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In the cable television show Ice Road Truckers, people often have to drive large trucks over frozen lakes. To prevent trucks from crashing through the ice, the ice needs to be at least 5.57 feet thick. Currently the ice is 4.76 feet thick, which is below the safe level. Today the temperature is well above freezing, but they are expecting a cold spell that could freeze the ice to safe levels. As the owner of a trucking company, you want your trucks to use the ice road as soon as possible. If the average temperature during the cold spell is 16.23°F and the water temperature is 32.0°F, how many hours will it take for the frozen lake to be safely passable? The latent heat of fusion of water is 3.33 × 105 J/kg and the thermal conductivity of ice is 2.180 W/m·K. The density of water near freezing is 1000.0 kg/m3 and the density of ice is 917.00 kg/m3.
A 2.0-N force acts horizontally on a 10-N block that is initially at rest on a horizontal surface. What is the magnitude of the frictional force that acts on the block
The 600-N ball shown is suspended on a string AB and rests againsta frictionless vertical wall. The string makes an angle of 30? with the wall. The ball presses against the wall with a force of magnitude:
The Junction Field Effect Transistor (JFET) also widely used in electronics. We will examine the DC characteristics of JFETs and will generate the JFET's curves
The blackbody radiation emitted from a furnace peaks at a wavelength of 6.2 x 10-6 m (0.0000062 m). What is the temperature inside the furnace
Provide rationale.
If he struck a ball with the a speed and launch angle that would result in a maximum 120m horizontal range on Earth, how far would it go?
In short-track speed skating, the track has straight sections and semicircles 16 m in diameter. What is the horizontal force on the skater
a large flat horizontal sheet of charge has a charge per unit area of 9.00 mcm2. find the electric field just above the
When a battery is connected to a 100 ohm resistor, the current is 4.00Amps. When the same battery is connected to a 450 ohm resistor, the current is 1.09 Amps. Find the emf supplied by the battery
A projectile is launched with aninitial speed of 60 m/s at an angle of 60 degrees. It lands on ahillside 4 seconds later. What is the straight line distance to where it lands
Atlas and hercules, two carnival sideshow strong men, each lift200kg barbells 2.00m off the ground. Calculate which man is more powerful
A wood cube 0.30m on each side has a density of 700kg/m^3 andfloats levelly in water. what is the distance from the top of the wood to the water surface
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