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A heat engine takes in 111 kJ of heat from a reservoir at 811 K and exhausts 83 kJ to a reservoir at 290 K.
(a) What is the efficiency of the engine?
(b) What is the efficiency of an ideal engine operating between the same two reservoirs?
A spaceship of proper length298m takes0.79µs to pass an Earth observer. find the speed of this spaceship as measured by the Earth observer
You throw a ball vertically upward so that it leaves the ground with velocity 2.49 m/s. (a) What is its velocity when it reaches its maximum altitude. (b) What is its acceleration at this point.
An object with a height of 42 cm is placed 2.3 m in front of a convex mirror with a focal length of -0.40 m. Find the location and magnification of the image
A horizontal block-spring system with the block on a frictionless surface has total mechanical energy E = 55.1 J, What is the kinetic energy of the system at the equilibrium point
The side-view mirror of an automobile has a radius of curvature of 20cm. The mirror produces a virtual image one-third the size of the object. How far is the object from mirror.
A 3600 kg truck is moving at a constant speed of 50.0 m/s. The coefficient of friction between the tires and the road is .550. find What is the net force acting on the car
A huge space cruiser passes earth at speed c/2. It launches a small fighter ship away from earth (thank goodness) at speed c/2 relative to the cruiser. What is the speed of the fighter ship relative to earth
A steel ball bearing 7.00mm in diameter is dropped into a cylinder of glycerin. What is the terminal velocity of the ball bearing
What is the magnitude of an average acceleration of the ball
A 34.0kg crate is initially moving with a velocity that has magnitude 3.70m/s in a direction 37.0 %u2218west of north. How much work must be done on the crate
q1. a ranger in a national park is driving at 52 kmh when a deer jumps onto the road 86 m ahead of the vehicle. after a
A sledge loaded with bricks has a total mass of 18.0 kg and is pulled at constant speed by a rope inclined at 19.6° above the horizontal. How much work is done by the rope on the sledge
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