3 years ago

What is the reaction force to a foot pushing down on the floor?

Physics

2 answers:

ser-zykov [4K]3 years ago

6 0

C. Every action is an equal reaction when we’re talking about force

Helga [31]3 years ago

5 0

Answer:

C. The floor pushing back against the foot

Explanation:

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Which resource would be the best choice to learn more information about studying martial arts?

zhuklara [117]

Answer:

Dance studio

Explanation:

Martial art use to defend ourself from any dangerous. Dance is a way to learn it

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3 years ago

A wheel with moment of inertia 25 kg. m2 and angular velocity 10 rad/s begins to speed up, with angular acceleration 15 rad/sec2

Pani-rosa [81]

Answer:

(A) Angular speed 40 rad/sec

Rotation = 50 rad

(b) 37812.5 J

Explanation:

We have given moment of inertia of the wheel $I=25kgm^2$

Initial angular velocity of the wheel $\omega _0=10rad/sec$

Angular acceleration $\alpha =15rad/sec^2$

(a) We know that $\omega =\omega _0+\alpha t$

We have given t = 2 sec

So $\omega =10+15\times 2=40rad/sec$

Now $\Theta =\omega _0t+\frac{1}{2}\alpha t^2=10\times 2+\frac{1}{2}\times 15\times 2^2=50rad$

(b) After 3 sec $\omega =10+15\times 3=55rad/sec$

We know that kinetic energy is given by $Ke=\frac{1}{2}I\omega ^2=\frac{1}{2}\times 25\times 55^2=37812.5J$

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3 years ago

4. State in words how acceleration is calculated.

dimaraw [331]

You multiply force times friction

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3 years ago

Which projectiles will be visibly affected by air resistance when they fall?

NemiM [27]

Any object that is launched as a projectile will lose speed and, as a result, altitude, as it travels through the air. The rate at which the object loses speed and altitude depends on the amount of force that way applied to it when it was launched. It is also dependent on the size and shape of the item. This is why something like, say, a football is much faster to fall to the ground than a bullet.

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3 years ago

How can you prove to other people that your theory should become a law?

elena-s [515]

By giving them an advice and by giving them encouraging and explaining the any theory

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2 years ago