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To help prevent frost damage, fruit growers sometimes protecttheir crop by spraying it with water when overnight temperaturesare expected to go below the freezing mark. When the water turns toice during the night, heat is released into the plants, therebygiving them a measure of protection against the fallingtemperature. Suppose a grower sprays 8.88 kg of water at 0°Conto a fruit tree.
(a) How much heat is released by the water when it freezes?
(b) How much wouldthe temperature of a 148-kg tree rise if it absorbed the heatreleased in part (a)? Assume that the specific heat capacity of thetree is 2.5 x 103 J/(kg C°) and that no phase changeoccurs within the tree itself.
Consider a long wire that makes a right angle (90°) bend. If the wire carries a current I, what is the magnetic field at point A
A man exerts a 328 N force to move a box across a 3.55-m patch of ice. How much work does he do on the box.
Calculate the force on a 1 meter long length of wire carrying a 5 amp current in a magnetic field of .75 teslas that act perpendicular to the wire. determine the change in the acting force on the wire
The "reaction time" of the average automobile driver is about 0.7 s. Compute the total distance covered in coming to a stop after a signal is observed from an initial velocity of 15.6 mi/h
A luggage carousel at an airport has the form of a section of a large cone, steadily rotating about its vertical axis, Calculate the force of static friction exerted by the carousel on the bag
The pressure exerted by a phonograph needle on a record is surprisingly large. what pressure is exerted on the record in N/m2
The eight ball m = 0.5 kg is initially moving with a velocity v = 4.2i m/s. What is the magnitude of the velocity of the eight ball after the collision in m/s
What minimum force must be applied to the crate perpendicular to the incline to prevent crate from sliding down the incline.
A ball with an intial velocity of 8.00 m/s rolls up a hill without slipping. Treating the ball as a spherical shell, calculate the vertical height it reaches
Compute the rms speed of a nitrogen molecule at 12.0°C and At what temperature will the rms speed be half that value
A 64kg human sprinter can accelerate from rest to 10 m/s in 3.0s . During the same time interval, a 28kg greyhound can go from rest to 20 m/s. What is the average power output of the human
A plane is flying in the horizontal plane. At time t1 = 0 s with the components of its velocity are vx= 100 m/s and vy = 120 m/s. At time t2= 20 s the components are vx = 80 m/s and vy = 142 m/s.
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