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The hydrogen atom consists of a proton of mass 1.67 x 10^-27 kg and an orbiting electron of mass 9.11 x 10^-31 kg. In one of its orbits, the electron is 5.3 x 10^-11 m from the proton. What is the mutual attractive gravitational force between the electron and proton?
A) 9.3 x 10^-47 N
B) 7.0 x 10^-47 N
C) 5.4 x 10^-47 N
D) 1.8 x 10^-47 N
E) 3.6 x 10-47 N
A hunter wishes to cross a river that is 2.0 km wide and flows with a speed of 5.0 km/h parallel to its banks. What is the minimum time necessary for crossing
opening switches in highly inductive circuits can be dangerous even with low-voltage power sources. to see why consider
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a wooden crate of mass 25 kg is sitting on a horizontal cement floor. then one end of a horizontal pulley is attached
Suppose you are riding a stationary exercise bicycle, and the electronic meter indicates that the wheel is rotating at 9.50 rad/s. how far would you have gone if the bike could move
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Two conductors having net charges of +12.0 µC and -12.0 µC have a potential difference of 12.0 V between them. Determine the capacitance of the system
An engineer is designing a pacemaker for cardiac patients. For the 20 year old woman, how many times must device have to beat for her to have a normal life expectancy.
A helicopter is rising at 4.60 m/s when a bag of its cargo is dropped. The bag falls for 2.50 s. (suppose that the positive direction is upward.)
A 120-V motor has mechanical power output of 3.60 hp. It is 87.0% efficient in converting power that it takes in by electrical transmission into mechanical power. Find the current in the motor
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