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2 years ago

A student believes a metal rod will gain a negative static charge when

Physics

1 answer:

Dennis_Churaev [7]2 years ago

3 0

Answer:

no, when a plastic rod is rubbed with a duster, electrons are transferred from one material to the other. The material that gains electrons becomes negatively charged. The material that loses electrons becomes positively charged.

Explanation:

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Using the law of conservation of angular momentum, estimate how fast a collapsed stellar core would spin if its initial spin rat

Nataly_w [17]

Answer:

$\omega_{f} = 1000000\,\frac{rev}{day}$

Explanation:

The law of conservation of angular momentum states that angular momentum remains constant when there is no external moment or forces applied to the system. Let assume that star can be modelled as an sphere, then:

$\frac{2}{5}\cdot M\cdot R_{o}^{2} \cdot \omega_{o} = \frac{2}{5}\cdot M\cdot R_{f}^{2} \cdot \omega_{f}$

The final angular speed is:

$\omega_{f} = \omega_{o}\cdot (\frac{R_{o}}{R_{f}})^{2}$

$\omega_{f} = (1\,\frac{rev}{day} )\cdot (\frac{10000\,km}{10\,km} )^{2}$

$\omega_{f} = 1000000\,\frac{rev}{day}$

3 0

3 years ago

With a 900 V source, voltage is divided across 3 series resistors of 300 V, 280 V, and:

telo118 [61]

Answer:

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6 0

2 years ago

When a stress is applied to rocks within the lithospere, the rocks will tend to deform ...?

grandymaker [24]

The answer to your question is true

6 0

3 years ago

In which case would electrical potential energy be built up and stored in the electric field? a) A positive charge is moved towa

mr_godi [17]

Answer:

The correct option is B

Explanation:

Although, it is common knowledge that in an electric field, unlike charges attract and like charges repel. However, to build up an electric potential, a positive charge is brought close to another positive charge - this causes work done to be changed to electric potential energy and stored in the electric field.

It should however be noted that when a negative charge is moved away from a positive charge, the negative charge gains electric potential energy.

5 0

2 years ago

Use newton's third law to explain why a blown up balloon but untied balloon will fly around the room when you let it go? really

den301095 [7]

Newton's third law of motion states that for every action there is an equal and opposite reaction. The balloon travels in the opposite direction as the air escaping from it. So when gas is released from the balloon it pushes against the outside air and the outside air pushes back. As a result of this the rocket is propelled forward by the opposing force. This opposing force is thrust.

Hope this helps!
Can u plz mark me as brainliest? I really need it!

5 0

3 years ago