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A person gives a box a shove so that it slides up a ramp, then reverses its motion and slides down. what is the direction of the force of friction?
A cork on the surface of a pond bobs up and down two times per second on ripples having a wavelength of 9.20 cm. how long does it take a ripple passing the cork to reach the shore
What is the lift (in newtons) by reason of Bernoulli's principle on a wing of area 77 m^2 if the air passes over the top and bottom surfaces at speeds of 270 m/s and 140 m/s, correspondingly.
A lens with a refrective index of 1.5 is coated with a material of refractive index of 1.2 in order to minimize the reflection. what is the thinnest possible coating
If the bullet has a mass of 21.0 g and a speed of 235 m/s, explain how high will the block rise into the air after the bullet becomes embedded in it?
Calculate the smallest amount of kinetic energy the electron must have in order to leave its circular orbit and move to infinity far from the proton
The uncertainty in a proton's position is 0.17 nm. What is the kinetic energy of a proton whose momentum is equal to this uncertainty
A 21 kg suitcase is being pulled with constant speed by a handle that is at an angle of 30 degrees above the horizontal. What was the mass of the dog food
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
Light of wavelength 730 nm illuminates a pair of slits separated by 0.200 mm. determine the distance between the first and second dark fringes
One end of a brass bar is maintained at 305 oC, while the other end is kept at a constant, but lower, temperature. What is the temperature of the bar at a point 0.129 m from the hot end
A solid ball and a hollow ball, each with a mass of 2.29 kg and radius 0.115 m, start from rest and roll down a ramp of length 2.77 m at an incline of 32.7°
a 50 kg trunk is pushed 6 m along a level floor at a constant speed of 4.2m/s.if the coefficient of friction is 0.20, calculate the work done by the applied force
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