Power
is the rate at which work is done. The SI unit for power is the watt (W), where 1 watt equals 1 joule/second (1 W=1 J/s). Because work is energy transfer, power is also the rate at which energy is expended.
What is the rate work done?
Power
is the rate at which work is done.
What is work done per time?
Power
is a rate at which work is done, or energy is used. It is equal to the amount of work done divided by the time it takes to do the work. The unit of power is the Watt (W), which is equal to a Joule per second (J/s).
What is the formula for work done?
To express this concept mathematically, the work W is equal to the force f times the distance d, or W = fd. If the force is being exerted at an angle θ to the displacement, the work done is
W = fd cos θ
.
How do you calculate work?
The formula for work is ,
work equals force times distance
. In this case, there is only one force acting upon the object: the force due to gravity. Plug in our given information for the distance to solve for the work done by gravity.
What is the 3 version of work formula?
Three quantities must be known in order to calculate the amount of work. Those three quantities are
force, displacement and the angle between the force and the displacement
.
What is the formula for energy?
The formula that links energy and power is:
Energy = Power x Time
. The unit of energy is the joule, the unit of power is the watt, and the unit of time is the second.
What is work and its unit?
Work is force applied over distance. … Work is a mechanical manifestation of energy. The standard unit of work is
the joule (J)
, equivalent to a newton – meter (N · m). This reduces to one kilogram-meter squared per second squared (kg · m
2
/s
2
or kg · m
2
· s
– 2
) in base International System of Units (SI) units.
What is the formula to calculate time?
To solve for time use the formula for time,
t = d/s
which means time equals distance divided by speed.
What is the formula for work and power?
Power equals work (J) divided by time (s)
. The SI unit for power is the watt (W), which equals 1 joule of work per second (J/s).
What is transferred when work is done?
When a force causes a body to move, work is being done on the object by the force. Work is the measure of
energy transfer
when a force ‘F’ moves an object through a distance ‘d’. So when work is done, energy has been transferred from one energy store to another, and so: energy transferred = work done.
What is D work formula?
Mathematically, the concept of work done W equals the force f times the distance (d), that is W = f. d and if the force is exerted at an angle θ to the displacement, then work done is calculated as
W = f . d cos θ
.
What happens to the body on which work is done?
Work done on a body is
equal to the increase in the energy of the body
, for work transfers energy to the body. If, however, the applied force is opposite to the motion of the object, the work is considered to be negative, implying that energy is taken from the object.
What is formula for mass?
Mass is always constant for a body. One way to calculate mass:
Mass = volume × density
. Weight is the measure of the gravitational force acting on a mass.
What is E mc2 used for?
The equation — E = mc
2
— means “
energy equals mass times the speed of light squared
.” It shows that energy (E) and mass (m) are interchangeable; they are different forms of the same thing. If mass is somehow totally converted into energy, it also shows how much energy would reside inside that mass: quite a lot.
What is formula of stress?
The stress equation is:
σ = F/A
.
F
denotes the force acting on a body and A denotes the area. Units of stress are the same as units of pressure – Pascals (symbol: Pa) or Newtons per squared meter. Positive stress means that the object is in tension – it “wants” to elongate.
