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Two identical conduction spheres are mounted on insulating rods, initially uncharged. A positivly charged rod is brought near them.Then, one of the two shpheres is displaced momentarily so that thetwo spheres touch briefly. After this, one shphere is found to havea net charge of 2.9nC. What is the charge in the second sphere? (Itwill be positive.)
A person stands on a scale in an elevator. As the elevator starts, the scale has a constant reading of 600 N. Determine the weight of the person
At what angle have to the laser beam in the diagram be aimed at mirrored ceiling in order to hit the midpoint of the far wall? The length of the room is a=4.9 m and its height is b=3.00 m.
A string length 2.0 m and linear mass density 25.0 mg/m vibrates at a fundamental frequency of 450.0 Hz. What is the speed of the transverse strin waves
When it rains, water vapor in the air condenses into liquid water, and energy is released. (a) How much energy is released when 0.0285 m (1.12 inch) of rain falls over an area of 2.59×106 m2 (one square mile)? (b) If the average energy needed to h..
A step-down transformer produced a voltage of 9.0 V across the secondary coil when the voltage on the primary coil is 120 V. Whatvoltage would appear across the primary coil of this transformer if120 V was applied to the secondary coil?
Two stars in a binary system orbit around their center of mass. The centers of the two stars are 7.77x1011 m apart. The larger of the two stars has a mass of 3.63x1030 kg, and its center is 2.03x1011 m from the system's center of mass. What is the ma..
A conducting sphere of radius 23.0 cm has an unknown positive charge distributed uniformly over its surface. What is the charge
Derive from the Uncertainty Principle a formula for the relative spread of the spectral line that corresponds to the longest wavelength of the Lyman series.
A reflecting telescope is built with a 10-cm-diameter mirror having a 1.00 m focal length. What is the magnification of the telescope
Pure silicon is used as a photon detector. An incoming photon canstrike the surface and excite electrons from the valence band tothe conduction band, where they can be counted.
A truck is traveling around a level curve of radius 104.2 m at an instantaneous speed of 20.4 m/s. The truck's speed is increasing at the rate of 2.18 m/s2. Discover the magnitude of the frictional force on a 105.2 kg crate resting on the floor of th..
Starting with a pure Sr-90 sample at time t=0, a researcher finds that the Y-90 activity is 22.9 mCi at t = 1 day. What was the activity at t = 0
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