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Lisa [10]
3 years ago
9

Would you be doing more work by going up the stairs twice as fast?

Physics
2 answers:
True [87]3 years ago
5 0
Yes you would be doing more work

Lady bird [3.3K]3 years ago
5 0
I would think that you would be using more force on your muscles to make your self go up the stairs quicker. the is the difference between a casual walk and full on running
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A girl pushes on a table with a 5-newton force directed to the east. Her friend pushes on the same table with a 10- newton force
nalin [4]

Think like this: 10 is twice as much as 5.

Answer A pushes 2 squares east and 4 squares sout, being doubled just as 10 is to 5. Happy to help :)

4 0
3 years ago
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A roundabout is a type of playground equipment involving a large flat metal disk that is able to spin about its center axis. A r
Zina [86]

Answer:

116.1 kgm²/s

1.12718 rad/s

Decreases

Explanation:

m = Mass of girl = 43 kg

M = Mass of roundabout = 120 kg

v = Velocity of roundabout = 2.7 m/s

r = Radius of roundabout = 1 m = R

I = Moment of inertia

Her angular momentum

L_i=mvr\\\Rightarrow L_i=43\times 2.7\times 1\\\Rightarrow L_i=116.1\ kgm^2/s

Magnitude of angular momentum is 116.1 kgm²/s

Here the angular momentum is conserved

L_f=L_i\\\Rightarrow I\omega=L_i\\\Rightarrow (\frac{1}{2}MR^2+mr^2)\omega=116.1\\\Rightarrow \omega=\frac{116.1}{\frac{1}{2}\times 120\times 1^2+43\times 1^2}\\\Rightarrow \omega=1.12718\ rad/s

Angular speed of the roundabout is 1.12718 rad/s

Initial kinetic energy

K_i=\frac{1}{2}mv^2\\\Rightarrow K_i=\frac{1}{2}43\times 2.7^2\\\Rightarrow K_i=156.735\ J

Final kinetic energy

K_f=\frac{1}{2}I\omega^2\\\Rightarrow K_f=\frac{1}{2}\times (\frac{1}{2}\times 120\times 1^2+43\times 1^2)\times 1.12718^2\\\Rightarrow K_f=65.43253\ J

The overall kinetic energy decreases as can be seen. This loss is converted to heat.

5 0
3 years ago
PLEASE HELP CORRECT ANSWER GETS BRAINLIEST!! Describe how the Doppler effect supports the big bang theory
tester [92]
The Doppler effect determined and supported that the universe was expanding by measuring the Doppler effect in the light emitted from galaxies.
Hope this helps!
8 0
3 years ago
If Sarah melts 10g of tin. What mass of melted tin would she have at the end of the experiment?​
Nastasia [14]

Answer:

10g

Explanation:

As the Law of Conservation of Mass states that " Mass can neither be created nor be destroyed in a chemical reaction".

Though melting of tin isn't a chemical change, the same logic is applied here...

Hence,

The mass of tin will be 10 g itself...

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4 years ago
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In which of the following cases would you feel weightless?
Dafna11 [192]
Falling from an airplane.
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