PHYSICS MIDDLE SCHOOL

A candy bar supplies your muscles with energy. If your muscles are 40% efficient, how much work can they perform if the candy contains 800 J?

Answers

Answer 1

Answer:

Answer:

The muscles can perform 320 J of work.

Explanation:

Let the work performed by the muscles be $W_(out)$ J.

Efficiency of a body is given as the ratio of useful work to that of work supplied.

Here, the work provided by the candy bar is, $W_(in)=800\ J$

Efficiency of the muscles is, $\eta =40\%=0.40$

Now, we know that,

$\textrm{Efficiency,}\ \eta=(W_(out))/(W_(in))\n0.40=(W_(out))/(800)\nW_(out)=0.40* 800=320\ J$

Therefore, the work performed by the muscles is 320 J.

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A 100 N force is applied to move a 15 kg object a horizontal distance of 5 meters at constant speed. * A 15 J B 150 J
C 1500 J
D 15000 J

Answers

Although this question doesn't ask a question, I'm guessing that the
question is probably "How much work is done in moving the object ?"

If my hunch is correct, then the answer is not listed among the choices.

Work = (force) x (distance)

= (100 N) x (5 m) = 500 joules.

Well whaddaya know! Maybe that wasn't the question.

PLEASE HELP ON MORE SCIENCE! :)

Answers

1 is standing wave
2 is Constructive Interference
3 is longitudinal
4 is first choice
5 is first choice

The second one: "Constructive interference" even though the question confused me

Answer fast, please.

Answers

D bomb b j de violence

Calculate the volume of 1280 kilograms of aluminium if the density of aluminium is 2700 kg/m³. Give your answer to 2 decimal places.

Answers

Answer:

The correct answer is 0.47 m³

Explanation:

The formula for density (d) is

Mass (m) ÷ volume (v)

Hence

d = m ÷ v

The density of aluminium (as provided in the question) is 2700 kg/m³ and the mass of aluminium is 1280 kg, the volume is however unknown.

Thus, from the formula earlier

2700 = 1280 ÷ v

v = 1280 ÷ 2700

v = 0.47 m³

The volume of aluminium when the density is 2700 kg/m³ and the mass is 1280 kg is 0.47 m³

Answer:

volume = 0.47 $m^(3)$ .

Explanation:

Density:

$d = (m)/(v)$

We have that d = 2700 kg/ $m^(3)$ and that we have 1280 kg of Al.

$2700 = (1280)/(V)$

V = 0.47 $m^(3)$

Which of the following are adaptions of the digestive system in land-dwelling herbivores?A. Flat teeth and longer intestinal tracts
B. More fat cells to store energy
C. Strong jaws and sharper teeth
D. Removal of ammonia through gills

Answers

Answer: A

Land dwelling herbivores have flatter teeth, to help with chewing plants (as opposed to canines to rip through flesh). They also have a longer intestinal track, this is because plants don't putrefy in the body as quickly as raw meat will, so a longer intestinal track doesn't hurt herbivores.

Answer: A

Select the correct answer.Rita is about to buy a house. She looks at houses in a good neighborhood that’s well known for its excellent community policing.. What need is she trying to fulfill according to Maslow’s hierarchy of needs?
A.
self-actualization
B.
esteem
C.
safety
D.
physiological

Answers

the answer would be c because it is talking about she wants to be in a good neighborhood

I would say c, if she is looking in a good neighborhood with good policing, then she wants to be safe.

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