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On a winter day with a temperature of Tc, the temperature inside a room is Th, where Th > Tc. The heat conduction rate through a slab of thickness L, surface area A, thermal conductivity k is measured to be H. Assume you found a way to triple the slab thickness and reduce the thermal conductivity to one quarter, what is the new heat transfer rate H' in terms of H? Assume the temperatures inside and outside the room and the surface area remains the same.
if 60 of u.s. petroleum use goes for transportation and 1 of this goes for buses how much oil could be saved per year
If I have light of three different frequencies, 9.2x10^14 Hz; 6.7x10^14 Hz; 4.7x10^14 Hz that is shined on a metal surface with the observations for each frequency labled A,B, and C as follows:
A particle of mass 0.500 kg is attached to the 100-cm mark of a meterstick of mass 0.200 kg. Calculate the angular momentum of the system
the amount of charge that passes through the filament of a certain lightbulb in 2.00 s is 1.67c.a find the current in
whenever the velocity changes there is a non-zero acceleration. the change can be in only the magnitude of the velocity
a jet cruising at 26400 feet descends 96 miles away from a jet cruising at 31680 feet which is 120 miles from logan
How many protons hit the target. How much energy is delivered to the target each second if the protons each have a kinetic energy of 30 MeV and lose all of their energy in the target.
The volume control on a stereo amplifier is adjusted so the sound intensity level increases from 23 to 61 dB. What is the ratio of the final sound intensity to the original sound intensity?
A child's toy arrow has a suction cup on one end. When the arrow moving in positive x direction hits the wall, it sticks. The radius of the suction cup is 1.0 cm. Suppose that the mass of the arrow is about 10 g and it is concentrated in the suction ..
A person pulls a toboggan for a distance of 40m along the snow with a rope directed 25 degrees above the snow. The tension in the rope is 83N.
Find (a) magnitude and (b) direction of A - B. (Give the direction as a positive angle with respect to due east). Find out the (c) magnitude and (d) direction of B - A. (Give the direction as a positive angle with respect to due west).
Assume that a car can operates on either 100% gasoline or 100 % ethanol, with no discernable difference in performance. How far can the car travel along the same route on a full tank of ethanol
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