In physics<span>, a force is said to do </span>work if, when acting, there is a displacement of the point of application in the direction of the force. <span>Nonconservative force for this question refers to FRICTIONAL force. </span>
<span>By conservation of energy, </span>
<span>Work done by Frictional force = Kinetic energy = 1/2(17000)(82)^2 = 57MJ </span>
Answer:
True
Explanation:
A concave mirror produces real and inverted image when object placed at different locations beyond focus of the mirror.
A concave mirror produces virtual and erect and magnified image when an object placed between focus and the pole of the mirror.
This question is incomplete, the complete question is;
Unpolarized light passes through two Polaroid sheets. The transmission axis of the second polarizing filter makes an angle of 34° with the axis of the first polarizer. What fraction of the original unpolarized light is transmitted through the second polarizing filter?
Answer: the fraction of the original unpolarized light transmitted through the second polarizing filter is 0.343
Explanation:
We know that when Unpolarized light passes through first polarizer, it's intensity will be reduced to half i.e
I1 = I0/2
Now after that when light passes through 2nd polarizer, Intensity will be;
I2 = I1 × (cos A1)²
but I1 = I0/2
so
I2 = (I0/2) × (cos A1)²
I2/I0 = 0.5 × (cos A1)²
In the question we were given that; The transmission axis of the second polarizing filter makes an angle of 34° with the axis of the first polarizer
so A = 34°
so we substitute
I2/I0 = 0.5 × (cos 34)²
I2/I0 = 0.343
Therefore the fraction of the original unpolarized light transmitted through the second polarizing filter is 0.343
Answer:
where F is the friction force that is the same for both boxes
Explanation:
So the same boxes at the same mass m would create a same friction force, let this force be F. The net force in the first and 2nd cases would be
- 1st case: F1 - F
- 2nd case F2 - F
According to Newton 2nd law, this net would make acceleration
- 1st case 
- 2nd case
Since 
Answer:
The mechanical energy of the helicopter is 
.
Explanation:
It is given that,
Mass of the helicopter, m = 3250 kg
Speed of the helicopter, v = 56.9 m/s
Position of the helicopter, h = 185 m
The energy possessed by an object due to its motion is called its kinetic energy. It is given by :
The energy possessed by an object due to its position is called its potential energy. It is given by :
The sum of kinetic and potential energy is called mechanical energy of the system. It is given by :
or
So, the mechanical energy of the helicopter is . Hence, this is the required solution.
