Answer:c
Explanation:because when u push the oar back u go forward
Answer:
A. velocity and wavelength
Explanation:
- When a wave travels from one medium to another it undergoes a change in direction and this is referred to as refraction.
- Refraction is the bending of a wave or a change in direction of a wave as it travels from one medium to another. Refraction is accompanied by change in velocity and wavelength of a wave.
- Velocity of a wave is proportional to the wavelength of the wave therefore, if the velocity of a wave changes the the wavelength will also change proportionally to the velocity.
Answer:
a)
, b)
, c) 
Explanation:
a) The net torque is:

Let assume a constant angular acceleration, which is:



The moment of inertia of the wheel is:



b) The deceleration of the wheel is due to the friction force. The deceleration is:



The magnitude of the torque due to friction:


c) The total angular displacement is:



The total number of revolutions of the wheel is:



The electric flux is changed only if we change the charge.
<h3>What is the expression of electric flux?</h3>
- As per gauss law, total electric flux link through a surface is equal to (1/ε0) × charge.
- Mathematically, electric flux = q/ε0
- q = total charge enclosed by the gaussian surface
- Here the electric flux is directly proportional to the charge, so on changing charge, the electric flux changes.
Thus, we can conclude that the electric flux is changed only if we change the charge.
Learn more about the gauss law here:
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Answer:
The experiment to determine the coefficient of static friction between a rough block and an incline plane is detailed in the explanation.
Explanation:
A simple experiment is as follows:
Take a weight in which its mass is known and hold it with a roller at the end of the inclined plane with a rope.
Place the weight on the plane inclined horizontally with the ground, forming a zero degree angle.
Gradually lift the weight so that the angle of incline begins to increase.
Observe that the weight will begin to slide. This angle will be the angle theta.
In this way, the coefficient of friction will be calculated as the tangent of the angle theta.
Take a different weight and repeat the procedure to get different values of the coefficient of friction.
By averaging the coefficients of friction, a final value will be obtained.