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2 years ago

I need help with the following three physics problems please!

Physics

1 answer:

omeli [17]2 years ago

3 0

None of these is a Physics problem. The numbers, and the fractions that
they appear in, might have come from Physics problems, but these are
nothing more than arithmetic exercises, and they can be whipped out
in a hurry with a little bit of fancy calculator work. You don't have to
know any Physics in order to answer any of these.

The first one is 2.7 x 10⁻²⁴ Newton.

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2 years ago

A 2 cm tall object is placed 30cm in front of a concave mirror with focal length of 25 cm. What is the height of the image?

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Answer:

$- 10$ cm

Explanation:

$h_{o}$ = height of the object = 2 cm

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$d_{o}$ = distance of the object from the mirror = 30 cm

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$d_{i}$ = image distance

using the mirror equation

$\frac{1}{d_{o}} + \frac{1}{d_{i}} = \frac{1}{f}$

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$h_{i} = - 10$ cm

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Newton's second law tells you:

Sum of forces on an object = ma

Here, the forces acting on the bundle are the tension in the string and the force of gravity, these two must combine to yield the acceleration of the bundle.

So we have:

T-mg = ma

or T=m(g+a)

We know m=8.7kg, we need to find a from the information

starting from rest, an accelerating object covers distance according to:

dist = 1/2 at^2 

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Thus, the tension in the string is:

T = m(g+a)
= 8.7kg(9.8m/s/s+0.62m/s/s)

T = 90.654 N

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

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2 years ago