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A rescue helicopter lifts a 70-kg person straight up by means of a cable. The person has an upward acceleration of 0.70 m/s2 and is lifted from rest through a distance of 12 m.
(a) What is the tension in the cable?
(b) How much work is done by the tension in the cable?
(c) How much work is done by the person's weight?
(d) Use the work-energy theorem and find the final speed of the person.
A converging lens, which has a focal length equal to 8.2 cm, is separated by 32.5 cm from a second lens. Find the position of the final image using both a ray diagram and the thin-lens equation
A 13.6 kg object on a horizontal frictionless surface is attached to a spring with k = 519 N/m. find the initial potential energy of the block-spring system
Two small plastic spheres each have a mass of 1.9g and a charge of -52.0 nC. They are placed 3.0cm apart (center to center). A) What is the magnitude of the electric force on each sphere
Suppose a cylinder is resting on a horizontal platform on plane x-y with its axis parallel to the y axis, What is the motion (acceleration:linear as well as rotational) of the cylinder
A 1128 kg car and a 2210 kg pickup truck approach a curve on the expressway that has a radius of 272 m. A) At what angle should the highway engineer bank this curve so that vehicles traveling at 72.9 can safely round it regardless of the condition..
Tension is maintained in a string. The observed wave speed is 25 m/s when the suspended mass is 3.0 kg. (a) What is the mass per unit length of the string? (b) What is the wave speed when the suspended mass is 1.7 kg?
a large point charge of q 50 microc creates an electric field and an electric potential all around it. a styrofoam
A block of mass 4 kg is compressing a spring with K=2500 N/m a distance of 0.3 m. How much work does the spring do on the block
A person weighs 691 N in air but only 499 N when standing in water up to the hips. Find the volume of each of the person's legs
two circuits are constructed using identical ideal batteries emf e and identical lightbulbs resistance r. if each
In an advanced laboratory class a student performs the photoelectric experiment. Ultraviolet light is shone on a particular metal and the stopping potential is measured at the same time. What is Planck's constant based on this measurement
A man in a boat is looking straight down at a fish in the water (n = 1.333) directly beneath him. The fish is looking straight up at the man. how far above its eyes does the man appear to be
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