Answer:
Height will be 5.127 m
Explanation:
We have given mass m = 49 kg
Speed over the bar v = 10 m /sec
Acceleration due to gravity 
Kinetic energy on the ground 
Potential energy on the ground
(as height will be zero )
Speed above the bar = 0.7 m /sec
So kinetic energy above the bar 
Potential energy above the bar = mgh
From energy conservation
Total kinetic energy = total potential energy
So 

Answer:

Explanation:
The energy, E, from a capacitor, with capacitance, C, and voltage V is:


If we increase the Voltage, the Energy increase also:


The voltage difference:


This is called refraction. Some common examples of refraction are a straw appearing bent or cut once it enters water in a glass.
Answer:
Moment is the product of force and its perpendicular distance from a point along its line of action.
The net moments on clockwise and anticlockwise is zero at a point.
The net force applied on a spanner handle is equal to the moment of the rotation
Answer: 0.192 N/m
Explanation:
Well, generally when a Hooke's Law experiment is performed the plot is in fact Force vs Displacement, being the Force (in units of Newtons) in the Y-axis and the Displacement (in units of meters) in the X-axis.
In addition, if we add a linear fit the resultant equation will be the Line equation of the form:

Where
is the slope and
is the point where the line intersects the Y-axis.
So, if the equation is:

The slope of this line is
which is also the spring constant
.