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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 released into the plants, thereby giving them a measure of protection against the falling temperature. Suppose a grower sprays 6.95 kg of water at 0°C onto a fruit tree.
(a) How much heat is released by the water when it freezes?
(b) How much would the temperature of a 115-kg tree rise if it absorbed the heat released in part (a)? Assume 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
When a rifle is fired, the person firing the rifle absorbs the recoil. Consider an Olympic biathlete firing a competition rifle. What is the magnitude of the force absorbed by the athlete
A machine is driven by a series of gears. The first gear has 12 teeth and rotates 25.0 times per minute. How many teeth does it have
a rigid structure consisting of a circular hoop of radius R and mass m, and a square made of four thin bars, each of length R and mass m. calculate the structure's rotational inertia about the axis of rotation
The density of ice is 917 kg/m3. What fraction of the volume of a piece of ice will be above the water when it is floating in fresh water, Fraction of the volume above the water
Humid air breaks down in a sufficiently strong electric field, What is the magnitude of the electrostatic force for an electron and for an ion with a single electron missing
Unpolarized light of intensity I0 is incident on three polarizing filters. What light intensity emerges from the third filter
The charge and the mass of an alpha particle are = 3.20×10-19 and = 6.68×10-27 , respectively. What is the final velocity of the alpha particle
A computer disk drive is turned on starting from rest and has a constant angular acceleration. How long did it take to make the first complete revolution
Suppose a large conducting slab is polarized (one side is positive and the other is negative) What is the electric field force (E) inside the slab
A 40.0g ball of clay traveling east at 3.00m/s collides, What is the speed of the resulting ball of clay
A hydrogen atom is in its first excited state (n = 2). Using the Bohr theory of the atom, calculate (a) the radius of the orbit, (b) the linear momentum of the electron.
On a distant planet, golf is just as popular as it is on earth. On the distant planet, what is the maximum height of the ball
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