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3 years ago

What happen (to the gold leaf) if a negative object is brought near a positively charged electroscope without touching it?

Physics

1 answer:

diamong [38]3 years ago

8 0

Answer:

the sheets approach while the object is near

Explanation:

An electroscope is an apparatus that has two metal sheets attached, when these sheets have a charge and distribute evenly between them and the sheets repel.

When I approach an object charged with a counter (negative) charge, part of the charge of the electroscope moves near the charged external object, to neutralize the electric field, so as the charge on one of the plates decreases the electroscope has approached , as the objects are not touched the system remains in this configuration while the object is close. When the object is released, the electric field it creates disappears, so the positive charges repel inside the electroscope and the sheets repel to the initial position.

In short, the sheets approach while the object is near

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A man weighing 700 NN and a woman weighing 440 NN have the same momentum. What is the ratio of the man's kinetic energy KmKmK_m

Eduardwww [97]

Answer:

The ratio of the man's kinetic energy to that of the woman's kinetic energy is 0.629.

Explanation:

Given;

weight of the man, W = 700 N

Weight of the woman, W = 440 N

momentum is given by;

$P = mv\\\\v = \frac{P}{m}$

Kinetic energy of the man;

$K_m = \frac{1}{2}m_m(\frac{P_m}{m_m})^2 \\\\K_m = \frac{P_m^2}{2m_m}$

Momentum of the man is calculated as;

$P_m^2 = 2m_mK_m$

The kinetic energy of the woman is given by;

$K_w = \frac{P_w^2}{2m_w}$

The momentum of the woman is given;

$P_w^2 = 2m_wK_w$

Since, momentum of the man = momentum of the woman

$P_m^2 = P_w^2$

$2m_mK_m = 2m_wK_w\\\\\frac{K_m}{K_w} = \frac{2m_w}{2m_m}\\\\\frac{K_m}{K_w} = \frac{m_w}{m_m}$

mass of the mas = 700 / 9.8 = 71.429

mass of the woman is = 440 / 9.8 = 44.898

$\frac{K_m}{K_w} = \frac{44.898}{71.429}\\\\\frac{K_m}{K_w} =0.629$

Therefore, the ratio of the man's kinetic energy to that of the woman's kinetic energy is 0.629.

3 0

3 years ago

Which of the following element has seven total valence electrons? Your answer: argon helium oxygen bromine

GalinKa [24]

Answer:

bromine

Explanation:

Any element in the halogen group will have seven valence electrons. These elements include fluorine, chlorine, bromine, iodine, and astatine

6 0

3 years ago

weeeeeb [17]

Answer:

I.72m/s²

II.8m/s²

Explanation:

acceleration equal velocity² divided by length

8 0

3 years ago

use the distributive property to express 16+48. please explain if you can or work it out so I can see how you got your answer. t

Rom4ik [11]

(40+10)+(8+6)
Hope I helped you

6 0

3 years ago

In a collision, a 25.0 kg mass moving at 3.0 m/s transfers all of its momentum to a 5.0 kg mass.

nadezda [96]

Answer:

Explanation:

The momentum of the 25 kg mass is

$p=mv$

$p=25kg*3m/s= 75kg*m/s$

If this whole momentum of the object is transferred to the 5.0 kg object then according to the law of conservation of momentum, the momentum of the 25.0 kg object must be transferred to the 5.0 kg object:

$75kg*m/s = 5.0kg*v$

$v=\dfrac{75}{5}$

$\boxed{v=15m/s}$

8 0

4 years ago