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3 years ago

If an object has 100 J of PE, how much work can it do (with that PE)?

Physics

1 answer:

Stella [2.4K]3 years ago

4 0

Answer:

W = 100 J

Explanation:

The potential energy of an object is given by :

$P=mgh$

It is said to possessed by an object due to its position under the action of gravity.

The work done by an object is given by :

W = F×d , F is force and d is displacement

We know that, F = mg

So, if an object has 100 J of PE, it means that it can do the work of 100 J.

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A lightweight string is wrapped several times around the rim of a small hoop. If the free end of the string is held in place and

MariettaO [177]

Answer:

Explanation:

Let T be the tension

For linear motion of hoop downwards

mg -T = ma , m is mass of the hoop . a is linear acceleration of CG of hoop .

For rotational motion of hoop

Torque by tension

T x R , R is radius of hoop.

Angular acceleration be α,

Linear acceleration a = α R

So TR = I α

= I a / R

a = TR² / I

Putting this value in earlier relation

mg -T = m TR² / I

mg = T ( 1 + m R² / I )

T = mg / ( 1 + m R² / I )

mg / ( 1 + R² / k² )

Tension is less than mg or weight because denominator of the expression is more than 1.

5 0

3 years ago

The largest building in the world by volume is the boeing 747 plant in Everett, Washington. It measures approximately 632 m long

Schach [20]

Explanation:

Given that,

The dimensions of the largest building in the world is 632 m long, 710 yards wide, and 112 ft high. It basically forms a cuboid. The volume of a cuboidal shape is given by :

Since,

1 meter = 3.28084 feet

632 m = 2073.49 feet

1 yard= 3 feet

710 yards = 2130 feet

V = lbh

$V=2073.49 \ ft\times 2130\ ft\times 112\ ft$

$V=494651774.4\ ft^3$

$V=4.94\times 10^8\ ft^3$

Also,

$V=(4.94\times 10^8\ ft^3)(\dfrac{1\ m}{3.281})^3$

$V=1.39\times 10^7\ m^3$

Hence, this is the required solution.

3 0

4 years ago

What formula do I use for the second question? For number 3 how is one energy converted to the other? ( using arrows ) I get num

Fed [463]

#2
Use the formula ... Kinetic energy = (1/2) x (mass) x (speed)²

#3 - a).
sun => energy travels as electromagnetic waves => reaches Earth as
 heat & light energy.

sun => absorbed in plants => eaten by animals => animals die =>
 decay into oil in millions of years => we burn the oil to get the energy.

#3 - b).
food I ate for lunch => metabolized into glucose by my body
 => some of it burned in my muscles to generate energy for immediate needs
 => the rest of it stored as fat for future needs.

#3 - c).
flower pot rolls off the ledge => gravity does work on it all the way down,
 producing the kinetic energy it has when it hits the floor.

#3 - d).
oil or natural gas is burned, releasing heat energy => energy is used
 to generate electricity => electricity flows through cables from the
 power generating plant to your home => hot plate plugged into the
 wall => turns electrical energy back into heat energy => heat energy
 is conducted into the bottom of the beaker, flows through the glass
 to the inside surface => heat energy is conducted from the inside of
 the glass to the water, which gets hotter as it absorbs more energy.
=============================

Note:
#1 on the sheet is wrong.
"Work = force x distance" that's correct
But 25-kg is the mass of the ball, not the gravitational force on it.
The force on it is (mass) x (gravity), called its "weight".
 That's (25-kg) x (9.8 m/s²) = 245 kg-m/s² = 245 newtons .

6 0

3 years ago

A yellow ball with a mass of 2 kg is rolling across the floor at 3 m/s. A red ball with a mass of 3 kg is rolling across the sam

Amiraneli [1.4K]

Answer:B The red ball has greater kinetic energy because it has greater mass

Explanation:

3 0

3 years ago

Read 2 more answers

observational studies are identified by changes in sot variable while controlling other true or false

ikadub [295]

This statement would be false.

3 0

3 years ago