None of those choices is a device commonly used to detect
the presence of a static electric charge. One of them is a
process or technique, and is not even a 'device'.
A couple of them might be jerry-rigged to detect charge, but
that is not their intended purpose or design, and it would take
some ingenuity. They're certainly not "commonly used" in that
application.
-- Compass . . . a device that detects the presence of a magnetic
field and displays its direction.
-- Voltmeter . . . a device that displays the presence and measures
the magnitude and direction of electric potential
difference between two points.
-- Electrophoresis . . . a method of separating macro molecules
according to their size.
-- Galvanometer . . . a device used to detect the presence and
measure the magnitude and direction of
small electric currents.
Answer:
Your answer is: D) 110N
Hope this helped : )
Explanation:
In order for the wood to sink, it's specific gravity must equal 1 (or greater).
Specific gravity = .6 kg/m^3= Mass/volume
F (Newtons or kg x m/s^2) = Mass*9.8m/s^2.
Therefore, Mass = 160 N / 9.8 m/s^2= 16.32 kg
Volume = Mass/Specific Gravity = 16.32kg/.6 kg/m^3 = 27.2 m^3
Desired Specific gravity = 1 = (Mass + additional force/9.8m/s^2)/Volume = (16.32 kg +X / 9.8m/s^2)/27.2m^3
Solving for the additional force: X = 106.66...N
The answer is D, 110 N will be required to sink the block of wood.
Answer:
4.9
Explanation:
Velocity half second before maximum height = Velocity half second after maximum height (Return journey)
For downward journey :
Initial velocity u=0 m/s
We have g=9.8 m/s
Time t= ½s
s
Thus velocity after half second v=u+gt
v=0+9.8× ½ =4.9m/s
The answer is A
Hope it helps!
<span>C) An object accelerates in the same direction as that of the force applied.</span>