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2 years ago

Which two objects have stored energy?

Physics

2 answers:

Oxana [17]2 years ago

8 0

A small rock sitting on a big rock and a stretched rubber band both have stored energy

Furkat [3]2 years ago

6 0

3) a stretched rubber band

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A man is standing on a platform that is connected to a pulley arrangement, as the drawing shows. By pulling upward on the rope w

leonid [27]

Answer:

The pulling force that the man should apply to create an upward acceleration of $1.20m/s^{2}$ is $P=621.5N$

Explanation:

As it shows in the drawing at the end, we have that the total mass of the man plus the platform is $113 kg$ , then the force downward $W$ is $W=mg=113Kg*9.8m/s^{2}=1107.4N$ .

Due the man needs to do a pulling force upward capable of lifting himself and the platform with an acceleration of $1.20m/s^{2}$ , this force should create an acceleration greater than gravity by $1.20m/s^{2}$ . then $a_{up}=g+1.2m/s^{2}=9.8m/s^{2}+1.2m/s^{2}=11m/s^{2}$ . Therefore the force should be $P_{up}=ma_{up}=113kg*11m/s^{2}=1243N$ .

Finally, as we have a pulley arrangement connected to the platform, it gives the man a mechanical advantage, so he has to do only half of that upward force

, therefore $P=\frac{1243N}{2}=621.5N$ .

8 0

2 years ago

An escalator carries you from one level to the next in an airport terminal. The upper level is 4.4m above the lower level, and t

horrorfan [7]

Answer:

Part a)

$W = 2716.5 J$

Part B)

$W = -2716.5 J$

Explanation:

Part A)

While escalator is moving up work done to move the person upwards is given as

$W = mgh$

here we know that

m = 63 kg

h = 4.4 m

now we have

$W = 63 \times 9.8 \times 4.4$

$W = 2716.5 J$

Part B)

Work done while we move from up to down

So we have

$W = - mgh$

so we have

$W = -2716.5 J$

6 0

2 years ago

Helen can write 15 postcards in one hour, while Kate can write

Akimi4 [234]

Answer:5 hours

Explanation:

300 divided by 20 = 15

300 divided by 15 = 20

the difference is 5

4 0

1 year ago

Derive the formula 2as=v² -u² where the formula have have usual meanings

attashe74 [19]

Answer:The main formula is v² = u² + 2as

Explanation:

S=½(u +v)t

t = v+u/a

S=½(v-u)(v+u/a)

S=½v²+uv-uv-u²/a

2as=v²-u²

5 0

2 years ago

Joanna learned from customer satisfaction surveys that diners in her restaurant wanted to be able to make substitutions. She has

Dmitry [639]

Answer:

standards

Explanation:

Based on the information provided within the question in regards to the situation at hand it can be said that Joanna is demonstrating a standards gap. this is a gap caused by the difference between the customer service standards a company has created for itself and the expectations the company believes that the customers have for that company. Since Joanna did not tell all the servers of the customers expectations then the ones who do not know will not be able to provide this service to those customers, thus the restaurant will not be able to meet it's customer service standards.

3 0

2 years ago