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The construction of a flat rectangular roof (5.15 m × 7.44 m) allows it to withstand a maximum net outward force of of 2.33 × 104 N. The density of the air is 1.29 kg/m3. At what wind speed will this roof blow outward?
A parallel-plate capacitor is charged to an electric potential of 337 V by moving 3.88E+16 electrons from one plate to the other
A Carnot engine extracts 550 J of heat from a high-temperature reservoir during each cycle, compute the efficiency of the engine
At what temperature is the speed of sound in helium (ideal gas, = 1.67, atomic mass = 4.003 u) the same as its speed in oxygen gas at 4.78 oC
The nucleus of 8Be, which consists of 4 protons and 4 neutrons, is very unstable and spontaneously breaks into two alpha particles, What is the force between the two alpha particles when they are 5.20 10-15 m apart
your optometrist recommends that you purchase reading glasses with a refractive powerof 3 diopters. determine the location of your near point or far point
A popular pastime is to see who can push an object closest to the edge of a table without its going off. what was the object's speed as you released it
The spring constant for the tendon is the same for both groups, 32 {rm {N}/{mm}} . What is the difference in maximum stored energy between sprinters and nonathletes.
A wrecking ball (weight = 5680 N) is supported by a boom, which may be assumed to be uniform and has a weight of 2520 N. compute the tension in the support cable
A 10000 kg boxcar traveling at 20 m/s strikes a second boxcar at rest. The two stick together and move off with a speed of 11 m/s. What is the mass of second car.
A ball is thrown horizontally from the top of a 60.0-m building and lands 100.0 m from the base of the building. Ignore air resistance. What must have been the initial horizontal component of the velocity
Explain how much force must you exert to keep the pole motionless and horizontal?
A 3.00-kg crate slides down a ramp. The ramp is 1.00 m in length and inclined at an angle of 30.0o. The crate starts from rest at the top, What is the speed of the crate at the bottom of this new ramp
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