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What pressure is required to force water into a pore with a diameter of 100 nm? Assume the contact angle of the water with the pore is 100 degress (the material is hydrophobic), the temperature is 25C, and the air pressure in the pore is the same as outside the pore.
A cyclist is coasting at a steady speed of 16m/s but enters a muddy stretch where the effective coefficient of friction is 0.55. What will be his speed upon emerging
Two loudspeakers are placed 3.00 m apart, as shown in the figure. They emit 450 Hz sounds, in phase. A microphone is placed d = 3.00 m distant from a point midway among the two speakers, where an intensity maximum is recorded.
A converging lens (f = 11.9 cm) is located 30.6 cm to the left of a diverging lens (f = -5.94 cm). calculate the overall magnification
A spring-rn ass system, m and k, is started with an initial displacement of unity and an initial veIocity of zero.
Greezy-X has a 150 N bird-feeder in his backyard. It is suspended by two ropes tied to a third as shown in the diagram. Calculate the tension in each of the three ropes
A 2.4mW laser produces a beam of light with a diameter of 2.6mm shines its light on a perfectly absorbing surface. What is the radiation pressure exerted with the beam?
A siren has a frequency of 875 Hz when it and an observer are both at rest. The observer then starts to move and finds that the frequency he hears is 1251 Hz. What is the speed of the observer
suppose that the electric potential outside a living cell is higher than that inside the cell by 0.087 v. how much work
Find the rms speed of the molecules of a sample of N2 (diatomic nitrogen) gas at a temperature of 38.9°C
An football is punted at 25.0 m/s at an angle of 30.0 degree above the horizon. What is the velocity vector of the ball when it is 5.00 m above the level ground
The initial rotational inertia of the student's body (not including the dumbbells) with arms extended is 6.0 kg.m2 and her final rotational inertia is 5.0 kg.m2 . Determine the student's final rotational speed.
Radioactive materials have sometimes been used directly as a power source. How much energy (J) could be generated from the decay of a mole of 238-Pu
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