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you push a 20kg box on a wooden floor, downward to the right at an angle of 60degrees to the vertical, with a constant speed of .5m/s. The coefficient of the friction between the floor and the box is 0.7.
a. How hard did you push the box?
b. You pushed a distance of 50m. How much work did you do?
c. How much work did the other forces do?
d. What is work done by all the forces? Is the result consistent with energy principle?
The density of ice is 917 kg/m3, and the density of sea water is 1025 kg/m3. What is the weight of the heaviest bear that the ice can support without sinking completely beneath the water
An 800-kHz radio signal is detected at a point 4.5 km distant from a transmitter tower. What is the magnetic field amplitude of the signal at that point
A 1.00-kg glider attached to a spring with a force constant 9.0 N/m oscillates on a frictionless, horizontal air track. Find the period of the glider's motion
Two round rods, one steel and the other copper, are joined end to end. Each rod is 0.760 long and 1.35 in diameter, For the steel rod, what is the elongation
A 59 g ball attached to a spring with spring constant 2.9 N/m oscillates horizontally on a frictionless table. Its velocity is 15.4 cm/s when x=-4.79 cm. What is the ball's maximum acceleration
A 66 kg crate is dragged across a floor by pulling on a rope attached to the crate and inclined 15° above the horizontal. what is the magnitude of the initial acceleration of the crate
A parachutist bails out and freely falls 50 m. Then the parachute opens, and thereafter she decelerates at 1.8 m/s2. At what height does the fall begin
what is its potential energy relative to the bottom of the shaft? how fast will the payload be traveling when it reaches the bottom of the shaft? convert your answer to mph for a comparison to highway speeds.
A 0.15-kg of aluminum contains 0.2 kg of water. Initially, the water and the cup have a com- mon temperature of 18 0C, find the specific heat capacity of the unknown material
A 4.3-kg solid sphere, made of metal whose density is 4700 kg/m3, is suspended by a cord. Find the density of the liquid
An green hoop with mass mh = 2.7 kg and radius Rh = 0.17 m hangs from a string that goes over a blue solid disk pulley with mass md = 2.3 kg and radius Rd = 0.09 m. What is magnitude of the linear acceleration of the hoop
an inclinced plane mass is .5kg inclinced plane at 30 degrees is 6.40m long, a book has kinetic friction with the incline of .2, find out the speed at the bottom of the incline
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