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1. Consider heat loss through the two walls of a house on a winter night. The walls are identical, except that one of them has a tightly fit glass window. Through which wall will the house lose more heat? Explain.
2. Which is a better heat conductor, diamond or silver?
When Skylab reentered the Earth's atmosphere on July 11, 1979,it broke into a myraid of pieces. What was the kinetic energy of the film vault when it landed
A 30 ohm resistor has a voltage difference of 3 volts across its leads. What is the power being dissapated in the resistor
a 43.3 kg boy and a 60.0 kg girl are on the surface of a frozen lake 10.5 m apart. using a rope the boy exerts a
A 0.04 kilograms aluminum bullet traveling at 468 meter per second strikes an armor plate and comes to a stop. find the bullet temperature change in degrees Celsius
A sled starts up an incline of 350 with the horizontal. The sled starts from the bottom with an initial velocity of 5 m/s. (a) How far u p the incline does it go? A second sled starts to slide from the top when the first sled starts to slide down...
A jet boat pumps high-velocity water horizontally out the rear to provide forward thrust. A 1500-lb jet boat pumps 25.0 gal/s of water while traveling at 30.00 mph. The water exits the rear of the boat with a velocity of 70 mph.
4. A 555-g squirrel with a surface area of 865 cm^2 falls from a 4.4-m tree to the ground. Estimate its terminal velocity. (Use the drag coefficient for a horizontal skydiver. Assume that the cross-sectional area of the squirrel can be approximated a..
A 300g ball on a 70-cm-long string is swung in a vertical circle about a point 200 cm above the floor. What was the tension in the string an instant before it broke
A 1000 kg car is on a level floor where the coefficient of friction is 0.8. What force must the truck exert to move the car
Car headlights use concave mirrors. There's a concave mirror in the back of the headlight socket, and the actual light bulb is placed somewhere along the principal axis. :
Two spheres are launched horizontally from a 1.0 meter high table. Determine the distances that each travels from the edge of the table
Assuming that the ball's initial velocity was 45° above the horizontal and neglecting air resistance, what does the initialspeed of the ball need to be to produce such a home run if the ballis hit at a point 1.0 m(3.3 ft) above ground level? Assum..
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