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A tightrope walker wonders if her rope is safe. Her mass is 60 kg and the length of the rope is about 20 m. The rope will break if its tension exceeds 5400 kg. What is the smallest angle at which the rope can bend up from the horizontal on either side of her to avoid breaking?
A glass window 0.35 cm thick measures 81 cm by 36 cm. How much heat flows through this window per minute if the inside and outside temperatures differ by 17° C
A Styrofoam cooler has a surface area of 2,700 cm2 and a wall thickness of 3.0 cm. Styrofoam has a coefficient of thermal conductivity of 0.01 W/m C. how long will the ice last
It is 156 cm from your eyes to your toes. You're standing 212 cm in front of a tall mirror. How far is it from your eyes to the image of your toes
A solid, square pinewood raft measures 4.4 m on a side and is 2.80 m thick. What is the total mass of swimmers that the raft can carry and float with its top surface at waterlevel
What was the magnitude of the average force exerted on your car during braking? What was the direction of the average force exerted on your car during braking? What was the direction of the average force exerted on your car during braking
A microwave oven is powered by an electron tube called a magnetron, which generates electromagnetic waves of frequency 3.46 GHz. determine the speed of the microwaves
A boy stands at one end of a floating raft that is stationary relative to the shore. Explain does the raft move
The current density in a 2.8 μm thick 75 μm wide gold long film is 750,000 A/m2. The current flows along the length of the film. Compute what is the current in the film
A baking dish is removed from a hot oven and placed on a cooling rack. As the dish cools down to 37° C from 192° C, What was the net radiant power of the baking dish when it was first removed from the oven
monatomic molecules adsorbed on a surface are free to move on this surface and can be treated as a classical ideal two
A golf ball hits a wall and bounces back at 1/4 the original speed. What part of the original kinetic energy of the ball did it lose in the collision
An 1150-kg car pulls a 450-kg trailer. The car exerts a horizontal force of 3.8 x 103 N against the ground in order to accelerate. What force does the car exert on the trailer
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