Sketch of the distance vs time graph for a car with constant velocity

Please in the name of god help me guys.

zepelin [54]

1. D: the ability to cause a change or do work

The others dont make sense for energy.

2. C: Lamp

A lamp uses the electric current to light up a room, or area.

3. B: foil will bend away

The same charges repel each other that is why a magnet is repelled by the same pole of another magnet.

4. A: Sound

You can’t hear light or any of the other options.

5. A: gravity

Gravity is a force of nature that pulls on everything.

6. C: static electricity

The opposite charges stick to each other, a battery again is an example of this.

7. B: a copper nail

Metal is one of the best electric conductors.

8. C: closed circuit

This is because if a circuit is closed the electricity flows through perfectly but for example an open one would not work or it would leak energy.

Hope this helps

3 0

3 years ago

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Positional and non positional different between

Sergeeva-Olga [200]

Explanation:

In positional number system,

1. each symbol represents different value depending on the position they occupy in a number.

2. In positional number system, each system has a value that relates to the number directly next to it. The total value of a positional number is the total of the resultant value of all positions.

3. Example: 12 can be 1 x 10 + 2 x 1, 10 + 2= 12

whereas in Non-Positional number

1. In non-positional number system, each symbol represents the same value regardless of its position

2. In non-positional number system each symbol represents a number with its own place value.

3. Example: Roman number system where I for 1, II for 2 etc.

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6 0

3 years ago

A 80kg astronaut is training in human centrifuge to prepare for a launch. The astronaut uses the centrifuge to practice having a

inessss [21]

The answers on the model of the human centrifuge ready for the launch to each question of the statement are listed below:

a) A force of 2479.210 newtons is acting on the astronaut's back.

b) A <em>net centripetal</em> force of 2479.210 newtons is acting on the astronaut.

c) The <em>centripetal</em> acceleration of the astronaut is 30.990 meters per square second.

d) The astronaut has a <em>linear</em> speed of approximately 19.284 meters per second.

e) The <em>angular</em> speed of the astronaut is 1.607 radians per second (15.346 revolutions per minute).

<h3>How to apply Newton's laws to analyze a process in a human centrifuge training</h3>

The human centrifuge experiments a <em>centripetal</em> acceleration when it reaches a <em>peak</em> angular speed. In this question we must apply Newton's laws of motion and concepts of <em>centripete</em> and <em>centrifugal</em> forces to answer the questions. Now we proceed to answer the questions:

<h3>How much force is acting on the astronaut's back?</h3>

By the third Newton's law the astronaut experiments a <em>rection</em> force (<em>F</em>), in newtons, which has the same magnitude to <em>centrifugal</em> force but opposed to that force. The magnitude of the force acting on the back of the astronaut is equal to:

$F = 3.16\cdot (80\,kg)\cdot \left(9.807\,\frac{m}{s^{2}} \right)$

$F = 2479.210\,N$

A force of 2479.210 newtons is acting on the astronaut's back. $\blacksquare$

<h3>What is the net centripetal force on the astronaut?</h3>

By the second and third Newton's laws we know that the <em>net centripetal</em> force on the astronaut is equal to the magnitude of the force found in the previous question. Thus, a <em>net centripetal</em> force of 2479.210 newtons is acting on the astronaut. $\blacksquare$

<h3>What is the astronaut's centripetal acceleration?</h3>

The centripetal acceleration of the astronaut (<em>a</em>), in meters per square second, is found by dividing the result of the previous question by the mass of the astronaut (<em>m</em>), in kilograms:

$a = \frac{F}{m}$ (1)

If we know that F = 2479.210 newtons and m = 80 kilograms, then the centripetal acceleration of the astronaut is:

$a = \frac{2479.210\,N}{80\,kg}$

$a = 30.990\,\frac{m}{s^{2}}$

The <em>centripetal</em> acceleration of the astronaut is 30.990 meters per square second. $\blacksquare$

<h3>What is the astronaut's linear speed?</h3>

By definition of <em>uniform circular</em> motion, we have the following formula for the <em>linear</em> velocity of the astronaut (<em>v</em>):

$v = \sqrt{a\cdot r}$ (1)

Where <em>r</em> is the radius of the human centrifuge, in meters.

If we know that $a = 30.990\,\frac{m}{s^{2}}$ and $r = 12\,m$ , then linear velocity of the astronaut is:

$v = \sqrt{\left(30.990\,\frac{m}{s^{2}} \right)\cdot (12\,m)}$

The astronaut has a <em>linear</em> speed of approximately 19.284 meters per second. $\blacksquare$

<h3>What is the astronaut's angular speed? </h3>

The <em>angular</em> speed of the astronaut (ω), in radians per second, is found by the following <em>kinematic</em> relationship:

$\omega = \frac{v}{R}$ (1)

If we know that <em>v ≈ 19.284 m/s</em> and <em>R = 12 m</em>, then the angular speed is:

$\omega = \frac{19.284\,\frac{m}{s} }{12\,m}$

The <em>angular</em> speed of the astronaut is 1.607 radians per second (15.346 revolutions per minute). $\blacksquare$

To learn more on centripetal forces, we kindly invite to check this verified question: brainly.com/question/11324711

6 0

2 years ago

What effects are jets and magnetic fields thought to have on a protostar?

alexgriva [62]

Answer:

the effects that a jet and the magnetic fields have on a ProStar Is :

Explanation:

over the years scientist have found out that magnetic fields and the Jets carry away angular momentum , which helps the ProStar grow more in size .

7 0

3 years ago

The apartment’s explosion, reportedly caused by a gas leak, produced a violent release of gas and heat. The heat increased the _

BabaBlast [244]

Increased the temperature in the room, which means an increase in the airs connect molecular energy

7 0

3 years ago

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