A car travels at a constant velocity of 20.0 meters/second for 15 seconds. What is the power of the car if the initial force app
2 answers:
The correct answer to the question is 1900 Joule.
CALCULATION:
As per the question, the velocity of the car v = 20.0 m/s.
The time taken by the car t = 15 seconds.
The initial force applied on the car F = 95 N.
We are asked to calculate the power of the car.
Let the displacement of the car is denoted as S.
Let the power of the car is P.
The power of a car is defined as the word done by the car per unit time.
Hence, the power P =
=
=
=
=
Here, is the angle between force and velocity.
If , then P = Fv.
Hence, the power of the car is calculated as -
P = 95 N × 20.0 m/s
= 1900 Joule.
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Before going to answer this question first we have to understand reflection and laws of reflection.
Reflection is the optical phenomenon in which light will bounce back to the same medium from which it had originated .
Whenever a light ray will incident on a mirror or any reflecting surface, it will be reflected. The ray which falls on the reflecting surface is called incident ray and the ray which is reflected is called reflected ray.
Let us consider a normal to the point of incidence.The angle made by incident ray with the normal is called angle of incidence.Let it be denoted as[ i ]
The angle made by the reflected ray with the normal is called angle of incidence.Let it be denoted as [r]
There are two types of reflection.One is called regular and other one is called as irregular.The laws of reflection is valid for both the types of reflection.
There are two laws of reflection.
FIRST LAW -It states that the incident ray,reflected ray and the normal to the point of incidence,all lie in one plane.
SECOND LAW- It states that that the angle of incidence is equal to the angle of reflection irrespective of the type of reflection.i.e i =r
Hence the correct answer will be angle of reflection.
