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sergeinik [125]
4 years ago
7

A geologist is observing the side of a mountain for evidence of erosion when a large rock begins to accelerate down the mountain

side. Using his knowledge of the laws of physics, what change should he conclude caused the rock to accelerate?
A. When stationary the force of gravity on the rock was less, and when accelerating it was greater.

B. When stationary there were no forces on the rock and when accelerating there were forces on it.

C. When stationary there were equal forces on the top and bottom of the rock, but not on the left and right sides.

D. When stationary the rock did not have a net force on it, and when accelerating it did.
Physics
1 answer:
umka2103 [35]4 years ago
8 0
I think it's A.<span>When stationary the force of gravity on the rock was less, and when accelerating it was greater. The rock was in place, gravity was simply making it stay on Earths surface, for the time being, until something unbalanced it</span>
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Is it possible to have motion in the absence of a net force?
Vsevolod [243]

Answer:

It is impossible...

Explanation:

Under no circumstances this is possible because of the Newton’s 1st law of motion that states that a body shall continue its motion forever except the net fore is zero. When two opposing forces contract each other, they cancel out the action of each other and ultimately the net force become zero. If one body has a slightly more or less force then the net force will not be zero and the net magnitude of force will have a direction of motion.

8 0
4 years ago
At which point is the kinetic energy the greatest?
pshichka [43]

Answer:

X

Explanation:

ur welcome

6 0
3 years ago
PLEASE HELP ASAP!!!!!!!!!!!!
lianna [129]

The first choice on the list is the correct one.

7 0
4 years ago
An elf pushes a sleigh with force of 9N over a distance of 11m. How much work did the elf. Do on the sleigh
Whitepunk [10]

Answer:

<h2>99 J</h2>

Explanation:

The work done by an object can be found by using the formula

workdone = force × distance

From the question we have

workdone = 9 × 11

We have the final answer as

<h3>99 J</h3>

Hope this helps you

5 0
3 years ago
8. Find the momentum of a photon in eV/c and in Kg. m/s if the wavelength is (a) 400nm ; (b) 1 Å = 0.1 nm, (c) 3 cm ; and (d) 2
nataly862011 [7]
We use the formula: p = E/c where E = hc / λ. hence, p = h/  λ. where h is the Planck's constant: 6.62607004 × 10-34 m2 kg / s and <span>λ is the wavelenght. 
</span>
a) p = <span>6.62607004 × 10-34 m2 kg / s / 0.1 x10^-9 m = 6.62607 x 10-24 m kg/s
</span>b) p = 6.62607004 × 10-34 m2 kg / s / 3 x10^-2 m = 2.20869 <span>x 10-32 m kg/s
</span>b) p = 6.62607004 × 10-34 m2 kg / s / 2 x10^-9 m = 3.3130 <span>x 10-25 m kg/s</span>
7 0
3 years ago
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