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Design an optimal winter coat to keep you warm. Use the principle of heat transfer (conduction, convection, and radiation). Give description of how they affect the coat. What color should the coat be and what would it be made from?
Defibrillators are used to revive a person when their heart has stopped beating. How do they work? What care must the person administering the treatment take
A concave mirror (R = 56.0 cm) is used to project a transparent slide onto a wall. The slide is located at a distance of 38.0 cm from the mirror, and a small flashlight shines light through the slide and onto the mirror. The setup is similar to that ..
An automobile with 0.250 m radius tires travels 90,000 km before wearing them out. How many revolutions do the tires make
A textbook of mass 1.98kg rests on a frictionless, horizontal surface. A cord attached to the book passes over a pulley whose diameter is 0.160m , find the tension in the part of the cord attached to the book
As we've seen, astronauts measure their mass by measuring the period of oscillation when sitting in a chair connected to a spring. What is the mass of an astronaut who oscillates with a period of 2.16 when sitting in the chair
The engine of an aircraft propeller delivers an amount of power 171hp to the propeller at a rotational velocity of 2360 rev/min the torque= 516 Nm, How much work does the engine do in one revolution
A conveyor belt at a quarry lifts 2,000 kg of sand per minute up a vertical distance of 12 meters. The sand is at first at rest, then moves at a speed of 0.20 m/s along conveyor belt. What is the instantaneous power generated by this machine .
The position of an object is given as a function of time as x(t) = (-3.00 m/s)t + (1.00 m/s2)t2. What is the average speed of the object between t = 0.00 s and t = 2.00 s
An object of mass m is dropped at t = 0 from the roof of a building of height h. While the object is falling, a wind blowing parallel to the face of the building exerts a constant force F on the object. (a) At what time t does the object strike th..
Two capacitors are identical, except that one is empty and the other is filled with a dielectric (κ = 4.50). The empty capacitor is connected to a 12.0-V battery, What must be the potential difference across the plates of the capacitor filled with ..
A 30.0 kg rock slides on a rough horizontal surface at 7.50 m/s and eventually stops due to friction. What average thermal power is produced as the rock stops
A flywheel for energy storage in a hybrid gasoline-electric car is a ring-shaped rotor of mass 49 kg, designed to rotate at 30000 rpm. What is the ring's diameter
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