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A box is sliding across a board that make an angle of 15 degrees with the horizontal. The box is sliding down the incline. The coefficient of kinetic friction between the box and the floor is 0.35. What is the acceleration of the box?
A swimmer bounces straight up from a diving board and falls feet first into a pool. What is her velocity when her feet hit the water
One side of the roof of a building slopes up at 34.0°. A student throws a Frisbee onto the roof. It strikes with a speed of 15.0 m/s and does not bounce, but slides straight up incline. The coefficient of kinetic friction between plastic and roof is ..
An object is 2 m from the front side of a 1 m focal lenth converging lens. A second converging lens with focal length 2 m is placed 1 m from the first on the opposite side from the object. What is the new magnification
A uniform plank of length 5.0 m and weight 225 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support. To what distance x can a person who weighs 415-N walk on the overhanging part of the plank before it just ..
Two 3 cm long parallel wires in a handheld calculator are 1 mm apart. The currents are in the same direction and have values 0.5 µA and 2.2 µA, respectively
A tennis player swings her 1000 g racket with a speed of 12 m/s. She hits a 60 g tennis ball that was approaching her at a speed of 24 m/s. How fast is her racket moving immediately after the impact
You hit a 0.2 kg golf ball up at 40o from the horizontal. It travels for 4.86 s and stops on an elevated green 10 m above its initial height traveling down at an angle of 35.4o below the horizontal
In a liquid with a density of 1450kg/m3 , longitudinal waves with a frequency of 390Hz are found to have a wavelength of 7.50m
A heavy stone of mass m is hung from the ceiling by a thin 8.25-g wire that is 65.0 cm long. When you gently pluck the upper end of the wire, What is the mass m of the stone
(a) What is the x component of the net electrostatic force on particle 3. (b) What is the y component of the net electrostatic force on particle 3
Suppose an object is placed 6 cm in front of a lens that has a focal length of 4 cm. Where is the image located? What are the magnification and the character of the image
A cube of edge length a in free sapace is charged over its volume with a charge density p(x)=p0 *sin(pi*x/a), Compute the total charge of the cube
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