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A particle of mass m is attached to the end of a light string of length l. The other end of the string is passed through a small hole and is slowly pulled through it. Gravity is negligible. The particle is originally spinning the round the hole with angular velocity w. Find the angular velocity when the string length has been reduced to 1/2 l. Find also the tension in the string when its length is r, and verify that the increase in kinetic energy is equal to the work done by the force pulling the string through the hole.
a 40g horizontal metal bar 12cm long is free to slide up and down between two tall vertical metal rods that are 12cm
A tiger leaps horizontally from a 5.4 -high rock with a speed of 4.0. How far from the base of the rock will she land
Calculate the adiabatic flame temperature attained when methane at 298k, is combusted (a) with oxygen in the molar ratio air/CH4 = 9.524. Assume that CO2 and H2O are the products of the combustion. The adiabatic flame temperature is that temperature ..
A bullet of mass 10 g strikes a ballistic pendulum of mass 2.0 kg. The center of mass of the pendulum rises a vertical distance of 10 cm. assuming that the bullet remains embedded in the pendulum, compute the bullet's initial speed.
The sound intensity level0.7 m from a jack hammer is 130 dB relative to the threshold ofhearing. How much acoustic power is produced by one jack hammer
Earth's gravitational field is 7.83N/kg at the altitude of the space shuttle. What is the size of the force of attraction between a student with a mass of 45.0kg and Earth?
The lens-to-retina distance of a woman is 1.98 cm, and the relaxed power of her eye is 52.0 D. What is her far point
Two free point charges +q and +4q are a distance l apart. Find the location, magnitude, and sign of the third charge
A nozzle is now attached to the end of the hose. If the nozzle diameter is one-third the diameter of the hose, what is the speed of the water leaving the nozzle
Two automobile batteries are connected in parallel to power a wheelchair. Find the current provided to the motor
a helicopter lifts a 72kg astronaut 15m vertically from the ocean from rest by means of a cable. the acceleration of
Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. What is the acceleration of the yellow car
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