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A heat engine takes in 126 kJ of heat from a reservoir at 820 K and exhausts 88 kJ to a reservoir at 292 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 child throws a stone horizontally from the top of a 15 m cliff with a speed of 10 m/s. If the stone weighs 2 N, find its kinetic energy and speed
A point charge with a charge q1 = 2.60?C is held stationary at the origin. How much work is done by the electric force on q2
Three successive resonance frequencies of an air column are 75, 125, and 175 Hz, What is the fundamental (lowest) frequency
A block of metal has an actual weight of 45 N and an apparent weight of 25 N in water. What is the buoyant force from the water
In a pool game, the cue ball, which has an initial speed of 8 m/s, make an elastic collision with the eight ball, which is initially at rest. Find the direction of motion of the cue ball after the collision
In 1986 a gargantuan iceberg broke away from the Ross Ice Shelf in Antarctica. It was approximately a rectangle 160 km long, What is the mass of this iceberg, given that the density of ice is 917 kg/m3
Two resistors, of R1 = 2.93 ? and R2 = 6.69 ?, are connected in series to a battery with an EMF of 24.0 V, Find the current I1 through the first resistor
A whale swims due east for a distance of 3.8 km, turns around and goes due west for 7.9 km, What is the total distance traveled by the whale
Consider a balloon being filled up with oxygen. You have approximately 30 moles of oxygen gas in this balloon with volume 1.3 m^3. compute the temperature of the molecules
A 500 kg spacecraft bound for a 5,000 km circular orbit around Jupiter is constructed and fueled in a 350 km circular orbit at Earth. what is the mass of fuel needed
A rectangle with a length L, and width L/2 has a surface charge density of 3.1mC/m^2. Determine the integral that would give you the electric field at a height h above the middle of the long edge.
A 100 N force has a horizontal component of 60 N and a vertical component of 80 N. What is the cart's final velocity
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