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A telescope consists of a mirror with radius of curvature 4.5 m and an eyepiece. If an astronomer would like the telescope to have a magnification of 181, what focal length eyepiece should he use?
An airplane pilot with a mass of 90.0-kg pulls out of a dive by following the arc of a circle whose radius is 300 m at a constant speed of 190 km/h. find the force exerted on the pilot by the airplane seat
A standard baseball has a circumference of approximately 23 cm. If a baseball had the same mass per unit volume as a neutron or a proton, about what would its mass be?
Two masses are joined by a massless string. A 27-N force applied vertically to the upper mass gives the system a constant upward acceleration of 3.5m/s^2. If the string tension is 19-N , what is the bigger of two masses
two equally charged insulating balls each weigh 0.42 g and hang from a common point by identical threads 40 cm long.
At the same instant that a 2.0-kg ball is dropped from 50 m above Earth, a second ball, What is the velocity of the center-of-mass of the two-ball system 0.5 seconds after the balls are released
question1determine the force needed to hold a 1000 pounds car on an inclined plane that makes angle of 30 degree with
he box is taken up a mountain where the air pressure outside the box is 8.00 104 Pa. The inside of the box is completely evacuated. Illustrate what is the magnitude of the force required to pull the lid off the box?
0.0024 J of energy are stored in a parallel-plate capacitor whose plates each have area 0.30 m2 and are 1.5 mm apart. What is the electric field energy density between the plates
A wire of thickness d = 5 mm is tightly wound 200 times around a cylindrical core to form a solenoid. What is the the magnetic field on the axis of the solenoid
A 53.5 kg pole vaulter running at 11.4 m/s vaults over the bar. Her speed when she is over the bar is 1.14 m/s. determine her altitude as she crosses the bar
what are the formulas for these questions1. if stiffness of the medium inceases and the time remains unchanged what
two identical metal spheres a and b are connected by a metal rod. both are initially neutral. 1.6times1012 electrons
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