Based on the Newton's second law of motion, the value of the net force acting on the object is equal to the product of the mass and the acceleration due to gravity. If we let a be the acceleration due to gravity, the equation that would allow us to calculate it's value is,
W = m x a
where W is weight, m is mass, and a is acceleration. Substituting the known values,
40 kg m/s² = (10 kg) x a
Calculating for the value of a from the equation will give us an answer equal to 4.
ANSWER: 4 m/s².
The refractive index is the ratio of the speed in a vacuum to the speed of light in the given medium. If the refractive index is too low, there will not be a large bending, or deviation, of the light beam from its original path.
The small deviation will make it difficult to carry out the experiment, and is more likely to cause errors. Therefore, larger refractive indexes should be used, in order to ensure that the bending of the light beams is easily traceable.
I feel that they should be regulated, mostly because its not safe for your ears to listen to such loud music. For example, if you were in the front of the concert you are more likely to get damage of your hearing more then the people in the back who have a slight chance.
Now, our ears can only handle up to 85 dB, thats why when you shoot a gun in a shooting range (if you've been at one) you wear hearplugs to protect you from the roughly 140-dB it gives off when fired. At rock concerts roughly 120-dB only 35-dB higher then what we are able to handle. The limit should be at most 90 dB because it is not too high and wont give us full on hearing damage to us in the future.
Answer:
ke = 1/2mv^2
= 1/2 * 1200 * 22^2
= 600 * 484
= 290400 J
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