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You push with a horizontal force of 56.0 against a 25.0 box, pressing it against a rough wall to hold it in place. The coefficients of kinetic and static friction between this box and the wall are 0.300 and 0.500, respectively.
A) What is the friction force on the box?
B) How hard would you have to press for the box to slide downward with a uniform speed of 10.5 cm/s ?
An object of mass m is dropped at t = 0 from the roof of a building of height h. While the object is falling, a wind blowing parallel to the face of the building exerts a constant force F on the object. (a) At what time t does the object strike th..
A 0.280 kg croquet ball makes an elastic head-on collisionwith a second ball initially at rest. The second ball moves offwith half the original speed of the first ball. What is themass of the second ball
An uncharged nonconductive hollow sphere of radius 11.0 cm surrounds a 16.0 µC charge located at the origin of a cartesian coordinate system. A drill with a radius of 1.00 mm is aligned along the z axis, and a hole is drilled in the sphere. Calculate..
In a certain binary-star system, each star has the same mass which is 6.0 times of that of the Sun, and they revolve about their center of mass. What is their period of revolution in years
A 0.240 kg block on a vertical spring with spring constant of 4.20 103 N/m is pushed downward, compressing the spring 0.045 m. How high does it rise above the point of release
The moon orbits the earth at a distance of 3.85 x 10^8 m.Assume that this distance is between the centers of the earth andthe moon and that the mass of the earth is 5.98 x 10^24 kg. Find the period (in days) for the moon’s motion around the earth.
A 2.10 kg mass attached to a spring oscillates with a period of 0.375 s and an amplitude of 20.5 cm. Find the total mechanical energy of the system
A cockroach of mass m lies on the rim of a uniform disk of mass 7.00 m that can rotate freely about its center like the merry-go-round. At first the cockroach and disk rotate together with an angular velocity of 0.220 rad/s. Then the cockroach walks ..
The resistance of a 100-cm wire of cross sectional area 2 × 10-6 m2 is 400 ?. What is the resistivity of the material of this wire
A certain corner of a room is selected as the origin of a rectangular coordinate system. what is the distance of the fly from the corner of the room
An object is subject to a restoring force F = 8x3, How much work must be done to move the object from x = 0.10 to x = 0.47 m
Two 4.0kg masses are 1.0m apart on a frictionless table. Each has 1.0?C of charge. What is the initial acceleration of each mass if they are released and allowed to move
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