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An air conditioner operating between 93°F and 67°F is rated at 4000 Btu/h cooling capacity. Its coefficient of performance is 27% of that of a Carnot refrigerator operating between the same two temperatures. What horsepower is required of the air conditioner motor?
An electron in a vaccuum is first accelerated by a voltage of 10,000 volts, find the force of the electron due to the magnetic field
For distant objects, the angular size in degrees can be approximated as 57° (w/d), What is the angular size of the headlights on a car 7 km away if the headlights are 1.6 m apart
A 6.00?kg ball is dropped from a height of 13.0m above one end of a uniform bar that pivots at its center. The bar has mass 7.50kg and is 6.80m in length. How high will the other ball go after the collision
A sledge loaded with bricks has a total mass of 17.0 kg and is pulled at constant speed by a rope inclined at 19.9° above the horizontal. What is the mechanical energy lost due to friction
Your job is to lift 30kg crates avertical distance of 0.90m from the ground onto the bed of a truck. How many crates for an average power output of 100W
an 10-kg ball moving at 22 ms collides elastically and head-on with a second 6-kg ball moving in the opposite direction
Two blocks of weights 70.0 and 100.0 N are connected by as massless string and slide down an inclined plane making an angle of 42.0 deg. find the magnitude of the heavier block's acceleration
The angular position of a pendulum is represented by the equation given below where ? is in radians and ? = 4.12 rad/s. Determine the period and length of the pendulum
A 1.0-cm-tall object is 7.5 cm in front of a diverging lens that has a 10 cm focal length. Determine the image height by making measurements on your diagram
you shine red laser light with wavelength 670 nm through two narrow slits where the spacing between the slits is 0.005
q1. monochromatic light from a distant source is incident on a slit 0.750 rm mm wide. on a screen 2.00 rm m away the
a train moving with constant velocity travels 170 m north in 12 s and an undetermined distance to the west. the speed
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