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A heat engine takes in 150 kJ of energy from a source at 740 K and expels 50 kJ to a reservoir at 300 K. Calculate the ideal efficiency and the actual efficiency of the engine.
The cabin is located 3ydsabove the lake. Please find the change in kinetic and potential energy of the stream in J/min.
What was the speed of the bullet before impact if the two objects move together after impact?
What would be the weight of the spherical mass at that location? Give your answer in the form "a.bc x 10^(y)" N.
A piano string has a fundamental frequency of 100 Hz, is 1.0 M long and has a mass of 100 g. What is the tension on the piano string?
A grinding wheel is in the form of a uniform solid disk of radius 6.99 cm and mass 1.97 kg. It starts from rest and accelerates uniformly under the action of the constant torque of 0.609 N ·
A potter's wheel-a thick stone disk of radius 0.500 m and mass 125 kg-is freely rotating at 50.0 rev/min. The potter can stop the wheel in 6.00 s by pressing a wet rag against the rim and exerting a
Two converging lenses, each of focal length 15.2cm, are placed 40.9 cm apart, and an object is placed 30.0 cm in front of the first lens. Where is the final image formed? What is the magnification o
A man standing 1.56 m in front of a shaving mirror produces an inverted image 17.6 cm in front of it. How close to the mirror should he stand if he wants to form an upright image of his chin that i
If the spheres are initially at rest and just touching, how much energy is required to separate them to 1.08 m apart? Assume that the only force acting on each mass is the gravitational force due to
The two blocks undergo a perfectly inelastic collision. What should the velocity of the red block be in order to have the two blocks move to the left with a speed of 0.56 after the collision?
A 1041 kg van, stopped at a traffic light, is hit directly in the rear by a 744 kg car traveling with a velocity of +2.00 m/s. Assume that the transmission of the van is in neutral, the brakes are n
If a proton is moving in a magnetic field with a speed of 4 × 106 m/s and is executing uniform circular motion with a radius of 10 cm, what is the magnetic field?
An electron with a velocity of v= (3x+ 4y+ 2z) × 106 m/s enters a region where there is both a magnetic field and an electric field. The magnetic field is B = (1x- 2y+ 4z)T. If the electron e
What is the acceleratin of the box? What was the total work done on the box? What is the final velocity? ( use work-energy theorem)
A mass of 10 kg was hung vertically from a spring. The system obtain equilibrium with a stretched length of 30 cm. a) What was the spring constant of this spring?
The coffcient of kinetic friction between the block and the incline is 0.1. The block is initially at rest. What is the kinetic energy of the block after it has been displaced 2 m along the incline?
Calculate the current induced in the ring if the ring has a resistance of 0.050 Ω during the quench. You may assume that the ring is oriented so that the field goes perpendicular to the plane of
Calculate the force on that wire if the magnetic field of the Earth is 6.0*10-5 T. You may assume that the magnetic field is perpendicular to the wire.
An electron is accelerated through an electric potential of 267 V, then enters a 37 Gauss magnetic field in a direction at a right angle to the velocity. Find the radius in cm of the subsequent circ
Find the magnetic field strength (in Gauss) for a current of 3.7 A in the Helmholtz coils with 147 turn, assuming a coil radius of 15 cm.Express the answer with one decimal place.
A soldering iron uses an electric current in a wire to heat the tip. A transformer with 100 turns on the secondary coil provides 49W at an rms voltage of 26V. What is the resistance of the wire in t
At a certain instant before the carts collide, the first cart's velocity is +5.2 m/s, and the second cart's velocity is -2.2 m/s. (a) What is the total momentum of the system of the two carts at thi
The mass of the roller is 2.5 kg; and its radius is 4.0 cm. Ignoring the mass of the handle of the roller, what is the magnitude of the tangential acceleration of the roller?
Water is then isothermally compressed at 1.5 bar to state 4 and then via adiabatic compression back to state 1. (a) Determine the heat transfer (kJ) and work (kJ) for each process.