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A large oak tree produces 2.2 metric tons of wood over a 50 year growth lifespan. This wood has a heating value of 20Mj/kg the tree has a caopy of 10 meters in diameter and this canopy collects solar enegy over a 6 month growing season each year at an average rate of 177W/m^2 ; assume no solary energy is collected druing the other 6 months when the tree is dormant. Estimate the tree's efficiency for converting solar energy to wood heating value.
Problem on a hare and a tortoise battle
A 171 kg block of ice at 0.0°C is placed in a large lake. The temperature of the lake is just slightly higher than 0.0°C, and the ice melts very slowly, What is the entropy change of the universe
A block with mass m = 5.00kg slides down a surface inclined 36.9 ? to the horizontal (the figure (Figure 1) ). The coefficient of kinetic friction is 0.27. What is the acceleration of the block down the plane
A quarter-pound hamburger with all the fixings has a mass 220g . The food energy of the hamburger is 2.4MJ. What is the energy equivalent of the mass of the hamburger
A 20 Kg loudspeaker is suspended 2.0 m below the ceilling by two cables that are each 30' from vertical . What is the tension in the cables
Light of two different wavelengths is used in a double-slit experiment. What is the wavelength of the other light
The middle C string on a piano is under a tension of 882 N. The period and wavelength of a wave on this string are 3.82 10-3 s, Find the linear density of the string
Staring from rest, a hoop rolls without slipping down a long ramp. What is its translational speed when it's 5.0 m below its initial height, determine the hoop's translational speed
The position of an object connected to a spring varies with time according to the expression x = (4.4 cm) sin(6.9?t). (a) Find the period of this motion.
An electron in a vaccuum is first accelerated by a voltage of 10,000 volts, find the force of the electron due to the magnetic field
A converging lens has 31.3 cm focal length, and is placed 20.9 cm behind a diverging lens. Parallel light strikes the diverging lens, What is the focal length of the diverging lens in cm
An 800kHz radio signal is detected at a point 6.6 kmdistant from a transmitter tower. The electric field amplitude of the signal at that point is 780mV/m. What is the magnetic field amplitude of the signal at that point
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