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A helicopter, starting at rest, accelerates straight upfrom the roof of a hospital. The lifting forces does work inraising the helicopter. An 810-kg helicopter rises from rest to aspeed of 7.0 m/s in a time of 3.5s. During this time it climbs to aheight of 8.2m. What is the average power generated by the lifting force?
Points A and B have electric potentials of 257 V and 129 V, respectively. When an electron released from rest at point A arrives at point C its kinetic energy is KE1, What is the electric potential at point C
A nonconducting disk of radius a lies in the z = 0 plane with its center at the origin. The disk is uniformly charged and has a total charge Q. Find Ez on the z axis at the following positions.
a wave pulse traveling to the right along a thin cord reaches a discontinuity where the rope becomes thicker and
A ball of mass 15.49 kg rests on a table of height 0.72 m. The tabletop is a rectangular glass plate of mass 12.13 kg, what is the force that the tabletop exerts on each leg
a diffraction pattern forms when light passes through a single slit. the wavelength of the light is 665 nm. determine
Calculate the torque on the center of mass of the rod alone with respect to the pivot point.(in N*m)? Calculate the unknown mass.(in kg).
A baseball thrown at an angle of 55.0?^\circ above the horizontal strikes a building 16.0m, Find the direction of the velocity of the baseball just before it strikes the building
An electrical cable consists of 184 strands of fine wire, each having 3.47 µ? resistance. What is the resistance of the cable
A garden hose having with an internal diameter of 2.0 cm is connected to a (stationary) lawnsprinkler that consists merely of an container with 23 holes, each 0.20cm in diameter. at what speed does it leavethe sprinkler holes
A 4 kg mass is connected to a spring (k = 730 N/m) platform which undergoes simple harmonic motion in the vertical direction. The amplitude of the oscillation is 5 cm. At t=0 the box is 5 cm above the equilibrium position.
A system of 1506 particles, each ofwhich is either an electron or a proton, has a net charge of-4.704 10-17 C. What is the mass of this system
Bats emit sounds of frequencies around 35.0 kHz and use echolocation to find their prey.What frequency is heard by the insect
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