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3 years ago

If the forces acting on an object are balanced, wihat must be true about the motion of this object?

Physics

1 answer:

wolverine [178]3 years ago

5 0

The correct answer to the question is : D) Be moving at a constant velocity.

EXPLANATION:

As per Newton's first laws of motion, every body continues to be at state of rest or of uniform motion in a straight line unless and until it is compelled by some external unbalanced forces acting on it.

Hence, it is the unbalanced force which changes the state of rest or motion of a body. Balanced force is responsible for keeping the body to be either in static equilibrium or in dynamic equilibrium.

As per the options given in the question, the last one is true for an object under balanced forces.

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Answer:

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(b) $t=4.906seconds$

Explanation:

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To find the final velocity we use the kinematic equation

$(v_{f})^{2} =(v_{i})^{2} +2a(y_{f}-y_{i})\\(v_{f})^{2}=(22m/s)^{2}+2(-9.8m/s^{2} ) (-10-0)\\v_{f}=\sqrt{(22m/s)^{2}+2(-9.8m/s^{2} ) (-10-0)} \\v_{f}=26.08m/s$

Part (b)

To find time of rock trip until it touches the ground we will use simple kinematic equation or simple motion equation

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Notice that we substituted vf with negative sign because its direction is downwards

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3 years ago

Which invention was created to help people with hearing problems? the multiplex telegraph the telephone the phonograph the motio

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The phonograph was invented for people with hearing problems. Option D is correct.

<h3>What is a Phonograph?</h3>

It is a device that records sounds or music in the grooves of a plate and plays them.

This was the first invention that can record and play music.

It was invented by Thomas Alva Edison.

This device helps people with hearing problems by allowing them to practice concentrating on a different sound.

Therefore, the phonograph was invented for people with hearing problems.

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