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A helicopter, starting from rest, accelerates straight up from the roof of a hospital. The lifting force does work in raising the helicopter. An 920-kg helicopter rises from rest to a speed of 7.0 m/s in a time of 3.5 s. During this time it climbs to a height of 9.1 m. What is the average power generated by the lifting force?
During a 75-ms interval, a change in the current in a primary coil occurs. What is the change in the primary current
A thin spherical shell of silver has an inner radius of 7.80 x 10-2 m, Find the change in the interior volume of the shell
Seismographs measure the arrival times of earthquakes with a precision of 0.100 s.7 To get the distance between to the epicenter of the quake, they compare the arrival times of S- and P-waves, which travel at different speeds.
Bronco Brown is mowing his lawn. He applies a force F along the handle of the lawnmower as shown. Bronco moves the mower at constant velocity.
Calculate the absolute pressure at the bottom of a fresh-water lake at a depth of 30.8 m. Assume the density of the water is 1.00 103 kg/m3 and the air above is at a pressure of 101.3 kPa
A 2000 kg car is slowed down uniformly from 21.0 m/s to 6.00 m/s in 5.60 s.
A sample of 10.0 mCi decays 1.2% in a single day. What is the activity after 30 days?
Observer S detects two flashes of light. A big flash occurs at x1 = 1242 m and, 6.06 ?s later, a small flash occurs at x2 = 802 m. what is the time interval between the flashes
A screen 1.8 m wide is located 3.6 m from a pair of slits illuminated by 620 nm laser light, Find the highest-order bright fringe that will appear on the screen of the slit spacing is .20 mm
Two positive charges, each of magnitude 3. 10-6 C, are located a distance of 4 cm from each other. What is the magnitude of the force exerted on each charge
A golf ball strikes a hard, smooth floor at an angle of 32.5 ° and rebounds at the same angle, What is the magnitude of the impulse applied to the golf ball by the floor
A car is traveling with a constant velocity when the driver suddenly applies the brakes, giving the car a deceleration of 3.50 m/s2, what was the magnitude of the car's original velocity
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