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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 9.0 m/s in a time of 3.5 s. During this time it climbs to a height of 9.7 m. What is the average power generated by the lifting force?
A uniform disk of radius 0.459 m and unknown mass is constrained to rotate about a perpendicular axis through its center. Find the mass of the disk
Gas flows from a reservoir at 2000 psi pressure into a well at 1 atm pressure, what is the actual volumetric flow in the well
A 1663.22 lbs. go-cart and driver rounds a curve. If the centripetal force on the go-cart and driver is 1000 lbs. What is the radius of the curve
Constable Bob inspected skid marks near a traffic accident to determine the acceleration of initial velocity of lawn mower involved in the accident. Bob measured the lawn mower skid marks to be 32 m long. Witnesses said the lawn mower was skiddin..
A transformer has 100 turns in the primary with a voltage of 100V, and 200 turns in the secondary with a voltage os 200V. what will be the current in the secondary
In the figure below, two parallel-plate capacitors A and B are connected in parallel across a 600 V battery. Each plate has area 70.0 cm2; the plate separations are 3.30mm, Find the magnitude of the electric field within the dielectric of capacitor..
What is the velocity of the beam of electrons that go undeflected when passing during perpendicular electric and magnetic fields of magnitude 4700 V/m and 3.6×10-3 T, correspondingly.
Find out the longest wavelength electrons that can produce a first-order maximum.
A fishing line has attached to it a hollow plastic float 2.65 cm in diameter and having a mass of 1.50 g. Find the mass of a lead weight
A particle with a charge of q = -5.40 nC is moving in a uniform magnetic field of vec{B}=( -1.24 T ) hat{z}. The magnetic force on the particle is measured to be vec{F}= ( -7.60×10-7 N )hat{y}. find v_x, the x component of the speed of the particl..
define why a dielectric increases the maximum operating voltage of a capacitator even though the physical size of the capacitator doesn't change.
You are doing exercises on a Nautilus machine in a gym to strengthen your deltoid (shoulder) muscles. If you have set the tension in the cable of the machine to 33.0 N on each arm, what is the tension in each deltoid muscle if you hold your outstre..
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