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Problem:
Growing in the shade. Ability to grow in shade may help pines found in the dry forests of Arizona resist drought. How well do these pines grow in shade? Plant pine seedlings in a greenhouse in either full light, light reduced to 25% of normal by shade cloth, or light reduced to 5% of normal. At the end of the study, dry the young trees and weigh them.
A light bulb is connected to a 240-V wall socket. The current in the bulb depends on the time t according to the relation I = (2.828 A) sin[(345.4 Hz)t]. What is the average power delivered to the light bulb
a sample of an unknown material appears to weigh 280 n in air and 175 n when immersed in alcohol of specific gravity
Fission of a uranium nucleus (containing 92 protons) produces a barium nucleus (56 protons) and a krypton nucleus (36 protons). estimate the size of the uranium nucleus
We wish to coat a piece of glass (n=1.5) with a thin film (n=1.42) so that a maximum amount of light will be transmitted, what is the minimum thickness of the film in millimeters
A 77.5-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is accelerating upward with an acceleration of 2.46 m/s2
A boy kicks a football from ground level with an initial velocity of 20 m/s at an angle of 60 degrees above the horizontal. What is the horizontal distance to the point where the football hits the ground
The flash unit in a camera uses a 9 V battery to charge a capacitor.The capacitor is then discharged through a flash lamp. obtain the capacitance of the capacitor
A ball is released at the bottom of a container of liquid. The ball rises upward, pops out of the liquid and reaches a height of 20 cm, Calculate the velocity of the ball when it leaves the liquid
During an earthquake, a house plant of mass 10.0 in a tall building oscillates with a horizontal amplitude of 12.0 at 0.30. What is the magnitude of the maximum velocity of the plant
A coil of wire is connected to an ideal7.00V battery att= 0. Att=10.0ms, the current in the coil is204mA. Find the resistance and inductance of the coil
A copper ball of mass 150 g is removed from Bunsen burner flame and dropped into 500g of water at -20 %u030AC. what was the temperature of the copper when it left the flame
You push a 325-N trunk up a 20.0 degree inclined plane at aconstant velocity by exerting a 211-N force parallel to the plane's surface. estimate the magnitude and direction of the friction force
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