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A rescue helicopter lifts a 80.7-kg person straight up by means of a cable. The person has an upward acceleration of 0.828 m/s2 and is lifted from rest through a distance of 7.19 m.
(a) What is the tension in the cable? How much work is done by
(b) the tension in the cable and
(c) the person's weight?
(d) Use the work-energy theorem and find the final speed of the person.
Two charges are separated by some distance and the magnitude of the electric force between them is 224.6 Newtons. If the distance between the same two charges is tripled, what is the magnitude of the electric force on them now in Newtons?
Illustrate what is the speed of the three coupled cars after the collision? How much kinetic energy is lost in the collision?
A point charge with charge q1 = 2.80?C is held stationary at the origin, How much work W is done by the electrostatic force on the moving point charge
Two small nonconducting spheres have a total charge of 93.1 ?C. When placed 1.01 m apart, the force each exerts on the other is 11.5 N and is attractive. What is the charge on each?
Two balls, of masses = 49 and = 67 , are suspended as shown in the figure. The lighter ball is pulled away to a 66 angle with the vertical and released. suppose that positive axis is directed to the right. What is the velocity of the lighter ball ..
A candle is placed 16.0 cm in front of a convex mirror. When the convex mirror is replaced with a plane mirror, the image moves 7.5 cm farther away from the mirror. Find out the focal length of the convex mirror.
A pitcher throws a curveball that reaches the catcher in 0.55s. The ball curves because it is spinning at an average angular velocity of 280rev/min (assumed constant) on its way to catcher's mitt.
A 1.00-kg glider attached to a spring with a force constant 9.0 N/m oscillates on a frictionless, horizontal air track. Find the period of the glider's motion
The two stars in a certain binary star system move in circular orbits. The first star, Alpha, has an orbital speed of 36.0km/s. The second star, Beta, What is the mass of the star Beta and alpha
Monochromatic light falling on two slits 1.5×10?2mm apart produces the fifth-order fringe at an 8.9?angle.
Sources A and B emit long-range radio waves of wavelength 440 m, What is the magnitude of the phase difference at the detector
You have a string with a mass of 0.0131 kg. You stretch the string with a force of 9.31 N, giving it a length of 1.89 m, What is the wavelength of the standing wave you create in the string
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