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2 years ago

Why does a gymnast rub powder on his hands before exercising on a set of parallel bars? (I need a scientific answer)

Physics

2 answers:

Gemiola [76]2 years ago

6 0

So he doesnt slip. Gives himself a good grip. The powder and the bar have friction. More friction = better grip

dlinn [17]2 years ago

4 0

Answer

To increase friction for a better grip.

Answer

Most human beings do sweat hands especially on the palm. When this happens the person will not have a good grip of heavy objects because they will slide/slip from the hand.

By applying the powder, you are trying to make the hand dry hence increasing the friction for a better grip.

If the gymnast doesn't do this the parallel bars may slip from the hands and injure himself or herself.

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2 years ago

A constant net torque is applied to an object. Which one of the following will NOT be constant?

love history [14]

Answer:

B) Angular velocity

Explanation:

The equivalent of Newton's second law for the rotational motions can be written as:

$\tau = I \alpha$

where

$\tau$ is the net torque applied to the object

I is the moment of inertia

$\alpha$ is the angular acceleration

From the formula we see that when a constant net torque $\tau$ is applied, then the object also has a constant angular acceleration, $\alpha$ .

But we also know that

$\alpha = \frac{d\omega}{dt}$

where $\omega$ is the angular velocity: so, a constant angular acceleration means that the angular velocity of the object is changing, so the correct answer is

B) Angular velocity

(moment of inertia and center of gravity do not change since they only depend on the mass and the geometry/shape of the object, which do not change)

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3 years ago

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eimsori [14]

Answer:B

Explanation:

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2 years ago

Which idea did Ptolemy's model use to explain why the planets appeared to move backward as they moved in their orbits? The plane

ruslelena [56]

Answer:

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