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If a heat engine absorbs 940.0 J of heat from the hot reservoir and exhausts 330.0 J of heat to the cold reservoir, what was the work done by the engine? What is the efficiency of this engine?
As a function of time t, force component Fx that acts on a 3.00 kg ice block that can move only along the x axis. At t=0, the block is moving in positive direction of the axis, with a speed of 3.0 m/s. what are its (a) speed and (b) direction of trav..
An object of mass 263.25285 g executes SHM with an amplitude of 14.906379 cm and a period 29.11989 s. Find the force acting on the object
If 20 grams of hot water at 80°C is poured into a cavity in a very large block of ice at 0°C, what will be the final temperature of the water in the cavity? How much ice should melt in order to cool the hot water down to this temerature.
A convex lens with f1= 20.3cm is mounted 39.5cm to the left of a concave lens. When an object is placed 29.4cm to the left of the convex lens, What is the focal length f2 of the concave lens
Two objects (m1 = 4.95 kg and m2 = 2.60 kg) are connected by a light string passing over a light, frictionless pulley suspended over a table. Determine the speed of each object when the two pass each other
A blow-dryer and a vacuum cleaner each operate with a voltage of 120 V. The current rating of the blow-dryer is 12 A, find the power consumed by the vacuum cleaner
Mountaineers often use a rope to lower themselves down the face of a cliff (this is called rappelling). They do this with their body nearly horizontal, What tension does his rope need to support
In 2004 baseball player Adam Dunn hit the longest home run ever hit in Great American Ballpark in Cincinnati. What was the maximum height achieved by the baseball
After performing an experiment concerning charging a capacitor Sally noticed that the potential difference across the capacitor reached 2/3 of its final value after 18 seconds. find the time constant for the resistor-capacitor combination
Between 1911 and 1990, the top of the leaning bell tower at Pisa, Italy, moved toward the south at an average rate of 1.2 mm/y. The tower is 55 m tall. In radians per second, what is the average angular speed of the tower's top about its base?
A helium balloon ride lifts up passengers in a basket. Assume the density of air is 1.28 kg/m3 and the density of helium in the balloon is 0.18 kg/m3. What is the magnitude of the buoyant force on each person
The sidereal period of the Earth is 23 hours, 56 minutes, and 4.0 seconds. Determine the angular velocity of the Earth's rotation on its axis
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