3 years ago

Why are muscles an essential part of the circulatory system?

1 answer:

5 0

The circulatory system carries oxygen, nutrients, and hormones to cells they remove waste products, like carbon dioxide. These roadways travel in one direction only, to keep things going where they should. :)

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A bicycle-cab driver takes two customers across the park. The driver exerts a constant force of 1,400 Newtons as he pedals the c

seraphim [82]

Power is the work performed divided by time in seconds. The work is the force times distance:
$W=Fd=1400*200=280000J$

the time in seconds is 60*11+30=690s so the power is

$P=\frac{280000J }{690s}=405.8W$

So choice B

4 0

3 years ago

Need help ASAP shoving brainlest plsssss

seraphim [82]

The answer for this would be B!!

3 0

3 years ago

When an object is moving on a surface with a lot of texture, how does this affect the amount of friction created?

dexar [7]

Answer:

b) less friction is created

4 0

3 years ago

A 6 kg object falls 10 m. The object is attached mechanically to a paddle-wheel which rotates as the object falls. The paddle-wh

maksim [4K]

Answer: $16.234^{\circ}C$

Explanation:

Given

Mass of object (m)=6 kg

falling height(h)=10 m

mass of water( $m_w$ )=600 gm

temperature of water =15

specific heat of water $=4.186 j/g-^{\circ}C$

Let T be the Final Temperature of water

Here Object Potential Energy is converted into Heat energy which will be absorbed by water

Potential Energy(P.E.) $=mgh=6\times 9.81\times 10=588.6 J$

Heat supplied $=m_wc(\Delta T)$

$H.E.=600\times 4.186\times (T-16)$

$588.6=2511.6\times (T-16)$

T-16=0.234

$T=16.234^{\circ}C$

This is not an efficient way of heating water as there is only $0.234^{\circ}C$ increase in temperature.

5 0

3 years ago

Is a diatom a protist?

spayn [35]

Yes it is, I don't want to give a long explanation but I did a whole project on diatoms for biology last week because we were learning about protists. A protist is something that is unicellular (made up of one cell) and diatoms are unicellular organisms.

3 0

3 years ago

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