Answer:
Explanation:
The Planck Eistein relation, states that the energy of a photon is proportional to its frequency:
h is the Plank constant.The frequency of a photon is defined as the speed of light over its wavelength:
Replacing (2) in (1):
Answer:
It is changing at the same rate at all points.
A velocity vector represents the rate of change of the position of an object. The magnitude of a velocity vector gives the speed of an object while the vector direction gives its direction. Velocity vectors can be added or subtracted according to the principles of vector addition.
Explanation:
Velocity as a Vector Quantity
Velocity is a vector quantity that refers to "the rate at which an object changes its position." Imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. While this might result in a frenzy of activity, it would result in a zero velocity. Because the person always returns to the original position, the motion would never result in a change in position. Since velocity is defined as the rate at which the position changes, this motion results in zero velocity. If a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. Every step must go into moving that person further from where he or she started. For certain, the person should never change directions and begin to return to the starting position.
Velocity is a vector quantity. As such, velocity is direction aware. When evaluating the velocity of an object, one must keep track of direction. It would not be enough to say that an object has a velocity of 55 mi/hr. One must include direction information in order to fully describe the velocity of the object. For instance, you must describe an object's velocity as being 55 mi/hr, east. This is one of the essential differences between speed and velocity. Speed is a scalar quantity and does not keep track of direction; velocity is a vector quantity and is direction aware.
Answer
given,
mass of the dragster = 835 Kg
initial speed, u = 0 m/s
final speed, v = 110 km/h = 110 x 0.278 = 30.58 m/s
time, t = 0.90 s
a) Change in momentum
Δ P = m v - m u
Δ P = 835 x ( 30.58 - 0 )
Δ P = 25534.3 kg.m/s
b) average force exerted on the car
change in momentum = Force x time
25534.3 = F x 0.9
F = 28371.44 N
c) The exerted force is due to friction because the motion of the dragster is because of friction.
The electric potential at certain point is given by,v=-7.5x²-3x ,where v is in volts and x is in meters. then the electric field at that point is -(15x+3).
Given,
The electric potential at certain point is given by,
v=-7.5x²-3x .
where v is in volts and x is in meters.
We know,
electric potential (v) =electric field ×radius
Electric potential is defined as the amount of work needed to move a charge from reference point to the specific point against an electric field.
Also, electric field (E) =dv/dx
Electric field at a point is the force experienced by the unit positive charge placed at that point.
E=d(-7.5x²-3x)/dx=-15x-3
Thus ,the electric field at that point is given by -(15x+3 ).
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Disclaimer:the data in the question is incorrect .here is the complete question .
Question: the electric potential at a certain point is given by v=-(7.5x²+3x).where v is in volts and x is in meters.what is the electric field at that point?
