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Q. To help prevent frost damage, fruit growers sometimes protect their crop by spraying it with water when overnight temperatures are expected to go below the freezing mark. When the water turns to ice during the night, heat is free into the plants, thereby giving them a measure of protection against the falling temperature. Assume a grower sprays 7.64 kg of water at 0°C onto a fruit tree.
(i) How much heat is released by the water when it freezes?
(ii) How much temperature of 175kg tree rise would if it absorbed the heat release in part (i)? Presume that the specific heat capacity of the tree is 2.5 x 103 J/(kg C°) and that no phase change occurs within the tree itself.
A car of mass 2100 kg collides with a truck of mass 4500 kg, and just after the collision the car and truck slide along, stuck together. The car's velocity just before the collision was m/s, and truck's velocity just before the collision was m..
A point charge 4.20 mu C is held fixed at the origin. A second point charge 1.60 mu C with mass of 2.80×10-4 kg is placed on the x axis, 0.280 {rm m} from the origin. The second point charge is free from rest. What is its speed when its distance f..
A friend of yours is loudly singing a single note at 411 Hz while racing toward you at 25.5 m/s on a day when the speed of sound is 341 m/s.
A satellite with a mass of 750 kg is in orbit around the earth. It is initially located at the altitude (measured from the earth's surface) of 2.12 x 106 m. It is then moved into a new orbit, with an altitude of 4.25 x 10^6 m (again, measured from..
what is the minimum acceleration necessary for the plane to take flight.
A 29 g rifle bullet travelling 270 m/s buries itself in a 3.50 kg pendulum hanging on a 2.6 m long string, which makes pendulum swing upward in an arc. Find out the horizontal component of the pendulum's displacement.
A spring stiffness 900 N/m and relaxed length 1m stands vertically on a table. You hold a block of mass 1 kg barely touching the top of the spring. Assume you let the mass down onto the spring certain distance very slowly and view the mass is not mov..
what force is needed to pull a 150 pound sled along a horizontal surface? The coeficient of kinetic friction is 0.10 and the sled is pulled by a rope that makes the angle of 0 degree with the horizontal. There is no acceleration.
A person carries a long pole of mass 20 kg and length 3.4 m at the angle of 60 degrees. Find the magnitude of the torque on the pole due to gravity.
A small metal bead, labeled A, has a charge of 29 . It is touched to metal bead B, initially neutral, so that the two beads share the 29 charge, but not necessarily equally. When the two beads are after that placed 5.0 apart, the force between the..
The resolution of the eye is ultimately limited by pupil diameter. What is the smallest diameter spot an eye can produce on the retina if pupil diameter is 4.45? Assume light with a wavelength of = 600 .
A radio controlled car increases its kinetic energy from 4J to 12J over the distance of 2 m. What was the average net force on the car during this interval.
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