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a man sitting in a bosun's chair that dangles from a massless rope, which runs over a massless frictionless pulley and back down to the man's hands. The combined mass of the man and the chair is M=95.0 kg.
(a) With what force must the man pull on the rope for him to rise a constant speed ?
(b) What force is needed for an upward acceleration of 1.3 m/s2 ?
(c) Suppose, instead, that the rope on the right is held by a person on the ground. Repeat parts (a) and (b) for this new situation.
(d) In each of the four cases, what is the force exerted on the ceiling by the pulley system?
A migrating bird is initially flying south at 10 m/s. To avoid hitting a high-rise building, the bird veers and changes its velocity to 3 m/s east over a period of 2 s. What is the bird's average acceleration (magnitude and direction) during this ..
An electron with kinestic energy 1.8 keV circles in a plane perpendicular to a uniform magnetic field. The orbit radius is 27.0 cm, Find the period of the motion
What would be the radius of curvature of the cornea
If the circular surface of the upper end of the rod is maintained at 290 K, what is the approximate boil-off rate of liquid helium after the lower half has reached 4.20 K
what average power was developed. A curve of radius 70 m is banked for a design speed of 110 km/h. If the coefficient of static friction is 0.30 (wet pavement), at what range of speeds can a car safely make the curve.
what is the bee's speed at once afterward.
A 2.00 m tall basketball player wants to make a goal from 10.0 m from the basket. If he shoots the ball at a 45.0° angle, at what initial speed should he throw the basketball so that it goes through the hoop without striking the backboard.
A severe thunderstorm dumped 2.5 in of rain in 30 min on a town of area 33km2. What mass of water (in kg) fell on town? One cubic meter of water has a mass of 103kg.
The acceleration of gravity is 9.81 m/s^2. Assuming that air resistance is simply a constant 96 N force on the person during the fall, identify the person's velocity just before hitting the net. Answer in units of m/s.
A relatively small puncture is made at the base of a large, open-topped water reservoir that sits on the ground, determine the water level in the tank
A butterfly at eye level is 26 cm in front of a plane mirror. You are behind the butterfly, 48 cm from the mirror. What is the distance between your eye and the image of butterfly in the mirror.
A particle leaves the origin with an initial velocity=(3.76i)m/s and a constant acceleration =(-1.43i-2.69j) m/s^2. find velocity and position vector of particle
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