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Stolb23 [73]
3 years ago
8

An object is moving forward with a constant velocity. Which statement about this object MUST be true?

Physics
1 answer:
Greeley [361]3 years ago
7 0

If the object's <em>velocity is constant</em> ... (it's speed isn't changing AND it's moving in a straight line) ... then the net force on the object is zero.<em> (D)</em>

Either there are no forces at all acting on the object, OR there are forces on it but they're 'balanced' ... when you add up all of their sizes and directions, they just exactly cancel each other out, and they have the SAME EFFECT on the object as if there were no forces at all.

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1. If we increase the distance to twice it's original value, the light intensity is reduced by one-fourth, the light intensity would be:
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3. average energy density is inversely proportional to the square of the distance, so the new average energy density is:
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5 0
3 years ago
A block is resting on a platform that is rotating at an angular speed of 2.4 rad/s. The coefficient of static friction between t
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Answer:

r = 0m is the Minimum distance from the axis at which the block can remain in place wothout skidding.

Explanation:

From a sum of forces:

Ff = m*a   where Ff = μ * N    and a = \frac{V^2}{r}=\omega^2*r

N - m*g = 0   So, N = m*g.   Replacing everything on the original equation:

\mu*m*g = m*\omega^2*r   (eq2)

Solving for r:

r = \frac{\mu*g}{\omega^2}=1.41m

If we analyze eq2 you can conclude that as r grows, the friction has to grow (assuming that ω is constant), so the smallest distance would be 0 and the greatest 1.41m. Beyond that distance, μ has to be greater than 0.83.

4 0
3 years ago
An object that has what acting on it acts as if there were no forces acting on it at all
Mumz [18]
Either no forces or a balanced group of forces
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3 0
3 years ago
In this ecosystem, squirrels find and eat acorns from trees. What would happen to the balance of the ecosystem if populations of
Marizza181 [45]

<em><u>Answer</u></em>

The answer would be B.

7 0
3 years ago
This rock, known as balance rock, sits on a thin spike of rock in a canyon in idaho. explain the forces that keep the rock balan
Evgen [1.6K]

Answer:

Action force and Reaction force

Explanation:

The action force which is the balanced rock pushing down due to gravity and the reaction force pushing the equal amount of force. These two things are stated in Newtons third law, where he states that "Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first." Also, he states that "all forces acts in pairs," meaning that every force exerted, there is an opposite force on the first.

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3 years ago
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