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Q. A 260-kg piano slides 4.2m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40.
Determine the force exerted by man.
A space station, in the form of a wheel 100m in diameter, rotates to supply an "artificial gravity" of 3.7m/s2 for persons who walk around on inner wall of the outer rim. Find out the rate of rotation of the wheel (in revolutions per minute) that ..
An airtight box has a removable lid of area 1.10 multiplied by 10-2m2 and negligible weight. The box is taken up a mountain where the air pressure outside the box is 0.80 multiplied by 105 Pa.
What power is dissipated in a single light. A proton is fixed in place. An electron is released from rest and allowed to collide with the proton. Then the roles of the proton and electron are interchanged, and same experiment is repeated. Which is ..
A particle of mass m moves next to the x axis. Its position varies with time according to x=(3m/s^3)t^3-(4m/s^2)t^2.
Find out the distance between the point of firing and the point at which the 2.6-kg fragment strikes the ground.
A subway train has three cars, each weighing 1.20 x 10^5 N. The frictional force on each car is 103 N, and the first car, acting as an engine, exerts a horizontal force of 4.80 x 10^4 N on the rails.
Although both stars probably formed from the same clump of gas, more massive one must have had its birth slowed so that it became a key -sequence star millions of years later than its less massive companion.
A 2.0 kg ball swings in a vertical circle on the end of an 80cm long string. Calculate the speed, magnitude and direction of acceleration
What will the force be between these charges. What should the banking angle of the curves be so that the force of the pavement on the tires of the car is in the normal direction.
The bullet becomes embedded in the block. If the bullet-block system compresses the spring by a highest of 90cm, what was the speed of the bullet at impact with the block.
A child slides across a floor in a pair of rubber-soled shoes. Thefriction force acting on each foot is 20.0 N. The footprint area ofeach shoe sole is 14 cm2, and the thickness of eachsole is 5 mm. Find the horizontal distance by which the upper a..
A person of mass 72-kg stands at the center of a rotating merry-go-round platform of radius 2.80 m and moment of inertia 930 kgcdot m^2. The platform rotates without friction with angular velocity 2rad/s. The person walks radially to the edge of t..
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