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Through a thunderstorm, winds with a speed of 48.7 m/s blow across a flat roof with an area of 687 m2. (a) Discover the magnitude of the force exerted on the roof as a result of this wind. (b) Is the force exerted on the roof in the upward or downward direction?
A 55.1-kg ice skater is moving at 3.99 m/s when she grabs the loose end of a rope, the opposite end of which is tied to a pole. Determine the force exerted by the horizontal rope on her arms
sound waves with frequency 2700 hz and speed 343 ms diffract through the rectangular opening of a speaker cabinet and
A copper rod has a length of 1.3 m and a cross-sectional area of4.7 x 10-4 m2. What is the mass of ice per second that melts
Photorefractive keratectomy (PRK) is a laser-based surgery process that corrects near- and farsightedness by removing part of the lens of the eye to change its curvature and hence focal length. What is the energy of a single photon
A railroad hopper car has a mass of 50000 kg when empty and contains 50000 kg of coal. How fast does the car travel after all the coal is dumped
A transport plane flies horizontally with a fix velocity of160 m/s, at a height of 2000 m. Find how far ahead of the marker does the tank hit the ground
The frequency of a tuning fork is 358 Hz. Find the length of the shortest organ pipe which will give 6 beats/s with the fork. The velocity of sound in air is 339.1 m/s.
An unmarked police car travelling a constant 95 km/h is passed by a speeder travelling 145km/h. Precisely 1 s after the speeder passes, the police officer steps on the accelerator.
Calculate the number of bright fringes per centimeter. At what two locations on x-axis (xpositive, xnegative) is the potential zero.
consider a completely isolated thick conducting infinite slab. one face-off the slab has a uniform surface charge
The two wires of length 2 m are 3 mm apart and carry a current of 9 A dc. Calculate the force between these wires
Two identical metal spheres and are connected by a plastic rod. Both are at first neutral. 6.0×10^12 electrons are added to sphere , then the connecting rod is removed.
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