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KIM [24]
3 years ago
12

a croquet ball, after being hit by a mallet,slows down and stops. do the velocity and acceleration of the ball have the same sig

ns
Physics
1 answer:
NeTakaya3 years ago
7 0
It depends. While slowing down acceleration will have negative sign but the velocity depends upon the initial point sonce velocity is a vector quantity if it is going back towards the initial position it will reduce but if it passes the initial position and goes back it will have negative sign....so it totally depends upon the situation.
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A Van de Graaff generator is one of the original particle accelerators and can be used to accelerate charged particles like prot
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595391.482946 m/s

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E = Energy = 1.85 keV

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Velocity of proton is given by

v=\sqrt{\dfrac{2E}{m}}\\\Rightarrow v=\sqrt{\dfrac{2\times 1.85\times 10^3\times 1.6\times 10^{-19}}{1.67\times 10^{-27}}}\\\Rightarrow v=595391.482946\ m/s

The speed of the proton is 595391.482946 m/s

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I=\dfrac{\Delta Q}{t}\\\Rightarrow \Delta Q=It\\\Rightarrow \Delta Q=5.15\times 10^{-3}\times (1\ sec)\\\Rightarrow Q=5.15\times 10^{-3}\ C

Number of protons is

n=\dfrac{Q}{e}\\\Rightarrow n=\dfrac{5.15\times 10^{-3}}{1.6\times 10^{-19}}\\\Rightarrow n=3.21875\times 10^{6}\ protons

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