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A person drops an object from a bridge spanning a rushing river, falling a distance h before hitting the water. Neglecting air resistance, what would be the object's speed at the moment of impact?
A box of mass 86.0 kg is connected to a second box with a mass of 30.0 kg. find the magnitude of the tension in the string between the two boxes
a bowling ball rolls across a horizontal roof with a speed of 8.57m/s If the roof is 12.5m/s above ground how far from the base of building will the ball land
The nonconservative wind and lift forces take the balloon up, doing +9.70 104 J of work on the balloon in the process. Illustrate at what height above the surface of the earth does the balloon have a speed of 8.90 m/s?
The range of human hearing is roughly from twenty hertz to twenty kilohertz. what are the lengths of the longest and shortest pipes
After a completely inelastic collision, two objects of the same mass and same initial speed are found to move away together at 1/2 their initial speed
A string under a tension of 49.0 N is used to whirl a rock in a horizontal circle of radius 2.40 m at a speed of 20.8 m/s on a frictionless surface, What is the breaking strength, in newtons, of the string
A space ship is approaching a space station of 1.2 x 10^5 m/s. compute the frequency of the beacon observed on the spaceship
You drive on Interstate 10 from San Antonio to Houston, half the time at 51 km/h and the other half at 98 km/h. What is your average speed from Houston back to San Antonio
The top of the hill is horizontal and 70 m higher than its base. What minimum speed must the block have at the base of the hill in order for it to pass over the pit at the far side of the hill
For a string stretched between two supports, two successive standing-wave frequencies are 505Hz and 630Hz . There are other standing-wave frequencies lower than 505Hz and higher than 630Hz.
Compare the kinetic energy of car travelling. Compare the kinetic energy of an 900 kg car travelling at 30 m/s, and a 1,800 kg car at the same speed.
A helicopter flies over the arctic ice pack at a constant altitude, towing an airborne 117-kg laser sensor which measures the thickness of the ice, find the tension in the cable towing the sensor
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