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The work done by a friction force is:
a) Always positive
b) Always negative
c) Always zero
d) Either positive or negative depending upon the situation.
Ans: The work done by a friction force is always negative.
Proton was discovered by: (1)Chadwick (2)Thomson (3)Goldstein (4)Bohr Ans: (3)Goldstein
Doppler Effect Describing the classical Doppler Effect for sound waves. The Doppler Effect is a means through that wave properties (specifically frequencies) are influenced thr
find the dimensions of the following i.power ii.velocity iii.force
A 10 V ZENER DIODE ALONG WITH A SERIES RESISTOR IS CONNECTED ACROSS A 40 V SUPPLY.CALCULATE THE MINIMUM VALUE OF THE RESISTOR REQUIRED,IF THE MAXIMUM ZENER CURRENT IS 50 mA?
a transformer has a primary coil with 200 turns, and a secondary coil with 2000 turns. The input voltage is 120 VAC, and runs at 1800 watts. What is the output voltage?
show that work is a path function not a property
A baseball bat strikes a ball with a force of 30 newtons. If the ball was in contact with the bat for 1/10 of a second, What impulse did the ball receive? Ans - 3 Newt
How does electricity affect the phosphorus cycle?
Batch fermentation For aerobic cultivation of yeast the cell mass concentration, X t , and the concentration of the limiting substrate component (glucose), S t , has been deter
Derive the mathematical expression PV r = constant for an ideal gas undergoing adiabatic reversible expansion.
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