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You keep your coffee in a sealable thermal mug which has thermal conductivity k-0.036 W/m k. The mug is about 15 cm high and its average radius is about 3.0 cm and has wall thickness of 5.0 mm. The coffee can be considered to have the same properties of water. If the mug is filled with coffee and placed in room temperature (25 C), Starting from boiling temperature, how long (in minutes) will it take the coffee to cool down to:
A steam catapult launches a jet aircraft from the aircraft carrier John C. Stennis, giving it a speed of 210 mi/h in 3.00 s. (a) Find the average acceleration of the plane. m/s2 (b) Assuming the acceleration is constant, find the distance the plan..
A cylindrical piece of metal 8.50 cm tall with a radius of 1.95 cm has a specific gravity = 4.0, what is the mass of the cylinder in units of grams
A boat is cruising in a straight line at a constant speed of 2.5 m/s when it is shifted to neutral. what was the boats acceleration while coasting
An 88 kg spacewalking astronaut pushes off a 640kg satellite, exerting a 640N force for the 0.60 s it takes him to straighten his arms.
A 47.0 g golf ball is driven from the tee with an initial speed of 60.0 m/s and rises to a height of 25.2 m, Neglect air resistance and determine the kinetic energy of the ball at its highest point
A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1020 Hz. The bird-watcher, however, hears a frequency of 1060 Hz. What is the speed of the bird, expressed as a percentage of the speed of sound?
A device known as Atwood\'s machine consists of two masses hanging from the ends of a vertical rope that passes over a pulley. Assume the rope and pulley are massless and there is no friction in the pulley.
Suppose we are given a square coil that is 5.5 cm on a side containing 100 loops of very fine wire. The total resistance of this coil is 2.0 ? 10?3 ?. Find the magnitude of the peak value of the induced current flowing in this coil under these cond..
the snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57 N. Find out the acceleration of the sled and child.
A certain commercial mass spectrometer (Fig. 28-12) is used to separate uranium ions of mass 3.92 x 10-25 kg, calculate the thermal energy (in J) produced in the cup in 1.07 h
a car moving at 10.0 m/s encounters a bump that has a circular cross-section with radius of 30.0m, What is normal force exerted by the seat of the car
A 284-kg motorcycle is accelerating up along a ramp that is inclined 30.0º above the horizontal. Find the magnitude of the motorcycle's acceleration.
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