Answer:
<em>The apple's potential energy is 0.9555 Joule</em>
Explanation:
<u>Gravitational Potential Energy</u>
Gravitational potential energy is the energy stored in an object because of its vertical position or height in a gravitational field.
It can be calculated with the equation:
![U=m.g.h](https://tex.z-dn.net/?f=U%3Dm.g.h)
Where m is the mass of the object, h is the height with respect to a fixed reference, and g is the acceleration of gravity, or 9.8 m/s^2.
The apple has a mass of m=0.15 kg and it's located at a height of h=0.65 m. Calculate the potential energy:
![U=0.15\ kg\cdot 9.8\ m/s^2\cdot 0.65\ m](https://tex.z-dn.net/?f=U%3D0.15%5C%20kg%5Ccdot%209.8%5C%20m%2Fs%5E2%5Ccdot%200.65%5C%20m)
![U=0.9555\ J](https://tex.z-dn.net/?f=U%3D0.9555%5C%20J)
The apple's potential energy is 0.9555 Joule
Answer:
The light ray is reflected back into the opposite direction
Explanation:
The law of reflection states that when a light ray hits a reflecting surface, the angle of reflection (measured between the reflected ray and the normal to the surface) is equal to the angle of incidence (measured between the incident ray and the normal to the surface).
In this case, we have a light ray that it is incident along the normal to the surface: this means that the angle of incidence is
. As per the law of reflection, the angle of reflection must be the same:
. This means that the reflected ray is also along the normal, just in the opposite direction to that of the incident ray.
Potential energy is measured using formula Ep=mgh
m=mass (kg)
g= acceleration due to gravity (which is 9.8 on earth)
h= height in metres above ground
For this question
m=0.1
g=9.8
h=1
So Ep=0.1(9.8)(1)
Ep=0.98 Joules
When it is dropped all of this potential energy is converted into kinetic energy which can be measured using formula
Ek=1/2m(v^2) (v=final velocity)
Since all potential energy in this q is converted to kinetic we know Ek=0.98Joules and our mass is the same (0.1kg)
So when we sub everything in we get
0.98=1/2(0.1)(v^2)
0.98=0.05(v^2)||divide both side by 0.05
19.6=v^2 ||square root both sides
v=4.4 m/s
Answer:150Nm
Explanation:
Force=50.0N distance=3.00m
Work=force x distance
Work=50 x 3
Work=150Nm