Frequency could be measured using which quantity?a. meters
b. seconds
c. waves per second
d. meters per second

Answers

Answer 1

Answer: Frequency is the amount kf waves that pass a certain point jn a given amount of time- so the answer is c

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The large blade of a helicopter is rotating in a horizontal circle. The length of the blade is 6.58 m, measured from its tip to the center of the circle. Find the ratio of the centripetal acceleration at the end of the blade to that which exists at a point located 4.78 m from the center of the circle.

Answers

Answer:1.37

Explanation:

Given

Length of Blade $L=6.58 m$

Let blades be rotating at an angular velocity of $\omega$

centripetal acceleration at any radial distance r is given by

$a_c=\omega ^2\cdot r$

at $r=6.58$

$a_c_1=\omega ^2\cdot 6.58$

at $r=4.78 m$

$a_c_2=\omega ^2\cdot 4.78$

thus $(a_c_2)/(a_c_1)=(\omega ^2\cdot 4.78)/(\omega ^2\cdot 6.58)$

$(a_c_2)/(a_c_1)=0.72$

$(a_c_1)/(a_c_2)=1.37$

Final answer:

Centripetal acceleration depends inversely on the radius. The ratio of the centripetal accelerations at the end of the blade and at 4.78m from the center is approximately 0.73.

Explanation:

The centripetal acceleration of an object moving in a circle of radius r is given by the formula ac = v²/r, where v is the tangential velocity of the object. In this scenario, the velocity at both points on the blade is the same, as the blade is rotating as a whole.

Therefore, the centripetal acceleration on the blade at any point is inversely proportional to the radius from the center of the circle to that point.

So, the ratio of the centripetal acceleration at the end of the blade (6.58 m from the center) to the centripetal acceleration at a point located 4.78 m from the center, is the inverse ratio of their distances from the center. Therefore, the ratio is 4.78/6.58 which approximately equals 0.73.

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When starting a heavy train, why will train engineers sometimes back up, stop, and then proceed forward? (This technique is called "bunching slack.")

Answers

it is kind of in the name. it brings the cars closer together then continues to go forward.

maybe....
when going in reverse it makes a tiny gap between each boxcar, then when going forward it pushes or pulls each car one at a time to build momentum rather than moving them all at once...not sure

You are at the Super Bowl. The coach puts you in during the 4th quarter to be the quarterback to secure your team the win. Since you are fresh off the bench, you are able to throw the ball with more force than the last person. What advantages, using Newton's second law, will this have when playing?

Answers

Answer:

the ball will fly faster, and longer distance, which means there is going to be less air resistnace friction acting upon the ball.

Explanation:

F = ma

Force = mass x acceleration

Mass of football remains constant, fresh arm of QB provides higher acceleration.

Ball will get to receiver faster.

Suppose you built a scale-model atom in which the nucleus is the size of a tennis ball. About how far would the cloud of electrons extend?

Answers

Answer:

500 m

Explanation:

The size of a nucleus is about

$d=10^(-15) m$

Instead, the size of the electron cloud extends at the order of

$D=10^(-10)m$

This means that the ratio between the size of the electron cloud and the size of the nucleus is about

$k=(D)/(d)=10,000$

So, the electron cloud is about 10,000 bigger than the nucleus of the atom.

Here we want to build a scale-model atom, in which the nucleus is the size of a tennis ball, so a size of approximately

$d=5 cm$

Therefore, since the proportions must be respected, the electron clouds must be 10,000 bigger, so its size in this model would be:

$D=kd=(10,000)(5)=50,000 cm = 500 m$

So, the size of the electron cloud would be 500 m.

Final answer:

The cloud of electrons in a scale-model atom would extend about 100 meters.

Explanation:

The nucleus is a central, positively charged region within an atom. It contains protons, which have a positive electric charge, and neutrons, which are electrically neutral. Nuclei make up the majority of an atom's mass and are held together by the strong nuclear force, while electrons orbit the nucleus in electron shells.

In a scale-model atom where the nucleus is the size of a tennis ball, the cloud of electrons would extend about 100 meters. This can be calculated by comparing the size of the nucleus to the actual size of an atom. The diameter of a tennis ball is approximately 6.7 cm, while the diameter of an atom is on the order of 0.1 nm. By scaling up, we find that the electron cloud would extend around 100 meters.

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Which best describes how heat flows? A. Heat flows from a warmer object to a colder object. B. Heat flows in any direction. C. Heat flows from a colder object to a warmer object. D. All objects transfer to their heat to all other objects.

Answers

The statement which best describes how heat flows is that the heat generally flows from a warmer object to a colder object. Therefore, the correct option is A.

The mechanism of heat flow significantly describes the transfer of heat energy or enthalpy from one object to another. It is transferred through the process of conduction, convection, and radiation.

The object that is warmer in appearance may accumulate heat in enough amounts. This leads to an increase in its temperature and energy, While the mechanism of heat transfer generally initiates this warmer object to a colder object by conduction.

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Heat flows from a warmer object to a colder object

The average kinetic energy of the atoms that make up a substance which is changing from a liquid to a solid is _____________.Select one of the options below as your answer:
a. decreasing
b. increasing
c. unchanged

Answers

The average kinetic energy of the atoms that make up a substance which is changing from a liquid to a solid is decreasing. The answer is letter A. This is because there is more room for movement of atoms if the pahse is in liquid than in solid.

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