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A nearsighted patient's far point is 0.645 m from her eyes. She is able to see distant objects in focus when wearing glasses by a refractive power of -1.6 diopters. What is the distance among her eyes and the glasses?
A 426 kg bear grasping a vertical tree slides down at constant velocity. The acceleration of gravity is 10m/s2. What is the friction force that acts on the bear? Answer in units of N.
A heat pump has a coefficient of performance of 3.75 and operates with a power consumption of 6.93 103 W. How much energy does it extract from the outside air
A 9 m, 220 N uniform ladders rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.55, and the ladder makes a 50° angle with ground. How far up the ladder can an 850 N person climb before ladder beg..
A 0.500kg mass oscillates in simple harmonic motion at the endof a spring of constant 150N/m. What is the maximum speed of the mass (in m/s)
If the height of the water slide is h = 3.2m, and the person's initial speed at point A is 0.54m/s, what is the newhorizontal distance between the base of the slide and thesplashdown point of the person?
A string of a violin is 32 cm long between fixed points with a fundamental frequency of 440 Hz and a mass per unit length of 7.2 x 10-4 kg/m. What are the wave speed and the tension in the string
a proton traveling at 3.6 kms suddenly enters a uniform magnetic field of 0.75 t making an angle 55? with the direction
An aluminum wire has the same resistance as a copper wire of the same length. Find the ratio of the aluminum wire's diameter tothe copper wire's diameter.
Two balls, of masses = 60 and = 70, are suspended. The lighter ball is pulled away to a 67 angle with the vertical and released. Suppose that the positive axis is directed to the right.
A rock is dropped off the side of a bridge and hits the water below 5.7 s later. What was the rock's velocity when it hit the water
What Current densities would produce the vector potentials A = ks^n in the phi direction (where k is constant and n is integer) in cylindrical coordinates? Are there any n values which cannot be connected to a current density?
Two +1 microCoulomb point charges are located on the x-axis, at x =2m and at x = -2m. Find the magnitude of the electric field at the origin
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