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A 5.0kg box is pulled horizontally with a 45-N force that makes angle of 40 degrees with the horizontal. The coefficient of kinetic friction of the surface is 0.20 What is the magnitude of the acceleration of the box?
A double speed trap is set up on a freeway. One police cruiser is hidden behind a billboard, and another is some distance away under a bridge. How far apart are the two cruisers
The emissivity of the human skin is 97.0 percent. Use 35.0 °C for the skin temperature and approximate the human body by a rectangular block with a height of 1.81 m, Calculate the power emitted by the human body
What should be coefficient of static friction
A boy tosses a football upward. If the football rises a vertical distance of 4.1 m and the boy catches it at the same point he released it
The escape velocity of a bullet from the surface of planet Y is 1759.0 m/s. Calculate the escape velocity from the surface of the planet X
0.5 kg of saturated vapor (H2O) at 1.5 bars is contained in a piston-cylinder device. Heat transfer in the amount of 150 kJ to the steam occurs and some work is done on the steam by a impellor. At the end of this process the steam is at 1.5 bars and ..
An engineer is given the job of designing the water system for a tall building. He decides to locate the pumps at ground level and feed the entire building from there. what must the pressure be at pump level
You are riding on a Jet Ski at some angle upstream on a river flowing with a speed of 2.8. Assume the Jet Ski is moving at a speed of 12 relative to the water. At what angle should you point the Jet Ski if your velocity relative to the ground is t..
A person, with his ear to the ground, sees a huge stone strike the concrete pavement. A moment later two sounds are heard from the impact: one travels in the air and the other in the concrete, and they are 6.60s apart. How far away did the impact ..
Two charges are separated by a distance d and exert mutual attractive forces F on each other. If the charges are separated by a distance of d/3, what are the new mutual forces? q1 = +2C and q2 = -2C
An electromagnetic wave with a frequency of 7.20×10^14Hz propagates with a speed of 2.30×10^8m/s in a certain piece of glass. Find the dielectric constant for glass at this frequency
A 5.20 g charcoal sample from anancient fire pit has a 14C activity of 63.0disintegrations/min. How old is the charcoal sample
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