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Q. A 0.025kg golf ball moving at 23 m/s crashes through the window of a house in 2.0 10-4 s. After the crash, the ball continues in the equal direction with a speed of 10m/s. assume the force exerted on ball by the window was constant, what was magnitude of this force?
Q. A 5.7x10^2 kg hot-air balloon takes off from rest at the surface of the earth. The wind and lift forces take the balloon up, doing +9.7 x 10^4 J of work on the balloon in the procedure. At what height above the surface of the earth does the balloon have a speed of 7.50m/s?
A lead ball is dropped into a lake from a diving board 5 above the water. After entering the water, it sinks to the bottom with the constant velocity equal to the velocity with which it hit the water. The ball reaches the bottom 3.20 after it is f..
How much would an 80.0kg person weigh) on mars where an acceleration of gravity is 3.93m/s^2 and (b) on earth's moon where the acceleration of gravity is 1.63m/s^2.
A 100 percent efficient electric motor is lifting a 15N weight at 25cm/s. If the motor is connected to a 7V battery, how much current does it draw.
assuming the weight is evenly distributed.On a hot day in Las Vegas, an oil trucker loaded 37000 L of fuel. He encountered cold weather on the way to Utah, where the temperature was 23K lower than Las Vegas.
A certain car battery with a 12.0 V emf has an initial charge of 178 A•h. assume that the potential across the terminals stays constant until the battery is totally discharged, for how long in hours can it deliver energy at the rate of 115 W.
Use Gauss law to compute amount of charge
The heat of vaporization of ethyl alcohol is about 200 cal/g. If 2.3 kg of it were allowed to vaporize in a refrigerator, how many grams of ice will be formed from 0°C water.
how fast is the mass moving when leaves the spring. Two forces, and , act at a point. has a magnitude of 9.00 and is directed at an angle of 65.0 degrees above the negative x axis in the second quadrant. has a magnitude of 6.00 and is directed at a..
A 346-, uniform, 1.04- bar is suspended horizontally by two vertical cables at each end. Cable A can support a maximum tension of 506.0 without breaking, and cable B can support up to 436.0. You want to place a small weight on this bar. What is the h..
A force vector has a magnitude of 569 newtons and points at an angle 41o of below the positive x axis. What is (a) x scalar component and (b) y scalar component of the vector.
An alpha particle (charge 2e) is sent at high speed toward a gold nucleus. The electric force acting on alpha particle is 91 N when it's 2.00 x 10^(exponent)-14m away from the gold nucleus What is the charge on gold nucleus, as a whole number mult..
What is the volume of the bubble when it reaches just below the surface of the lake, where temperature is 20°C.
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