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Q. A 1.80x10^2 kg piano is being lifted at a steady speed from ground level straight up to an apartment 18.00 m above the ground. The crane that is doing the lifting produces a steady power of 4x10^2 W. How much time does it take to lift piano?
Q. A basketball (m = 0.65kg) is dropped from rest. Just before striking floor, the magnitude of the basketball's momentum is 2.90 kg•m/s. At what height was the basketball dropped?
What is the frequency of the small axial oscillations that electron will undergo if it is released along the z-axis near the origin.
Two positive point charges, each 17? C, lie along the x-axis at x = –0.12m and x = +0.12m.
A highway curve with a radius of 550 m is banked properly for a car travelling 130 km/h. If a 1660- kg Porshe 928S rounds the curve at 250 km/h, how much sideways force should the tires exert against the road if the car does not skid.
A signal starts at x point. As it travels to y point it loses eight db. At point y the signal is boosted by ten db. As the signal travels to point z it loses 7 db.
A child in a boat throws a 3.50 kg package out horizontally with a speed of 15m/s. Calculate the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child is 25kg and that of the boat is 70kg. Ignore water re..
A stone with a mass of 0.700 is attached to one end of a string 0.8 long. The string will break if its tension exceeds 65.0 . The stone is whirled in a horizontal circle on a frictionless tabletop; the other end of the string remains fixed.
An 845-N sled is pulled a distance of 173 m. The task requires 1.20 x 10^4 J of work and is done by pulling on a rope with the force of 142 N. At what angle is the rope held.
The proper length of one spaceship is 2.8 times that of another. The two spaceships are travelling in the same direction and, while both are passing overhead, an Earth observer measures the two spaceships to be the same length.
What is the difference in blood pressure ({rm mm-Hg}) between the top of the head and bottom of the feet of a 1.80-{rm m}-tall person standing vertically.
A small block with a mass of 0.170 kg is attached to a cord passing through the hole in a frictionless, horizontal surface .The block is initially revolving at a distance of 0.50 m from the hole with a speed of 0.80 m/s. The cord is then pulled from ..
What centripetal force will the ride exert. How far should the stone fall so that the pulley has 6.50 J of kinetic energy.
A worker drops a wrench from the top of a tower 88.00 m tall. With what velocity does the wrench strike the ground? (Suppose the positive direction is upward.)
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