/s, due west. How far east did she walk
An athlete starts at point A and runs at a constant speed of 6m/s around a round track 100 m in diameter, what is x component of this runner's average velocity between points A and B.
A particle with a charge of -1.5uC and a mass of 2.5x10-6 kg is released from rest at point A and accelerates toward point B, arriving there with a speed of 42 m/s. The only force acting on the particle is the electric force. (a) Which point is at..
A 1500 kg Prius and a 2400 kg Ford F150 pickup truck are approaching an unmarked intersection. What is the speed of the Ford at the moment of impact
A tuning fork vibrates at a frequency of 520 Hz. An out-of-tune piano string vibrates at528 Hz. How much time separates successive beats
A submerged scuba diver looks up toward the calm surface of a freshwater lake and notes that the Sun appears to be 32 degrees from the vertical. The diver's friend is standing on the shore of the lake.At what angle above the horizon does the friend s..
The electric potential energy stored in the capacitor of a defibrillator is 92 J, and the capacitance is 180 ?F. What is the potential difference across the capacitor plates
A rectangular plate has a length of (20.4 0.2) cm and a width of (8.7 0.1) cm. Calculate the area of the plate
how is the graph of the total volume of a bathtub while the water inflow rate follows a seesaw pattern for half of the time and the similar pattern for outflows on the other half.
A sled slides down a hill 45 meters high with a slope of 25o. The total mass of the sled plus contents is 247 kg. find the velocity of the sled at the bottom
In order to view the craters of the Moon, you construct a refracting telescope from a lens with focal length 92.3 cm as its objective and a 14.3-cm focal length lens as its eyepiece
in 1993 the radius of hurricane emily was about 350 kmh. the wind speed near the center eye of the hurricane whose
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