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2 years ago

Do all objects fall at the same rate?and if they do not why?

1 answer:

6 0

No, I heavier object will fall much faster than something lighter than it. This is because it’s more dense and hard so it can cut through the air particles quicker than a lighter object which takes longer to cut through the air and fall

Example:

A rock vs a feather
The rock will fall quicker because it’s more dense and falls straight down and the feather will be slower because it flows slowly down through the air particles

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Work is the ability to cause what?

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Work is the ability to cause life change??

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What type of energy transformation is taking place when natural gas is used to heat water

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Thermal energy transformation is taking place.

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What is the relationship between electrostatic force and electric field?

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Electrostatic attraction. The stronger the electric field, the greater the electrostatic force.

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2 years ago

A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, and the ball

Aleksandr [31]

Answer:

the velocity (magnitude and direction) of the ball) just before the collision is $v_i = 5.144 \ m/s$

The velocity (magnitude and direction) of the ball) just after the collision is $v_f = - 1.129 \ m/s$

Explanation:

According to the law of conservation of energy;

$m__{ball}} gh = \frac{1}{2}m__{ball}}v_i^2\\\\2* m__{ball}} gh = m__{ball}}v_i^2\\\\v_i^2 = \frac{2*m_{ball}gh}{m_{ball}}\\\\v_i^2 = 2gh\\\\v_i = \sqrt{2gh} \\\\v_i = \sqrt{2*9.8*1.35}\\\\$

$v_i = 5.144 \ m/s$

Thus; the velocity (magnitude and direction) of the ball) just before the collision is $v_i = 5.144 \ m/s$

Since, Air resistance is negligible, and the collision is elastic.

The equation for the conservation of momentum and energy can be expressed as:

$v_f = [\frac{m_1 -m_2}{m_1+m_2}]v_i\\\\v_f = [\frac{m_{ball} -m_{block}}{m_{ball}+m_{block}}]v_i\\\\v_f = [\frac{1.6 -2.5}{1.6+2.5}]*5.144\\\\$

$v_f = - 1.129 \ m/s$

The velocity (magnitude and direction) of the ball) just after the collision is $v_f = - 1.129 \ m/s$

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2 years ago

What is the current in a circuit that has a resistance of 30 ohms and a power of 2 watts

mamaluj [8]

Answer:

0.2581 Ampere

Explanation:

0.2581 Ampere is the current in a circuit that has a resistance of 30 ohms and a power of 2 watts.

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3 years ago