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A woman can read the newspaper if it is held no closer than 57.2 cm from teh eye. What should the focal length of a lens be if she wants to read at a more comfortable distnace of 23.8 cm
Two 4.4 kg bodies, A and B, collide. The velocities before the collision are A = (12 + 46) m/s and B = (-32 + 22) m/s. After the collision, 'A = (-16 + 30) m/s. What is the change in the total kinetic energy
Sketch the electric field and equipotential lines associated with a 6 coulomb negative charge and a 3 coulomb positive charge. what is the force between the charges
The normal boiling point of ammonia is -33.33 C. The boiling point of ammonia under 23.74 psi is -23.33 C. Suppose the pressure on the liquid ammonia at -23.33 C is suddenly dropped from 23.74 psi to 14.71 psi (1 atmosphere).
A basketball of mass 3 kg and radius 0.20 m rolls without slipping down an incline of angle 30 degrees. Calculate the acceleration of the center of mass
A whistle of frequency 520 Hz moves in a circle of radius 80.0 cm at an angular speed of 12.0 rad/s. What are the lowest and highest frequencies heard by a listener a long distance away from the whistle and at rest with respect to the center of th..
Westerly winds coming off the Pacific Ocean rise over the Rocky Mountains, which rise to a height of approximately 15,000 ft (580 hPa). The air on the western side of the mountain range is at 800 hPa (T = 70F, r = 0.75), and will subside on the ea..
In getting ready to slam-dunk the ball, a basketball player starts from rest and sprints to a speed of 6.94 m/s in 1.48 s. determine the distance he runs
A woman with a mass of 47.0 kg is standing on the rim of a large disk that is rotating at an angular velocity of 0.480 about an axis through its center, Calculate the magnitude of the total angular momentum of the woman-plus-disk system
The kinetic energy of a proton is 80% of its total energy. What is the momentum in kg·m/s of the proton?
Waly Whacko claims to have invented a heat engine that will revolutionize industry. It runs between a hot source at 300oC and a cold sink at 25oC. What is the actual maximum efficiency of his engine
You are using a standard microscope with a 0.10NA 4x objective and switch to a 0.65NA 40x objective. What are the acceptance angles for each
You want to visit your friend Ford Prefect, who lives in the vicinity of Betelgeuse, 425 light-years from Earth (that is, light takes 425 years to arrive from Betelgeuse). What is the distance between Betelgeuse and Earth
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