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A 120 V potential difference is applied to a space heater whoseresistance is 12 Ω when hot. (a) At what rateis electrical energy transferred to thermal energy?(b) What is the cost in cents for 6.0 h at US5.0¢/kW·h?
Multiple-Concept Example 10 provides one model for solving this type of problem. Two wheels have the same mass and radius of 4.2 kg and 0.39 m, respectively. Find the net external torque that acts on each wheel
You are flying to New York. You've been reading the in-flight magazine, which has an article about the physics of flying. What is the diameter of the airplane's path around the airport
Compressed air can be pumped underground into huge caverns as a form of energy storage. The volume of a cavern is 4.9 Ã- 105 m3, how many homes could this internal energy serve
A telescope can be used as a camera if the film is placed at the image position of the objective lens (or mirror); what is the angular separation of the two stars
Driving in your car with a constant speed of 12 {rm m}/{rm s}, you encounter a bump in the road that has a circular cross-section. If the radius of curvature of the bump is 35 {rm m}, find out the apparent weight of a 69 person in your car as you ..
Over a year's time, a person receives a biologically equivalent dose of 21 mrem (millirems) from cosmic rays, What is the person's absorbed dose in rads
A lab team rides a ski lift to the top of the mountain, due to some congestion their ears fail to pop, that is the pressure inside the ear does not equalize with the outside atmosphere. Calculate the force on the eardrum
Suppose a block with mass 2.80 kg is resting on a ramp. If the coefficient of static friction between the block and the ramp is 0.440, Find the maximum static friction force that acts on the block
A new electric power plant has an efficiency of 42%. how many are essentially lost as waste heat (in barrels of oil) to the environment
how fast the air flow over the upper surface of the wing. What is the coefficient of kinetic friction between the box and the floor.
A satellite has a mass of 6480 kg and is in a circular orbit 6.12 x 104 m above the surface of a planet. The period of the orbit is 2.00 hours. What is the true weight of the satellite when it is at rest on the planet's surface
A compound microscope has an objective lens of focal length 10.0 mm with an eyepiece of focal length 15.2 mm , and it produces its final image at infinity. How far from the objective lens is the first image formed
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