3 years ago

Hi, please help me this question

1 answer:

5 0

3. Plastic rubbed in hair would make the plastic negatively charged and the hair positively charged. This means that the attractive force between the paper and plastic is greater than the repulsive force between paper and plastic. The net result is an attraction between the paper and the plastic.

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Two charged point particle are located at two vertices of an equilateral triangle and the electric field is zero at the third ve

Debora [2.8K]

Answer:

Option E

Explanation:

In the presence of two point charges at the two vertices of an equilateral triangle, the resultant electric field at the third vertex due to these charges can not be zero whether the charges are identical or not.

The reason being that only of the x or y component of the field can be cancelled out in either case still the total field can't be reduced to zero.

This can only be achieved if another charge is present.

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4 years ago

Which of the following will cause a decrease in an object's weight? Increase in the mass of the object Decrease in the mass of t

Paul [167]

A decrease in mass will decrease an objects weight because
weight = mass x gravitational constant

4 0

3 years ago

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A boat of mass 225 kg drifts along a river at a speed of 21 m/s to the west. what impulse is required to decrease the speed of t

zzz [600]

The impulse required to decrease the speed of the boat is equal to the variation of momentum of the boat:
$J=\Delta p=m \Delta v$
where
m=225 kg is the mass of the boat
$\Delta v=v_f-v_i=15 m/s-21 m/s=-6 m/s$ is the variation of velocity of the boat
By substituting the numbers into the first equation, we find the impulse:
$J=m\Delta v=(225 kg)(-6 m/s)=-1350 N s$
and the negative sign means the direction of the impulse is against the direction of motion of the boat.

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4 years ago

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Given a force of 100 N and a acceleration of 5 m/s, what is the mass

SIZIF [17.4K]

Answer:

$force = mass \times acceleration \\ 100 = m \times 5 \\ m = \frac{100}{5} \\ m = 20 \: kg$