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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 720-kg helicopter rises from rest to a speed of 8.5 m/s in a time of 4.0 s. Through this time it climbs to a height of 9.5 m. What is the average power generated with the lifting force?
In a photoelectric-effect experiment, the wavelength of light shining on an aluminum cathode is decreased from 249nm to 207nm. What is the change in the stopping potential
a parallel plate capacitor has plates each of area 100 cm2 and with separation 0.25 mm. if this capacitor is charged
Estimate the phase difference between the sounds received by your ears when you are facing 90° away from the direction of the source
A proton moving at 4.30 106 m/s through a magnetic field of 1.75 T experiences a magnetic force of magnitude 8.04 10-13 N
The position vector,r, in meters, of a particle moving in the x-y plane, is giving by the following equation: r=i(2t^2-8t-12)+j(2t^3-18t^2+48t+25), find the direction of the velocity vector at the instant
a proton is fired into a uniform electric field opposite to the direction of the field. the protons speed upon entering
A rotating wheel requires 3.03-s to rotate through 37.0 revolutions. Its angular speed at the end of the 3.03-s interval is 99.0 rad/s
What is formula for the acceleration a of the cart in terms of the tension T, and its mass M? make use of the two equations you found above to eliminate T to give the acceleration of the cart in terms of M, m and g. Compute the numerical value for..
Suppose the force on an object is (5i-8j) N over a displacement of (5i+2j) meters. How much work is done by that force
A 72 kg man in a 5-kg chair tilts back so that all weight is balanced on two legs of the chair. Assume that each leg makes contact with the floor over a circular area with the radius of 1.0 cm, and find out the pressure exerted on the floor by eac..
1 you are conducting an osmosis experiment with a semi-permeable dialysis membrane of fixed pore size. if the solution
A runner moving at a constant speed of 11.7 m/s rounds a curve of radius 4.10 m. calculate the acceleration of the runner. (State the magnitude of this acceleration.)
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