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A Thermopane window of area 6.8 m2 is constructed of two layers of glass, each 5.4mm thick and separated by an air space of 2 mm. If the inside is at 12?C and the outside is at ?36?C, how much heat is lost through the window? The thermal conductivity of glass is 0.8 W/m · ? C and of air 0.0234 W/m · ? C. Answer in units of kW.
A suspension bridge is 62.0 m above the level base of a gorge. If you drop the stone, how long does it take for it to fall to the base of the gorge
charge q1=1.4x10-8C is placed at the origin. Charges q2=-1.8x10-8C and q3=2.1x10-8C are placed at points (0.18m , 0m) and (0m , 0.24m)
A golfer hits a ball from the origin with an initial speed of 30.0m/s at an angle of 50 degrees above the horizontal. what is the speed and direction of motion of the ball just before it lands
A 0.20-kg billiard ball travelling at a speed of 15.00 m/s strikes the side rail of a pool table at an angle of 60 degrees. If the side rail rebounds at the equal speed and angle what is the change in its momentum?
The magnetic field inside a 5cm diameter solenoid is 2.0T and decreasing at 4.0 T/s. What is the electric field strength inside the solenoid
A car accelerates from 10 m/s to 30 m/s at a rate of 3.0 m/s^2. How far does it travel while accelerating
A 6.50?Fcapacitor that is initially uncharged is connected in series with a 4500resistor and a 505 V emf source with negligible internal resistance. A long time after the circuit is completed (after many time constants), what are the values of the ..
An inventor claims to have devised a cyclic engine which exchanges heat with reservoirs at 300 K and 540 K, and which can produce 450 J of work per 1000 J of heat extracted from the hot reservoir. Is his claim feasible.
When an electric circuit is being assembled, a common practice is to twist together two wires carrying equal currents in opposite direction
A projectile is shot directly away from Earth's surface. Neglect the rotation of the Earth. What multiple of Earth's radius RE gives the radial distance (from the Earth's center) the projectile reaches if (a) its initial speed is 0.550 of the escape ..
A baggage cart full of luggage is coasting at a speed vA across the airport taxiway. When forty-one percent of the mass of the cart and luggage is thrown off the cart, Calculate the ratio vB/vA
A Projectile (Mass M) is launched at an angle (theta) with an initial speed u. Write expressions for angular momentum (L) and torque vectors (T) about the launch point. hence show that dL/dt = T. Assumptions: No Air Resistance and constant gravity
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