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A Carnot air conditioner maintains the temperature in a house at 297 K on a day when the temperature outside is 307 K. What is the coefficient of performance of the air conditioner?
If the tension in a guitar string is increased by 20%, by what percentage does the wave speed increase? Harmonic waves are produced by a source that isoscillating in SHM. Which one of the following statements is correct concerning harmonic waves?
If the distance between the first and tenth maxima of a double slit pattern is 4.2mm and the slits are separated by 0.15mm with the screen 90cm from the slits,what is the wavelength of the used?
A constant horizontal force Fa pushes a 2 kg FedEx package across a frictionless floor on which an xy coordinate system has been drawn. It gives package's x and y velocity components versus time t. What is the magnitude of Fa.
23 kg of a liquid metal with a latent heat of fusion of 53.12 kJ/kg freezes while at its melting temperature of 354 °C. Calculate the change in entropy of the metal
A transformer has 3,840 turns in the secondary. The inputvoltage is 110V, the output current is 6.5A. the input current is0.5A. Calculate the output voltage
In a double-slit experiment, what is the linear distance on the screen between adjacent maxima if the wavelength is 538 nm
A spherical water drop 3.7 ?m in diameter is suspended in calm air due to a downward-directed atmospheric electric field of magnitude E = 12100 N/C. find the magnitude of the gravitational force on the drop
A circular loop of wire is in the plane of the paper. The south pole of a bar magnet is being moved from a position in front of the paper in a direction away from the center of the loop. Which is the direction of the induced current in the loop?
a box with a weight of 50 n rests on a horizontal surface. a person pulls horizontally on it with a force of 10 n and
A uniform meter stick is in static rotational equilibrium when a mass of 220 g is suspended from the 5.0 cm mark, What is the mass of the meter stick
A 745 N window washer is standing on a scaffold supported by a vertical rope at each end. What is the tension in the rope on the left
An ideal spring with a stiffness of 379N/m is attached to a wall, and its other end is attached to a block that has a mass of 16-kg. The spring/block system is then stretched away from the spring's relaxed position until 59J of mechanical potentia..
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