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A factory worker moves a 28.0kg crate a distance of 4.80m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and the floor is 0.300. A) What magnitude of force must the worker apply? B) How much work is done on the crate by the worker's push? C) How much work is done on the crate by friction? D) How much work is done by the normal force? E) How much work is done by gravity? F) What is the net work done on the crate?
A women drove to work at an average speed 40 miles per hours and returned along the same route at 30 miles per hour. What was the total number of miles in the round trip
A ball is thrown from the top of a building upward at an angle of 46 degrees to the horizontal and with an initial speed of 30m/s. the speed of the ball just before it strikes the ground
A 16 kg child slides down a 3.1 m-high playground slide. She starts from rest, and her speed at the bottom is 2.4 m/s. What is the change in the thermal energy of the slide
The tub of a washer goes into its spin cycle, starting from rest and gaining angular speed steadily for 7.00 s, Through how many revolutions does the tub turn while it is in motion
How many 95W light bulbs can you use in a 120V circuit without tripping a 17A circuit breaker? (The bulbs are connected in parallel, which means that the potential difference across each light bulb is V.)
A resistance thermometer using a platinum wire is used to measure the temperature of a liquid. The resistance of is 2.42ohms at 0 degrees, calculate the temperature of the liquid
How does the angular separation between fringes in single-slit diffraction experiment change when the distance of separation between the slit and screen is doubled
Telephone signals are often transmitted over long distances by microwaves. What is the frequency of microwave radiation with a wavelength of 3.3 cm
questiona person bending forward to lift a load with his back rather than with his knees can be injured by large forces
A 1.0cm * 1.0cm parallel-plate capacitor has a 2.0mm spacing. The electric field strength inside the capacitor is 1.3*10^5 V/m, What is the potential difference across the capacitor
An electron passes through a point 3.01 cm from a long straight wire as it moves at 35.3% of the speed of light perpendicularly toward the wire. Find the magnitude of the electron\'s acceleration at that point
How long after the car passes point A does the radio experience a minimum in the net signal? suppose that the wavelength has the value found in part.
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