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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 760-kg helicopter rises from rest to a speed of 8.9 m/s in a time of 3.7 s. During this time it climbs to a height of 7.4 m. What is the average power generated by the lifting force?
P =
If the lithospheric plates move on average at 6 cm/yr, what would be a typical recycling time of terrestrial crust
The attractive electrostatic force between the point charges 7.14×10?6 and has a magnitude of 0.825, find the sign and magnitude of the charge Q
A cylindrical container with a cross-sectional area of 66.2 holds a fluid of density 816 kg/m3, and bottom of the container the pressure is 118 kPa. What is the depth of fluid.
A person is pushing a uniformly-loaded 21.65 kg wheelbarrow along a plank that makes an angle ? = 27.0° with the horizontal. What is the total force the person must apply
A motorist drives south at 28.0 m/s for 3.00 min, then turns west and travels at 25.0 m/s for 2.20 min, find the average velocity and degree south of west
Light of wavelength 571 nm incident on a pair of slits produces an interference pattern on a distant screen in which the separation between adjacent bright fringes at the center of the pattern is 0.571 cm. A second light source, when incident on t..
The person in the middle weighs 190 N, and the tensions in each rope are 200-N. What is the weight of the staging.
An air-filled capacitor consists of two parallel plates, each with an area of 7.60 cm2, separated by a distance of 1.60 mm. Calculate the charge on each plate
Consider a spherical asteroid with a mass of 6.00×10^15 kg and a radius of 9.70 km. What is the speed of a satellite orbiting 6.00 km above the surface
In 9.7 s a fisherman winds 2.8 m of fishing line onto a reel whose radius is 3.0 cm, Determine the angular speed of the reel
Using the elbow joint as the axis of rotation, determine the magnitude of the net torque acting about the elbow due to the forearm, hand, and ball
A car starts from rest at a stop sign. It accelerates at 4.0 m/s2 for 6 seconds, coasts for 3 s, How far apart are the stop signs
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