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A hot-air balloon is ascending at the rate of 14 m/s and is 57 m above the ground when a package is dropped over the side. (a) How long does the package take to reach the ground? (b) With what speed does it hit the ground?
A neutron star has a mass of 2.0*10^30 kg (about the mass of our sun) and a radius of 5.2*10^3 m (about the height of a good-sized mountain). assume an object falls from rest near the surface of such a sta
Al moves off with a speed of 8.98 m/sec in one direction and Jo moves off with a speed of 9.70 m/sec in the other. You can assume friction is negligible. What is Al's mass.
How much greater is an angular momentum of the Earth orbiting about the sun than the moon orbiting about the Earth? (Set up a ratio of angular momenta using data on inside back cover. The period of the moon is about 27.3 days.)
Examine whether it is reasonable to ignore the effects of gravity for each particle. Evaluate the paths travelled by electron and proton and explain the differences.
An airplane is flying with a velocity of 86.0 at an angle of 23.0 above the horizontal. When the plane is a distance 114 straight above a dog that is standing on level ground, a suitcase drops out of the luggage compartment.
A jogger accelerates from rest to 5.87 m/s in 3.53 s. A car accelerates from 21.3 to 34.7 m/s also in 3.53 s. (a) Find the magnitude of the acceleration of the jogger. (b) Find out the magnitude of the acceleration of the car. (c) How much further..
A space station, in the form of a wheel 133 m in diameter, rotates to provide an "artificial gravity" of 2.20 m/s2 for persons who walk around on the inner wall of the outer rim. Find the rate of the wheel's rotation in revolutions per minute that wi..
Graph the power of the laser when it's on. b) Compute the energy in the pulse. c) Compute the number of photons in the pulse.
A 10,000 kg railroad car is rolling at 2 m/s when a 400 kg load of gravel is suddenly dumped in. What is the railroad cars speed just after the gravel is dumped in.
At one instant a bicyclist is 50 m due east of a park's flagpole, going due south with a speed of 9 m/s. Then, 24 s later, the cyclist is 45 m due north of the flagpole, going due east with a speed of 20 m/s. For the cyclist in this 24 s interval,..
A charge of -3.55 nC and a charge of -5.65 nC are unconnected by a distance of 60.0 cm. Find the position at which a third charge of +7.20 nC can be located so that the net electrostatic force on it is zero.
A 40 g rifle bullet travelling 260 m/s buries itself in a 4.0 kg pendulum hanging on a 3.0 m long string, which makes the pendulum swing upward in an arc. Find out the vertical and horizontal components of pendulum's displacement.
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