PLEASE SOMEONE HELP ME PLEASEThere is a bell at the top of a tower that is 20 m high. The bell weighs 100 kg. The bell has potential energy. Calculate it.

Answers

Answer 1

Answer: pe = m • g • h
= 100 • 9.8 • 20
= 19,600 or 1.96 x 10^4

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Can u help me on this question plz

Answers

Ah hah ! The two questions on this page are checking to see
if you understand what "net force" means.

Remember that "net force" means the result of adding up the
strength and direction of a group of separate forces.

Also remember that if the net force is not zero, then the object
accelerates in the direction of the net force.

-- Forces 'B' and 'D' both act horizontally on the airplane.
Force-'D' tries to pull it forward, and force-'B' tries to pull it
backward. The airplane is moving forward faster and faster.
This tells us that the net horizontal force on it must point forward.
So force-D must be stronger than force-B.

-- Forces 'A' and 'C' both act vertically on the airplane.
Force-A tries to pull it up, and force-C tries to pull it down.
At the moment of take-off, the airplane lifts off from the ground
and rises up and up. This tells us that the net vertical force on it
must point up. So force-A must be stronger than force-C.

I can't really see the answer, try underlining it or go over it in pen

TRUE OR FALSE: ancient swamp plants slowly decayed and turned into peat, the first step in making coal.

Answers

Answer:

True

Explanation:

In the first step of coal making all the plant species and trees which start decaying, gets buried under the earth crust and lead to the formation of peat. The peat is further acted upon by the heat and pressure thereby leading to the formation of lignite coal (soft brown coal), which further turns into bituminous coal (black and brittle) and then get converted into anthracite (highest carbon content and is found at greatest depth)

not so fast! you are right the first step is that the plants and animals have to decay then they turn to peat and then in a million years time you have coal !!!!!!! :)

Bruce (the dog) is pulling on his lead with a force of 40N at an angle of 26º below the horizontal. Show that the horizontal component of this force is about 36N.Help???

Answers

Answer:

The horizontal component of this force is about 36 N.

Explanation:

Given that,

Bruce is is pulling on his lead with a force of 40 N

Angle below horizontal, $\theta=26^(\circ)$

We need to find the horizontal component of this force. The horizontal component of any vector is given by :

$F_x=F\ \cos\theta$

$F_x=40* \ \cos(26)$

$F_x=35.95\ N$

$F_x=36\ N$

So, the horizontal component of this force is about 36 N. Hence, this is the required solution.

you will use the equation for work which is w= F times distance so you will take 40N times 36N which equals 1440N

Describe the role of the grass in the food web

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Grass is a producer. It gets its energy from the sun, which i might add is by a process called,"photosynthesis", meaning the grass makes its own food. With this bew energy an animal such as a rabbit comes to eat it, that energy that the grass collected is now the rabbits.

Which of these is NOT an example of work? A. Holding a heavy book
B. Pushing a wheelbarrow
C. Lifting weights

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The correct answer is A. Holding a heavy book.

In this case, there is not a displacement of the system and you must remember that work is force times displacement.

the correct answer is actually A

when an incandescent light bulb is turned on, its thin wire filament heats up quickly. as the temperature of this wire filament increases, its electrical resistance...

Answers

Well, we usually assume that the resistance of a circuit component
is constant and doesn't change. But the truth is that for anything
that conducts current, its resistance always increases somewhat
when it warms up.

For things like light bulbs, electric toasters, space heaters, electric
stove burners, the heat coils in a blow-dryer ... anything that's
designed to be really hot when it's doing its job ... the resistance
of those things increases significantly when they come up to their
operating temperatures.

Hello user!

here is it answer.....

Because the lamp filament is physically very small and dissipates a relatively large amount of power (say, 60W for a typical incandescent bulb), while the conductors which feed it are relatively large and of negligible resistance, so they dissipate very little power, for a relatively large conductor area. How hot a component gets from resistive heating is proportional to its power dissipation, and inversely proportional to its area/size.

Thus if you dissipate, say 60W of power in a tiny lamp filament, it will get hot enough to become (surprise !!) incandescent, while the conductors which supply it (which dissipate perhaps a fraction of a watt for many feet of conductor length) will experience no significant temperature rise.

In fact, applicable electrical codes mandate that circuit conductors be sized large enough and provided with appropriate overcurrent protection, so that no significant conductor heating can take place.

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