What is a prediction in science terms
2 answers:
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The two forces acting on your body are the weight and the normal force
Explanation:
As you sit on your chair in front of the computer, there are 2 forces acting on you:
- The force of gravity, of magnitude
(where m is your mass and
is the acceleration of gravity), acting downward
- The normal reaction exerted by the chair on your body, N, acting upward, and balancing your weight
We can apply Newton's second law to this situation; the law states that the net force acting on an object is equal to the product between the mass of the object and its acceleration:
where
is the net force
m is the mass
a is the acceleration
For your body sitting on the chair,
we also know that your body is at rest, so the acceleration is zero:
This means that the net force is zero, and therefore:
Learn more about Newton's second law of motion:
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Answer:
Explanation:
Given that
Diameter of laser beam d= 2.4 mm
Radius of laser beam r= 1.2 mm
Power P =1.7 W
We know that intensity(I) of laser beam given as follows
Now by putting the values
So
So the intensity at 1.76 m away from laser