Answer:
A) must equal angle of reflection
Explanation:
"The angle of incidence is equal to the angle of reflection". This is true according to the first law of reflection. For this to be totally true, the plane surface in consideration must be a smooth surface. Since it is a law, it cannot be changed because it has been proved to be true.
Note that the angle of incidence is the angle between the incidence ray and the normal ray(this ray is perpendicular to the surface) while the angle of reflection is the angle between the reflected ray and the normal.
Answer:
Approximately at below the horizon.
- Horizontal component of velocity: .
- Vertical component of velocity: (downwards.)
(Assumption: air resistance on the ball is negligible; .)
Explanation:
Assume that the air resistance on the ball is negligible. The horizontal component of the velocity of the ball would stay the same at until the ball reaches the ground.
On the other hand, the vertical component of the ball would increase (downwards) at a rate of (where is the acceleration due to gravity.) In , the vertical component of the velocity of this ball would have increased by .
However, right after the ball rolled off the edge of the table, the vertical component of the velocity of this ball was . Hence, after the ball rolled off the table, the vertical component of the velocity of this ball would be .
Calculate the magnitude of the velocity of this ball. Let and and denote the horizontal and vertical component of the velocity of this ball, respectively. The magnitude of the velocity of this ball would be .
At after the ball rolled off the table, while . Calculate the magnitude of the velocity of the ball at this moment:
.
Calculate the angle between the horizon and the velocity of the ball (a vector) at that moment. Let denote that angle.
.
For the vector representing the velocity of this ball:
.
Calculate the size of this angle:
.
Notice that the vertical component of the velocity of this ball at that moment points downwards (towards the ground.) Hence, the corresponding velocity should point below the horizon.
Answer:
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If you match the amount of static friction that can be generated when the object is at rest, it will not move because there is zero force the force has to be greater that the static friction in order to have it include motion. But if there was any more force will cause acceleration otherwise if it was lower force it will deceleration.
<h3><u>Answer;</u></h3>
Potassium chloride
<h3><u>Explanation;</u></h3>
- Potassium Chloride is an ionic compound and has ionic bond which is stronger than covalent bond in ethyl alcohol,water ,ammonia, and thus has the highest boiling point .
- ionic bond is a type of bond that results from the transfer of electrons between metallic atoms and non-metallic atoms.