A crate is pulled with a force of 165 N at an angle 30 ° northwest. What is the resultant horizontal force on the crate?
1 answer:
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Answer:
The measure of angle B equals the measure of angle C.
Explanation:
When a ray of light falls on a smooth polished surface and the light ray bounces back, it is called the reflection of light.
There are two laws of reflection;
1) The incident ray and reflected ray and normal all lie in the same plane.
2) The angle of incidence is equal to angle of reflection.
Here angle of incidence is represented by B and angle of reflection is by C.
So according to law of reflection the measure of angle B equals the measure of angle C.
Answer:
Explanation:
Let's assume that an object is launched straight upward in a gravitational field. Its initial kinetic energy is given by
(1)
where m is the mass and v is the initial speed.
As the object goes higher, its kinetic energy decreases and it is converted into gravitational potential energy, since the total mechanical energy (sum of kinetic and potential energy) must remain constant:
At the highest point of the trajectory, the speed of the object is zero (v=0), so the kinetic energy is also zero (K=0), which means that all the kinetic energy has been converted into potential energy:
(2)
where g is the gravitational acceleration and h is the maximum height of the object.
Due to conservation of energy, we can write that (1) and (2) are equal, so:
from which we can derive an expression for the maximum height reached by the object