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A Carnot heat pump operates between an outdoor temperature of 262 K and an indoor temperature of 293 K. Find its coefficient of performance.
A square, perfectly reflecting surface is oriented in space to be perpendicular to the light rays from the Sun, What is the radiation force on the surface from the light rays
A suction cup works by virtue of a vacuum that is created within the cup. When the cup is pressed against a flat surface, most of the air is forced out, what is the pressure inside the suction cup
Multiple Concept Example 4 and Interactive LearningWare 6.2 review the concepts that are important in this problem. What is the final speed of the probe
In Denver, children bring their old jack-o-lanterns to the top of a tower and compete for accuracy in hitting a target on the ground. What is the launch speed needed to hit the bulls-eye
The equation describing a transverse wave on a string is y(x,t)=( 4.50mm )sin[( 168s?1 )t?( 42.8m?1 )x]. Find the speed of motion of this wave
A spring is hung from a ceiling,and an object attached to its lower end stretches the spring by adistance of 5.00 cm from its unstretched position when the systemis in equilibrium. determine the mass of the object
A metallic sphere has a charge of +4.4 nC. A negatively charged rod has a charge of -6.0 nC. When the rod touches the sphere, 7.2 109 electrons are transferred. What are the charges of the sphere and the rod now? sphere nC rod nC
Suppose that a 1.00 cm3 box in the shape of a cube is perfectly evacuated, except for a single particle of mass 1.15 10-3 g. Find the mass density inside the box
When playing fortissimo (very loudly), a trumpet emits sound energy at a rate of 0.750 W out of a bell (opening) of diameter 13.2 cm. What is the sound intensity level right in front of the trumpet
Jack and John are standing 6m apart from each other playing soccer. Jack kicks the ball to John and John kicks it back immediately. What is the speed of the ball when it's kicked back to Jack
The current in a series circuit is 14.9 A. When an additional 10.6-? resistor is inserted in series, the current drops to 9.47 A. What is the resistance in the original circuit
A 87 g arrow is fired from a bow whose string exerts an average force of 105 N on the arrow over a distance of 76 cm. Illustrate what is the speed of the arrow as it leaves the bow?
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