12. Which of the following can be calculated if the length of the effort arm and the length of the resistance arm are given? (Points : 3)the mechanical advantage of a lever can be calculated.
the mechanical advantage of a wheel and axle can be calculated.
the mechanical advantage of a pulley can be calculated.
the mechanical advantage of a wedge can be calculated.

Answers

Answer 1

Answer: The best and most correct answer among the choices provided by your question is the first choice or letter A.

The mechanical advantage of a lever can be calculated if the length of the effort arm and the length of the resistance arm are given.

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

Answer 2

Answer:

Answer:

The mechanical advantage of a lever can be calculated.

Explanation:

If the length of the effort arm and the length of the resistance arm are given we can calculated the mechanical advantage of a lever. It is also defined as the ratio of output force to the input force. Mathematically, it is given by :

$MA=(F_o)/(F_i)$

Where

$F_o$ is the output force

$F_i$ is the input force

A lever is a simple machine in which there is a Plank that is free to free to rotate around a pivot. So, the correct option is (a) "the mechanical advantage of a lever can be calculated".

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A material that can be represented by a chemical formula is a ___

Electtromagneticradiation

Answers

Electromagnetic Radiation behaves something like a wave and sometimes like a stream of particles.

Th definition is the energy released by an electromagnetic process.

________ is the tendency of an object to vibrate at its natural frequency.a. Polarization
b. Refraction
c. Resonance
d. Diffraction

Answers

Resonance is the answer. Resonance frequency is the term used when an object begins to vibrate at an perferred frequency.

Irregular galaxies are very large. True or False?

Answers

Answer:

False , irregular galaxies are not large galaxy.

Explanation:

False , irregular galaxies are not large galaxy.

There is no specific shape of irregular galaxies. They are one of the tiniest galaxies, filled with gas and dust. Having lots of dust and gas means there's a lot of star formation heading at these galaxies. This process can make them very clear. some examples of these type of galaxies are the Major and minor Magellanic Clouds.

it's false i hope this helps :)

A bus is traveling at 79.7 kilometers per hour east. How far does the bus travel in 1.45 hours?

Answers

Answer:

115.565 km

Explanation:

We know

A bus is traveling at 79.7 kilometers per hour east.

How far does the bus travel in 1.45 hours?

We will solve it by using the Distance formula.

Distance = Speed × Time

We take

79.7 x 1.45 = 115.565 km

So, the bus travels 115.565 km in 1.45 hours.

When driving downhill, your vehicle will accelerate and start moving fast, due to _______________.a. kinetic energy
b. gravity
c. the amount of pressure you put on the accelerator pedal
d. wet pavement

Answers

Correct answer choice is:

B) Gravity

Explanation:

Gravity is a force of attraction that endures within any two bodies, any two groups, any two particles. Gravity is not just the attraction among objects and the Earth. It is because the Earth going around the Sun is in a magnetic stability. The speed of the Earth's action generates a centrifugal force which balances the gravitational force among the Sun and the Earth. Because there is no force to hold it.

B: Gravity.
The force of gravity will pull the car down the hill. The weight/mass of the car also helps this.

Which of these is NOT an event that helped make the Moon as it is today?a. Iron sank into Earth's core.
b. Plate tectonics caused lava to flow.
c. Earth and a planetesimal collided.
d. The lunar surface melted and was bombarded by meteoroids

Answers

The correct answer to the question that is stated above is letter b, Plate tectonics caused lava to flow. All of the options are mentioned in the theories of the formation of the moon except for letter B.

There are 5 serious theories about the formation of the moon,these are:
The Fission Theory--
The Capture Theory--
The Condensation Theory--
The Colliding Planetesimals Theory--
The Ejected Ring Theory--

See attached file for the description of each theory.

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reflecting, spherical Christmas tree ornament has a diameter of 9.0 cm. A child looks at the ornament from a distance of 12 cm. Describe the image she sees.