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An 80-N crate slides with constant speed a distance of 5.0 m downward along a rough slope that makes an angle of 30 ° with the horizontal. The work done by the force of gravity is?
If the coefficient of friction between the book and the wall is .35, explain how hard would she have to push in order to allow the book to slide down at constant speed?
A heavy piece of machinery is raised by sliding it a distance d = 15.0 m along a plank oriented at angle ? = 30° to the horizontal, How far is it moved vertically and horizontally
Ice of mass 48.5 g at -10.3° C is added to 188 g of water at 14.2° C in a 108 g glass container of specific heat 0.200 cal/g-°C, obtain the final temperature of the system
A 116 g insulated aluminum cup at 15°C is filled with 140 g of water at 50°C. After a few minutes, equilibrium is reached. Estimate the total change in entropy
The surface temperature of the start Betelgeuse is 3500K. Assume Betelgeuse radiates as a perfect blackbody. what is the energy of each of these photons
An elevator moves downward in a tall building at a constant speed of 4.35 m/s. Estimate the highest floor from which the bolt can fall
Light passes through a 230 lines/mm grating and is observed on a 1.0m wide screen located 1.3m behind the grating. Three bright fringes are seen on both sides of central maximum.
If a car travelling at 63 km/h will skid 18 m when its brakes lock, how far will it skid if it is travelling at 150 km/h while its brakes lock.
An ?-particle has a charge of +2e and a mass of 6.64 × 10-27 kg. It is accelerated from rest through a potential difference that has a value of 1.75 × 106 V, what are the radius of its circular path
Find out the magnetic induction at a point
The refractive index of a material is 2.58. What is the critical angle for a light ray
A faulty model rocket moves in the xy-plane (the positive y-direction is vertically upward), What is the horizontal displacement of the rocket when it returns to y=0
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