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The lenses used in a compound microscope have powers of + 90 D and + 60 D . If a total magnification of -250 x is desired, what should be the distance between the two lenses?
Three resistors are connected in parallel to a 12.0 V battery. Two of the resistance values are 58\Omega and 42\Omega. what is the value of the third resistor
Find the speed of a satellite moving around the earth in a circular orbit that has a radius equal to four times the earth's radius of 6.38 multiply.gif 106 m.
A block of mass 2.0 kg is pushed against a vertical wall by a horizontal push (P) of 50.0 N. The block does NOT move. Assuming that the coefficient of the static friction, k, is equal to 0.60. Find the force AND the direction of the friction.
A football punter accelerates a football from rest to a speed of 10 m/s during the time in which his toe is in contact with the ball (about 0.17 s)
We can roughly model a gymnastic tumbler as a uniform solid cylinder of mass 72.0kg and diameter 1.20m. What percent of his total kinetic energy is rotational
A 528 Hz sound wave travels through a substance. What is the speed of sound in the substance
Two masses, M1=20.00 kg and M2=12.00 kg, are 50.00 m apart. Find the location of center of mass of the two masses
In a series RCL circuit the generator is set to a frequency that is not the resonant frequency. What is the frequency of the generator
A 40-g object connected to a spring with a force constant of 30 N/m oscillates with an amplitude of 8 cm on a frictionless, horizontal surface. Find the total energy of the system
Suppose that a block of mass m = 9.0 kg moving with speed V is behind a block of mass M = 27 kg and speed of 0.5 m/s, How much kinetic energy of the blocks is lost due to the collision
An intern pushes a 72 kg patient on a 15 kg gurney, producing an acceleration of 0.60 m/s2. How much work does the intern do by pushing the patient and gurney through a distance of 2.5 m
An experiment requires sound intensity 1.55 W/m2 at the distance of 3.61 m in any direction from a speaker. What total sound power is required
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