I need help please! It's for a class I'm failing!You exert 375 J to move a 45-kg object 5 m. How much force is required?
a. 1,875N
b. 75N
c. 420N
d. 225N

Answers

Answer 1

Answer:
Here's the formula you need to remember:

Work = (force) x (distance)

That's it. It's so short and simple that you didn't pay much attention
to it when it came around the first time. I KNOW it's in your notes,
maybe several pages back. Now, you should memorize it, before
it gets away from you again.

Work = (force) x (distance).

Say it with me: "Werk eekwals forss timez distanss".

Now that you have that tool in your toolbox, we can go on
and look at the question.

This question is not easy, and when I read it carefully, I DON't
think that's because there's a lot of Physics hidden in it. I think
it's because whoever wrote the question was unclear on some
of the concepts, and wrote a poor question.

The question DOESN't tell you what direction I moved the 45-kg
object. Did I slide it across the floor, or did I lift it straight up ?

Now I'm thinking about it some more, and I changed my mind.
NOW I think the question was written by a person who made it
very sneaky, to see if we know what we're doing.

Close your eyes and tell me the formula for work that we just
memorized. . . . . . Very Good ! Work = (force) times (distance).

From the question, we know the work, and we know the distance.

375 J = (force) x (5 meters)

Divide each side by (5 meters): (375 J) / (5 meters) = Force

Force = 75 newtons .

That bit about "45 kg" is just there to confuse us. We don't care
WHAT the mass of the object is. We don't need it to answer the
question, and we don't need to know it. I almost got sucked in,
and I was trying to take you down with me.

All we need to know is: Work = (force) times (distance) .

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Which device is using a motor?A water heater creates heat energy from electric energy.

A waterfall rotates a waterwheel to turn an axle.

A body massager uses electric energy to move back and forth.

A solar charger creates electric energy from the Sun.

Answers

Out of all the options, only body massager which uses electric energy to move back and forth is using motor here. It is because a motor converts electrical energy to Mechanical energy and only massager obeys it among all the options.

In short, Your Answer would be Option C

Hope this helps!

Answer: C.

A body massager uses electric energy to move back and forth.

Explanation:

a. Define Valency. b. Write the symbol and valency of the following : (i) Oxygen (ii) potassium 7. a. Magnesium burns in Oxygen to form Magnesium Oxide. a) Name the reactants b) Name the Products c) Write the word equation for the above reaction.

Answers

⚘ YourAnswers:

A) Valency is the combining capacity of any element. Valence electrons refers to the electrons found in the outermost shell of the atom of the element.

B) Symbol and valency:

Oxygen(O) = (At. no. 8) = -2(Valency)
Potassium(K) = (At. no. = 19) = +1(Valency)

C) The reaction would be:

$\large{ \boxed{ \rm{2Mg + O_2 \longrightarrow \: 2MgO}}}$

Reactants = Magnesium and Oxygen
Products = Magnesium oxide
Word equation:

$\large{ \boxed{ \rm{Magnesium + Oxygen \longrightarrow Magnesium oxide.</p><p>}}}$

━━━━━━━━━━━━━━━━━━━━

Answer:

Oxygen-Symbol-O Potassium Symbol-K

A bus accelerates 25 m/s" and the bus has a mass of 150kg. What is the force on the bus?

Answers

Answer:

150 I would believe that it is the correct answer

A child is given an initial push on a rope swing. On the first swing, the rope swings through an arc of 12 feet. On each successive swing, the length of the arc is 80% of the previous length. After 14 swings, what total length will the rope have swung? When the child stops swinging, what total length will the rope have swung?

Answers

Answer:

After 14 swings, total length = 57.35 feet.

When the child stops swinging, Total length = 60 feet.

Explanation:

The total length of the rope after 14 swings form a geometric progression which is also known as exponential sequence.

The sum of the term in a Geometry progression is

Sₙ = a(1-rⁿ)/1-r.................(1)

Where Sₙ = sum of the nth term, a= first term, n= number of term, r= common ratio.

n=14, a= 12 feet, r=80% = 0.8.

Substituting the values above into equation(1)

S₁₄ = 12(1-0.8¹⁴)/1-0.8

S₁₄= 12(1-0.04398)/1-0.8

S₁₄= 12(0.95602)/0.2

S₁₄ = 11.47/0.2

S₁₄= 57.35 feet

∴ After 14 swings, the total length the rope will swing is = 57.35 feet.

The total length of the rope when the child stop swinging = sum to infinity of the Geometry progression( exponential sequence).

The sum to infinity of an exponential sequence

S = a/1-r

Where a= first term= 12 feet, r= common ratio = 0.8.

∴ S= 12/1-0.8

S= 12/0.2

S = 60 feet

When the boy stops swinging, the total length the rope have swung = 60 feet.

What is the acceleration of a ball traveling horizontally with an initial velocity of 20 meters/second and, 2.0 seconds later, a velocity of 30 meters/second?

Answers

v o = 20 m / s ( initial velocity )
t = 2.0 s
v = 30 m / s
a - acceleration:
v = v o + a t
a t = v - v 0
a = ( v - v o ) / t
a = ( 30 m/s - 20 m/s ) / 2 s = 10 m / s : 2 s = 5 m/s²

Why is a raindrop a particularly damaging element to soil

Answers

Answer:

Raindrops are considered damaging to the soil in the following ways:

If it is too wet or too dry, nutrients in the soil can run off and not make it to the plants' roots, leading to poor growth and overall health.
over-watering or too much rain can also lead to bacteria, fungus, and mold growth in the soil
If the average rainfall is much lower or higher than the ideal, it can lead to significant problems, from drowned crops to lower yields.
The soil can also start to collect bacteria, mold, and fungus, which can then be absorbed by the plant. While this isn’t as common in crops as it is in indoor plants, poor drainage and irrigation systems can lead to these types of growths taking control over your crops.
raindrops when it is excessive can lead to erosion and leaching of the soil
soil loss is mostly affected by increasing runoff discharge of rainwater

Cheers!

Rain drop causes Erosion

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