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A freezer compartment consists of a cubical cavity that is 2 m on a side. Assume the bottom to be perfectly insulated. What is the minimum thickness of Styrofoam insulation (k = 0.030 W/m. K) that must be applied to the top and side walls to ensure a heat load of less than 500 W, when the inner and outer surfaces are - 10 and 35°C?
You are driving south on a highway at 28 (approximately 63 ) in a snowstorm. Estimate the speed of the snowflakes relative to the car
Old naval ships fired 13 kg cannon balls from a 210 kg cannon. It was very important to stop the recoil of the cannon, since otherwise the heavy cannon would go careening across the deck of the ship.
The electric potential energy stored in the capacitor of adefibrillator is 65 J, and the capacitanceis 137 µF. What is the potential difference that exists across the capacitor plates?
A solid ball and a hollow ball, each with a mass of 2 kg and radius of 0.1 m, start from rest and roll down a ramp of length 3 m at an incline of 44°. What is the speed of the ice cube at the bottom of the incline
q1. a 1035 kg car carrying four 78 kg people travels over a rough washboard dirt road with corrugations 5.0 m apart
what is the amplitude of the electric field vector of the satellite broadcast as measured at the surface of the earth? Use Eo=8.85*10^-12C/(V*m) for the permittivity of space
A circus performer stretches a tightrope between two towers. He strikes one end of the rope and sends a wave along it toward the other tower. He notes that it takes the wave 0.675 s to reach the opposite tower, 20.0 m away. If a 1 meter length of ..
A playground merry-go-round of radius R = 1.20 m has a moment of inertia I = 260 kg · m2 and is rotating at 8.0 rev/min about a frictionless vertical axle, What is the new angular speed of the merry-go-round
A river 101.8 m wide flows toward the south at 31.0 m/min. A girl on the west bank wishes to reach the east bank in the least possible time. What is her velocity relative to land
A certain lightbulb has a tungsten filament with a resistance of 19.1 ? when at 20.0°C and 139 ? when hot, Find the temperature of the hot filament
A 2.65-g copper coin at 21.5°C drops 60.0 m to the ground. (Assume the specific heat of copper is 387 J/kg · °C.) determine the coin's final temperature
One component of a metal sculpture consists of a solid cube with an edge of length 0.211 m. Find the cube\'s mass
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