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3 years ago

Confused..................

Physics

1 answer:

svlad2 [7]3 years ago

3 0

1. Dump the container out.
2. Sift the large items out until the sugar and gravel is by itself.
3. Continue separating the other items.

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A ball moves along a table at a constant velocity and then rolls off the edge of the table. The forces that should be included i

Len [333]

Answer:

Gravity

Explanation:

When the ball is falling to the ground, it is already detached from the table, so the table does not exert any force on it.

Gravity is always present, therefore it is acting on the ball (acting downward), so it must be included into the free-body diagram. Apart from that, there are no other forces acting on the ball (if we neglect air resistance, which is negligible, and it is not mentioned in the options given), therefore the only force which has to be included in the diagram is gravity.

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3 years ago

Constant power P is delivered to a car of mass m by its engine. Show that if air resistance can be ignored, the distance covered

olga2289 [7]

Answer:

Check Explanation.

Explanation:

At rest, the car had zero kinetic energy, that is K(rest) = 0. The kinetic energy of the car when the car moved, k(moved) can be calculated by using the work- energy relationship that is;

Work, W= k(moved) - k(rest).

k(moved) = work, W + k(rest).

[Recall that k(rest) = 0]. Therefore, k(moved) = work, W.

{Two Important equations to note are (1). Work, W=( 1/2) mass,m × (speed, V)^2 and (2). Power, P = work,W/ time,t}.

Hence, k(moved) = ( 1/2) mass,m × (speed, V)^2 ---------------------------(1).

Since, power, P= W/t -----------------(2).

Then, equation (2) becomes;

Power, P = m × v^2/ 2 × t.

Making, speed, v the subject of the formula, we have;

v = [(2 × P × t)/ m]^ 1/2. ---------------(3).

Another thing we have to remember is the formula for speed which is the change in distance with time that is; ds/ dt.

Therefore, ds/ dt = [(2 × P × t)/ m]^ 1/2.

ds/dt = [(2 × P)/ m]^ 1/2 × t^ 1/2 ------(4).

Then, the integration of the equation (4) above will give us;

s = ( 8P 9m )^ 1/2 × t^ 3/2 .

(Check attachment for more).

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4 years ago

Read 2 more answers

Give an example when forces are balanced in Jenga

mariarad [96]

It has something to do with inertia and "center of mass"

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3 years ago

Both independent and dependent clauses

seropon [69]

Answer:

Independent clause: A group of words that can stand alone as a sentence. It has both a subject and a verb and forms a complete thought.

Dependent clause: A clause that provides a sentence element with additional information, but which cannot stand as a sentence.

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4 years ago

Read 2 more answers

Astronauts increased in height by an average of approximately 40 mm (about an inch and a half) during the Apollo-Soyuz missions,

swat32

Answer:

<em>Yes. Something similar occurs here on Earth.</em>

Explanation:

Gravity tends to pull objects perpendicularly to the ground. In space, the absence of this force means there is no compression on the spine due to gravity trying to pull it down. This means that astronauts undergo an increase in height in space.

Here on Earth, we experience gravity pull on our spine during the day. At night when we sleep, we lie down with our spine parallel to the ground, which means that our spine is no longer under compression from gravity force. The result is that we are a few centimetres taller in the morning when we wake up, than we are before going to bed at night. The increase is not much pronounced here on Earth because there is a repeated cycle of compression and decompression of our spine due to gravity, unlike when compared to that of astronauts that spend long duration in space, all the while without gravity forces on their spine

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3 years ago