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A person pushes on a stationary 125 N} box with 69N at 30degrees below the horizontal, as shown in the figure. The coefficient of static friction between the box and the horizontal floor is 1.20. What is the normal force on the box?
A car of mass = 800 travelling at 45.0 enters a banked turn covered with ice. The road is banked at an angle, and there is no friction between the road and the car's tires. What is the radius of the turn if = 20.0 (Assume the car continues in unif..
You have been given 1.752 g of copper from which you are to fashion a wire whose resistance is 2.519 ohms. What will be the density of the wire you fashion
How much time is the stone in the air
A person is riding a bicycle, and its wheels have an angular velocity of 26.9 rad/s. Then, the brakes are applied and the bike is brought to a uniform stop. What is the anguar acceleration (in rad/s2) of each wheel
Illustration on Eratosthenes' process
A 85-kg person sits on a 3.7-kg chair. Each leg of the chair makes contact with the floor in a circle that is 1.4 cm in diameter
A block of mass m = 364 g is dragged with a string across a rough horizontal table. The string tension is T = 2.79 N, What is the power supplied by the force of friction
A. The rate of hydrogen fusion (proton-proton chain) near 10^7 K increases with temperature as T^5. If you raise the temperature of the hydrogen-burning core by 10 percent, how much does the hydrogen fusion energy increase?
You have an open tube that is 1.3m long. what is the fundamental frequency of the wavelength of the tube
A fire truck emitting a siren frequency of 1500 Hz speeds by you at 20.0 m/s (~45 mph). calculate the frequency of the siren as the engine approaches
There are many estimates of the number of stars in the universe. One estimate is that there are 1010 stars in the Milky Way galaxy, and that there are 1010 galaxies in the universe.
A playground merry-go-round of radiusR=2.00m has a moment of inertiaI=255kg·m2and is rotating at9.0rev/min about a frictionless vertical axle. What is the new angular speed of the merry-go-round
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