3 years ago

What is the best example of rotational motion

Physics

2 answers:

Norma-Jean [14]3 years ago

8 0

How about the spinning of a CD, DVD, or vinyl LP ? (remember those ?)

quester [9]3 years ago

7 0

A rotation motion is a motion that takes place around a fixed axis.

Like gears turning on each other.

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an open cart is moving along a straight frictionless horizontal track. When rain starts falling vertically into the cart, what h

fgiga [73]

Answer:

The speed of the cart decreases

Explanation:

The track is frictionless, so we can consider the cart as isolated system (no external forces acting on it): therefore, the momentum of the cart is conserved

$p=mv=const.$

where m is the mass and v the speed of the cart.

When it starts raining, some water falls into the cart: this means that the mass of the cart, m, increases. But we said that the momentum, p, must remain constant: in order for that to happen, this means that the speed of the cart, v, must decrease (because the relationship $mv=const.$ is an inverse relationship, so if m increases, v must decrease).