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A freezer has a temperature -29 oC. The air in the kitchen has a temperature of 27 oC. Since the heat insulation is not perfect, some heat flows into the freezer at a rate of 60 W. Find the power of the motor that is needed to maintain the temperature in the freezer.
An object is 23.0cm from the center of a silvered spherical glass Christmas tree ornament 6.50cm in diameter. What is the magnification of its image
A crate of mass 45.0 kg is being transported on the flatbed of a pickup truck. The coefficient of static friction between the crate, What is the acceleration of the crate relative to the ground
What is the voltage of an alternator that produces a current of 0.039 A if it contains a series RCL circuit with a resistance of 300 ohm, an inductive reactance of 650 ohm and a capacitive reactance of 420 ohm?
the current flowing in a solenoid that is 23.9 cm long and has a radius of 2.20 cm and 530 turns decreases from 3.31 a
A Galilean design telescope is to be made with an objective of focal length 450 mm with an angular magnification of 18. What should the focal length of the eyepiece be
a photocell that detects the amount of light transmitted through the finger at each wavelength. Identify the frequency of each of these light sources. If 66% of the energy of the red source is absorbed in the blood, by what factor does the amplitu..
a grindstone used to sharpen tools is rotating at an angular speed fo 8 rads when an axe is pressed against it. because
A ball is thrown from the ground into the air. At a height of 9.1 m, the velocity is observed to be v = 7.1i + 6.8j, What will be the total horizontal distance traveled by the ball
A 15,000 kg loader traveling east at 20 km/h turns south and travels at 25 km/h. Calculate the change in the loaders
Assume that 36% of the body of a person floating in the Dead Sea will be above the water line, Find the density of the water in the Dead Sea
Light of wavelength 605 nm falls on a double slit, and the first bright fringe of the interference pattern is seen at an angle of 12.0° from the central maximum. Find the separation between the slits. µm
A sound wave, traveling at 353m/s, is emitted by the foghorn of a tugboat. How far away is the reflecting object
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