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The R factor for housing insulation gives the thermal resistance in units of ft2 °F h/BTU. A good wall for harsh climates, corresponding to about 10 in of fiberglass, has R = 40 ft2 °F h/BTU. (a) Determine the thermal resistance in SI units. m2 K/W (b) Find the heat flow per square meter through a wall that has insulation with an R factor of 40, with an outside temperature of ?33 °C and an inside temperature of 20 °C. W/m^2
A mica sheet 0.969 ?m thick is suspended in air. In reflected light, there are gaps in the visible spectrum at 460, 525, Calculate the index of refraction of the mica sheet
A capacitor is constructed with plates of area A and separation s. The area between the plates is ?lled with a weakly ionized gas — a very poor conductive medium with resistivity = 10^8 ohms * cm. The density of the gas is so low that it has no e?e..
Megan's mass is 28kg. She climbs the 4.8m ladder of a slide and reaches a velocity of 3.2m/s at the bottom of the slide. How much work was done by friction on Megan? Assume that air resistance is negligible.
The pilot of an aircraft wishes to fly due west in a 34.60 km/h wind blowing toward the south. The speed of the aircraft in absence of a wind is 145 km/h.
Your cell phone typically consumes about 440 mW of power when you text a friend. what is the current flowing through the cell-phone circuitry under these circumstances
Two different simple harmonic oscillators have the same natural frequency (f=2.60 Hz) when they are on the surface of the Earth. Calculate the new frequency of the vertical spring and mass
A positive charge Q1 = 3.00 µC is in the origin and a negative charge Q2 = -5.00 µC is at point x = 11m. where the electric potential equals zero
Determine the capacity of a roll crusher. The separation is 7 mm, speed of the rollers is 50 rpm, roller diameter is 23 cm, roller length is 0.4 m
A 1600 kg submarine rises straight up towards the surface. Seawater exerts both an upward buoyant force of 16430 N on the sub, with a downward resistive force of 1000 N. What is the submarine's acceleration.
A very hard rubber ball (m = 0.7 kg) is falling vertically at 9 m/s just before it bounces on the floor. find the average force exerted by the floor on the ball
Looking out the window of a train you observe the passengers on a second train moving in the opposite direction at a constant velocity. determines which of the two trains is actually moving
In a certain chemical process, a lab technician supplies 231J of heat to a system. What is the increase in the internal energy of the system
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