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GREYUIT [131]
3 years ago
11

What is the magnitude of the electric field at a point 0.0055 m from a 0.0025

Physics
1 answer:
allochka39001 [22]3 years ago
7 0

Answer:

Explanation:

The equation for the electric field is

E=\frac{kQ}{r^2} so filling in:

E=\frac{9.00*10^9(.0025)}{(.0055)^2} which in the end gives you

E = 7.4 × 10¹¹, choice A

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Why do these two magnets attract each other?
Liono4ka [1.6K]

Answer:

A

Explanation:

When two magnets are brought near each other, like poles repel; opposite poles attract. We like to represent this force effect of a magnet on iron-like objects with a concept called magnetic field. The concept of field can be best understood if we remember the gravitational force of Earth on object near it.

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How often do industrial oxygen cylinders need to be tested
hjlf

Answer:

5 years

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3 years ago
A ball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. If the ball hits the floor with a speed of
Alla [95]

Answer:

Change in momentum is 1.1275 kg-m/s

Explanation:

It is given that,

Mass of the ball, m = 274 g = 0.274 kg

It hits the floor and rebounds upwards.

The ball hits the floor with a speed of 2.40 m/s i.e. u = -2.40 m/s  (-ve because the ball hits the ground)

It rebounds with a speed of 1.7 m/s i.e. v = 1.7 m/s (+ve because the ball rebounds in upward direction)

We have to find the change in the ball's momentum. It is given by :

\Delta p=p_f-p_i

\Delta p=m(v-u)

\Delta p=0.275\ kg(1.7\ m/s-(-2.4\ m/s))

\Delta p=1.1275\ kg-m/s

So, the change in the momentum is 1.1275 kg-m/s

3 0
3 years ago
The value of gravitational acceleration of a body on Earth is 9.8 meters/second2. The gravitational potential energy for a 1.00
solong [7]
PE = mgh₁ - mgh₂= 12.5J

h₁ = ?
h₂ = 0

h₁ = PE / mg = 12.5 / 9.8


6 0
3 years ago
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A table is pushed 15m across a room with a force of 50n.
kari74 [83]

Answer:

<em>The work is 750 J</em>

<em>The power is 37.5 watt</em>

Explanation:

<u>Mechanical Work and Power</u>

Mechanical work is the amount of energy transferred by a force. It's a scalar quantity, with SI units of joules.

Being \vec F the force vector and \vec s the displacement vector, the work is calculated as:

W=\vec F\cdot \vec s

If both the force and displacement are parallel, then we can use the equivalent scalar formula:

W=F.s

Power is the amount of energy transferred or converted per unit of time. In the SI, the unit of power is the watt, equal to one joule per second.

The power can be calculated as:

\displaystyle P=\frac {W}{t}

Where W is the work and t is the time.

a)

The table is pushed d=15 m across a room with a force F=50 N, thus the work is:

W=50 * 15 = 750 J

The work is 750 J

b)

The time needed to push the table is t=20 seconds, thus:

\displaystyle P=\frac {750}{20}=37.5

The power is 37.5 watt

7 0
3 years ago
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