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What is better to warm up in a cold night a kg of hot water at 700 C or a kg of gold at the same temperature? Why? If we assume that the gold will protect you from the cold for about 10 minutes, how long would the water last?
A rocket with mass 1000kg accelerates upwards at a rate of 20m/s2. What is the net force acting on the rocket as it is rising
The person shown below is pushing on a refrigerator that sits on a level floor. Assume the floor is very slippery so that the only horizontal force on the refrigerator is due to the person. find the magnitude of the refrigerator's acceleration
question a jetliner has a mass of 1.1 x 105 kg and flies at a speed of 120 ms. a find the value of its momentum. b if
A sample of hydrogen atoms is irradiated with light of wavelength 50 nm, what is the kinetic energy (in electron volts) of these photoelectrons
Calculate the amount of heat loss though a glass window made of a single pane of glass 0.100 in. thick, if the temperature inside the room is 70F and outside is 32 F
Consider a flat-plate solar collector placed horizontally on the flat roof of a house. The collector is 5 ft wide and 15 ft long, and the average temperature of the exposed surface of the collector is 100°F.
Suppose a graduated cylinder is filled up to the 50 mL mark with dry sand. Then suppose that 30 mL of water is poured into the cylinder and the water level.
q1. a typical major league fastball is thrown at about 99 mph and with a spin rate of 103 rpm. if the distance between
At a soft drink bottling plant, a horizontal section of pipe carrying citric acid in liquid form goes from a cross-sectional area of 8.00 cm2, determine the liquid flow speed and the liquid pressure
Explain why you cannot measure the focal length directly for a diverging lens. Using no more than four sentences, explain why the technique of placing.
A 1.0 kg ball and a 2.0 kg ball are connected by a 1.0-m-long rigid, mass less rod. What torque will bring the balls to a halt in 5.0s
two trains are traveling toward each other in still air at 26.0 ms relative to the ground. one train is blowing a
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