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A grade school student plans to build a 34-power telescope as a science fair project. She starts with a magnifying glass with a focal length of 4.9cm as the eyepiece. What focal length is needed for her objective lens in meters?
An airplane propeller is rotating at 1250rpm. Compute the propeller's angular velocity
A couple of astronauts agree to rendezvous in space after hours. Their plan is to let gravity bring them together. Find the his and her initial acceleration
A very long solenoid of circular cross section with radius R = 5.30 cm has n = 69.0 turns/cm. An electron is sitting just outside the solenoid, at a distance r = 5.80 cm from the solenoid axis. What is the magnitude of the force on the electron as..
In the Bohr model of the hydrogen atom, an electron moves in a circular path around a proton. The speed of the electron is approximately 2.19 106 m/s. Find the centripetal acceleration of the electron
A proton moves at a speed of 870 m/s in a direction perpendicular to a magnetic field with a magnitude of 0.70 T
A capacitor is charged to a potential of 12.0 V and is then connected to a voltmeter having an internal resistance of 3.10M, What is the time constant of the circuit
A certain kind of glass has an index of refraction of 1.648 for blue light of wavelength 439 nm and an index of refraction of 1.619 for red light of wavelength 677 nm
The dipole moment of a water molecule in liquid water is 6.2×10-30 C•m, and the effective diameter of the water molecule is 2.8×10-10 m. In an earlier homework problem the effective dipole charge separation for water was calculated as 1.9×10-11 m.
Suppose that the spring is ideal and that the distance by which the spring is compressed is negligible compared to H.
when jim abd rob ride bicycles, jim can only accelerate at three quarters the acceleration of Rob. Both start from rest at the bottom of a long straight road with constant upward slope. If rob takes 5.7 minutes to react the top, how much earlier s..
If one resistor of a particular size is connected to a battery, 2.5A flow from the battery, How much current flows through one of the 10 resistors
the motor slows from 80 rad/s to 40rad/s while the turning the drum through an angle of 120 radians. Illustrate what is the magnitude of the angular acceleration of the motor?
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