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Question: On a windy day a leaf is blown from 5m high central branch tree. As soon as it leaves the branch it is blown at 10ms-1 towards the East until it lands in a river flowing south. The leaf then floats down the river at 3ms-1 FOR 20 seconds until it gets caught on a rock. How far and in what direction from the base of the tree is the rock?
Some gliders are launched from the ground by means of a winch, which rapidly reels in a towing cable attached to the glider. Find what average power must the winch supply
A solid wood door 1.00 m wide and 2.00 m high is hinged alongone side and has a total mass 40.0 kg. Find the final angular speed of the door
The tungsten filament of a light bulb has an operating temperature of about 2 100 K. what is the power output of the light bulb
A block of wood has a mass of 3.87 kg and a density of 584 kg/m3. It is to be loaded with lead so that it will float in water with 0.84 of its volume immersed. What mass of lead is needed if the lead is on top of the wood
a steel wire has a diameter of 0.57mm and is 1.5m long. what tension is required to produce an extension of 1.5mm in
For a coal gasification project being planned, 26,000 tons of coal per day is used to produce 250,000,000 cubic feet per day of natural gas. If the coal is rated at 8700 Btu/lb and the gas at 950 Btu/cubic ft, what will be the efficiency of this plan..
A mass is trapped on the x-axis. Its potential energy is given by U=-2x^3 -3x^2 +12x. Where x is i meters and U is in joules. A) Determine an expression for the force that acts on the mass as a function of position.
You are given 10 identical springs. Describe how you would develop a scale of force (i.e., a means of producing repeatable forces of a variety of sizes) using these springs
An 8.4kg crate is pulled 4.7m up a 30? incline by a rope angled 16? above the incline. What is the increase in thermal energy of the crate and incline
A person walks first at a constant speed of 5.10 m/s along a straight line from point to point and then back along the line from to at a constant speed of 2.95 m/s. (a) What is her average speed over the entire trip? (b) What is her average veloci..
The acceleration due to gravity is 9.8 m/s^2 at Las Vegas, Nevada. What is the mass of the patatoes on the moon
A horizontal power line carries a current of 4900 A from south to north. Earth's magnetic field (74.7 µT) is directed toward the north and is inclined downward at 57.0° to the horizontal. Discover the magnitude of the magnetic force on 97.0 m of the ..
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