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A Styrofoam cooler has total wall area (including lid) of 0.80 m2 and wall thickness of 2.0 centimeter. It is filled with ice, water, and a cola, all at 0oC. Calculate the rate of heat flow into the cooler if the temperature is 30oC outside. k=0.027 W/mK. Obtain how much of the ice melts in three hours?
A cruise ship sails 150 km east, then 250 km northwest, and then 100 km at 30° east of south, Find the magnitude and the direction of the last leg of the journey
the earth has an angular speed of 7.272middot10-5 rads in its rotation.find the new angular speed if an asteroid m
An electric field of 7.85 10^5 V/m is desired between two parallel plates, each of area 42.0 cm2 and separated by 2.45 mm of air. What charge must be on each plate.
If the length of the Achilles tendon increases 0.600 cm when the force exerted on it by the muscle increases from 3087 N to 4955 N, what is the "spring constant" of the tendon
Light rays traveling through air enters a piece of plexiglass at an angle of 33°. The index of refraction of plexiglass is 1.43. The light than re-enters the air at what angle upon leaving the plexiglass.
The convex lens of a copy machine has a focal length of 25.0cm. A letter to be copied is placed 40.0cm from the lens. How far from the lens is the copy paper located? The machine was adjusted to give an enlarged copy of the letter. How much larger wi..
A solid disk of radius R and mass 2.66 kg is spinning atangular velocity 64.7 rpm about a vertical axis. What is the mass of the second disk
a microscope with an 9.0 mm focal-length objective has a tube length of 14.0 cm for the microscope to be in focus how
A 45.0-kg girl is standing on a 144-kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. What is her velocity relative to the surface of ice
A tungsten wire has a radius of 0.082 mm and is heated from 20.0 to 1399 oC. The temperature coefficient of resistivity is ? = 4.5 x 10-3 (Co)-1. How long is the wire
The head of a grass string trimmer has 100 g of cord wound in a light, cylindrical spool with inside diameter 3.00 cm and outside diameter 18.0 cm as shown in the figure below. The cord has a linear density of 10.0 g/m. A single strand of the cord..
A car is moving on a flat horizontal circular track of radius 120 m. The speed of the car is constant, 15m/s. The mass of the car is 1200 kg. Ignore air resistance. What force is keeping the car in the circle?
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