What is the difference between average and instantaneous speed?

1 answer:

8 0

Average speed is the speed averaged over a span of time. instantaneous speed is any speed given instant within that time

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The earth has about 80 times the mass of the earth's moon. The gravitational force exerted on the moon by the earth has what rel

chubhunter [2.5K]

Answer:

Both forces are the same.

Explanation:

The problem states that:

$m_e = 80*m_m$

The force exerted on the moon by earth is given by:

$F_m=\frac{K*m_e*m_m}{d^2}$ where K is the gravitational constant, and d is the separation distance between the earth and the moon.

The force exerted on the earth by moon is given by:

$F_e=\frac{K*m_m*m_e}{d^2}$ where K is the gravitational constant, and d is the separation distance between the earth and the moon.

The relation is therefore:

$F_m/F_e = \frac{K*m_e*m_m/d^2}{K*m_m*m_e/d^2}=1$

As you can see, they are the same.

4 0

4 years ago

Will the centripetal force on the bob be different on the moon

ivanzaharov [21]

Hello
I think some details of the question are missing. However, I believe you are referring to a bob following some circular path. Therefore, the answer is "no": in fact, the centripetal force is equal on the earth and on the moon.

Keep in mind that the centripetal force is given by
$F=m \frac{v^2}{r}$
where m is the mass, v the tangential velocity and r the radius of the circular motion. The mass m of the bob is the same on the earth and on the moon, so the centripetal force is the same.

5 0

3 years ago

Resistors and reactors, for use over 600 volts, shall not be installed in close enough proximity to combustible materials to con

suter [353]

Resistors and reactors, for use over 600 volts, shall not be installed in close enough proximity to combustible materials to constitute a fire hazard and shall have a clearance of not less than<u> 300 mm </u>from combustible materials.

Explanation:

The hazards associated with high power industrial resistors are primarily due to their open construction, which is necessary for cooling.
The exposed conductors which make up the resistors can be not only a shock hazard but also a thermal burn hazard.
When a resistor fails, it either goes open or the resistance increases. When the resistance increases, it can burn the board, or burn itself up.
Avoid touching non-flammable resistors in operation; the surface temperature ranges from approximately 350 °C to 400°C when utilized at the full rated value. Maintaining a surface temperature of 200°C or less will extend resistors service life.
Do not apply power to a circuit while measuring resistance. When you are finished using an ohmmeter, switch it to the OFF position if one is provided and remove the leads from the meter.
Always adjust the ohmmeter for 0 (or in shunt ohmmeter) after you change ranges before making the resistance measurement.