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Consider a flat-plate solar collector placed on the roof of a house. The temperatures at the inner and outer surfaces of the glass cover are measured to be 28°C and 25°C, respectively. The glass cover has a surface area of 2.5 m2, a thickness of 0.6 cm, and a thermal conductivity of 0.7 W/m · °C. Heat is lost from the outer surface of the cover by convection and radiation with a convection heat transfer coefficient of 10 W/m2· °C and an ambient temperature of 15°C. Determine the fraction of heat lost from the glass cover by radiation.
The volume control on a surround-sound amplifier is adjusted so the sound intensity level at the listening position increases from 21 to 59 dB. What is the ratio of the final sound intensity to the original sound intensity?
a student adds two perpendicular displacement vectors of magnitude 12.0 cm and 8.0 cm. which of the following is the
If an ocean wave strikes the land every 12 seconds and the horizontal distance between adjacent crests and troughs is 4 m, what is the average speed of the wave
A spring is mounted from the ceiling. As a mass is attached, the spring stretches 1.04 m. What will be the frequency of the resulting oscillation
Suppose that a molecular ion with charge -10e is embedded within the 5.0-nm-thick cell membrane of a cell with membrane potential -70 mV. What is the electric force on the molecule?
A flowerpot falls off a windowsill and falls past the window below. You may ignore air resistance. It takes time 0.420s to pass this window, which is of height 1.92 m. How far is the top of the window below the windowsill from which the flowerpot ..
(a) Calculate the relativistic quantity γ = for 1.00 TeV protons produced at Fermilab. Correct: Your answer is correct. (b) If such a proton created a π+ having the same speed, how long would its life be in the laboratory? Correct: Your answer is cor..
The G string on a violin has a fundamental frequency of 196 Hz. It is 33.0 cm long and has a mass of 0.500 g. what is the effective length of her string
If a charge of ?2.20 ?C is placed at this point, what are the magnitude and direction of the force on it
How much heat must be removed from 0.40 kg of water at 0 degrees C to make ice cubes at 0 degrees C?
A 2000 kg car is rolling at 2.0 m/s. You would like to stop the car by firing a 18 kg blob of sticky clay at it. How fast should you fire the clay
A hockey stick is swung with the average angular acceleration of 1.5 rad/s2. What is the angular velocity of the stick as it strikes the ball at the end of 0.8 second swing.
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