A force of 20 N is executed to raise a rock weighing 30 N. What is the actual mechanical advantage?

Answers

Answer 1
Answer: i am absolutely sure its 1.5
Answer 2
Answer:

1.5, because I said so.


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Usain bolt can run the 100 m dash in 9.58 s. what is usain's average acceleration during this sprint?
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How do the speeds v0, v1, and v2 (at times t0, t1, and t2) compare?a: v0 = v1 = v2 > 0b: v0 = v2 > v1 = 0c: v0 = v2 > v1 > 0d: v0 > v1 > v2 > 0e: v0 > v2 > v1 = 0
What is the product of nuclear fission?a. two different atoms that are isotopes of the original atom b. two different atoms that are both less massive than the original atom c. two different atoms that have larger electron clouds than the original atom d. two different atoms that have the same number of neutrons as the original atom User: What is released when the nuclei of two smaller atoms fuse to form a larger atom? a. energy b. compound c. mass d. matter

What evidence did Alfred Wegener use to support his theory of continental drift?

Answers

Explanation:

Alfred Wegener was a meteorologist and geologist. He was inspired by a map of continents to start the journey of explaining Earth's geological history. He gave the theory of continental drift which says that the continents of Earth have moved relative to each other over time. He used following evidences to support his theory:

1. The facing side of South America's and Africa's shoreline interlocks perfectly. Which implies they must have been joined together in history.

2. Fossil of same type of reptiles found on different continents separated by huge oceans.

3. Matching the rock pieces on either side of the Atlantic oceans.

Answer: The correct answer is: coastline fits between different continents, similar rocks and fossils on different continents

Explanation: I took the test

Draw in force and velocity vectors at the four marked positions the object below is moving counterclockwise in uniform circular motion

Answers

This is what it would look like—
Angular velocity = w
Linear velocity = v
Centripetal acceleration = ac

How is the frequency of an electromagnetic wave related to energy?A) As the frequency of the wave decreases, its energy increases.
B) As the frequency of the wave fluctuates, its energy decreases.
C) As the frequency of the wave increases, its energy also increases.
D) As the frequency of the wave changes, its energy remains constant.

Answers

As the frequency of the wave increases, its energy also increases. The correct option is C.

The frequency of an electromagnetic wave is defined as the number of oscillations or cycles per unit of time.

The frequency of the wave, on the other hand, is directly proportional to energy.

The energy of an electromagneticwave is precisely proportional to its frequency, according to the equation E = hf, where E represents energy, h is Planck's constant, and f is the frequency of the wave.

Simply said, higher frequency waves have more energy than lower frequency waves.

This is true over the whole electromagneticspectrum, from radio waves to gamma rays. The energy carried by the wave rises as the frequency of the wave increases.

Thus, the correct option is C.

For more details regarding electromagnetic spectrum, visit:

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c) As the frequency of the wave increases, its energy also increases!

A machine uses a force of 200 newtons to do 20,000 joules of work in 20 seconds. Find the distance the object moved and the power of the machine.

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work=force * distance
20,000 joules= 200 newtons * d 
divide both sides by 200

100= distance

What ion is most closely associated with bases?

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Answer: hydroxyl ion

Explanation:

When base is dissolved in water it dissociate and produce an hydroxyl ion

The ion most closely associated is hydroxide.

Magnitude and Direction of Electric Fields??How would you do the following? A small object A, electrically charged, creates an electric field. At a point P located 0.250m directly north of A, the field has a value of 40.0N/C directed to the south. What is the charge of object A? (a)1.11×10^-9 C (b)-1.11x10^-9 C (c)2.78x10^-10 C (d)-2.78x10^-10 C (e)5.75x10^12 C (f)-5.75x10^12 C

Answers

The right answer for the question that is being asked and shown above is that: "(d)-2.78x10^-10 C."  A small object A, electrically charged, creates an electric field. At a point P located 0.250m directly north of A, the field has a value of 40.0N/C directed to the south.