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A 25 kg swings on a playground swing. If the swing hangs down 3 m from the top bar, and the child swings out 20 degrees, what is the height above the ground of the child at this angle and what is the change in potential energy of the child?
In April 2010, the worst oil spill until that time occurred when an explosion and fire on the Deepwater Horizon left 11 workers dead and began releasing oil into the Gulf of Mexico.
The air temperature is 80.00(F) during a thunderstorm, and thunder was timed 4.63 s after lightning was seen. How many feet away was the lightning strike
A 1400kg wrecking ball hangs from a 20m -long cable. By how much has the gravitational potential energy of the ball changed
A long jumper leaves the ground at 45 above the horizontal and lands 8.2 away. What is her "takeoff" speed
The velocity of a plane relative to still air is 135 mr/hr. The pilot wants to fly straught north over the ground. What is the direction of the wind relative to the ground
at point A, 3.00 m from a small source of sond that is emitting uniformly in all directions, the sound level is 53.0 dB. what is the intensity of the sound at point A
A 61.0 kg skier encounters a dip in the snow's surface that has a circular cross section with a radius of curvature of 12.0 m .If the skier's speed at point A is 7.50 m/s (before entering dip), what is the normal force exerted by the snow on the skie..
A satellite is circling the earth at 7.26 x 10^6 m with speed 7400 m/s. What is the speed of the second satellite
A spherically spreading EM wave has an average intensity of 570 mW/m2 at a point 9.5 m away from the source. What is the rms value of the electric field
A common measure for length in the publishing business is a point, defined as 1/72 inch. Illustrate what is an area of 0.50 gry squared in points squared? Round answer to the nearest hundreth.
you have a 100.00 cm track inclined at 10.000 degrees. You roll a steel ball down the track until it drops off the track and falls 1.0000 m to the floor
A flat copper sheet has a hole with area 0.250m2at room temperature (25?C). what's the hole's new area
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