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Tresset [83]
2 years ago
5

What's the difference mass and weight

Physics
1 answer:
yanalaym [24]2 years ago
4 0

Answer:

Mass doesn't change.

Weight is measured based on gravitational pull.

Explanation:

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A carbon resistor is 4 mm long and has a constant cross section of 0.2 mm2. The conductivity of carbon at room temperature is 3
tangare [24]

Answer:

The resistance is found to be 6Ω

The current is found to be 0.66 A

Explanation:

The resistance of a conductor in terms of its dimensions is given as:

R = ρL/A

where,

R = resistance = ?

ρ = resistivity = 3 x 10⁴ Ω.m

L = Length = 4 mm = 0.004 m

A = Cross-sectional area = 0.2 mm² = 0.2 x 10⁻⁶ m²

Therefore,

R = (3 x 10⁴ Ω.m)(0.004 m)/(0.2 x 10⁻⁶ m²)

<u>R = 6 Ω</u>

Now, the potential difference between both ends of the resistor is:

ΔV = 16 V - 12 V = 4 V

Now, from Ohm's Law:

V = IR

I = V/R

I = 4 V/ 6 Ω

<u>I = 0.66 A</u>

7 0
3 years ago
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A metre rod on wedge is example of unstable equilibrium.why
Wittaler [7]

Answer:

because it has no balance

7 0
3 years ago
A student is studying a type of wave. Which question will help the student determine if it is an electromagnetic wave?
eimsori [14]
I believe D is the correct answer
5 0
3 years ago
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Explain how a step-down transformer makes electricity safe for use in homes.
siniylev [52]

Answer:

it lowers the voltage in homes

Explanation:

this is due to safety reasons as a human cant survive power line voltages which are between 150k and 760k and if you plugged anything short of a piece of 1 inch thick wire not counting insulation it would immediately start smoking and burn the cable.

6 0
3 years ago
Read 2 more answers
Determine the centroid of the shaded area shown in figure 2. Determine the moment of inertia about y-axis of the shaded area sho
Nady [450]

Answer:

  • centroid: (x, y) = (81.25 mm, 137.5 mm)
  • I = 8719.31 mm^2    for unit mass

Explanation:

Finding the desired measures requires we know a differential of area. That, in turn, requires we have a way to describe a differential of area. Here, we choose to use a vertical slice, which requires we know the area boundaries as a function of x.

The upper boundary is a line with a slope of 125/156.25 = 0.8, and a y-intercept of 125. That is, ...

  y1 = 0.8x +125

The lower boundary is given in terms of y, but we can solve for y to find ...

  100x = y^2

  y2 = 10√x

Then our differential of area is ...

  dA = (y1 -y2)dx

__

The centroid is found by computing the first moment about the x- and y-axes, and dividing those values by the area of the figure.

The area will be ...

  \displaystyle A=\int_0^{156.25}{dA}=\int_0^{156.25}{(y_1-y_2)}\,dx

The y-coordinate of the centroid is ...

  \displaystyle \overline{y}=\dfrac{S_x}{A}=\dfrac{1}{A}\int_0^{156.25}{\dfrac{y_1+y_2}{2}}\,dA=\dfrac{1}{A}\int_0^{156.25}{\dfrac{y_1+y_2}{2}(y_1-y_2)}\,dx=137.5

Similarly, the x-coordinate is ...

  \displaystyle \overline{x}=\dfrac{S_y}{A}=\dfrac{1}{A}\int_0^{156.25}{x}\,dA=\dfrac{1}{A}\int_0^{156.25}{x(y_1-y_2)}\,dx=81.25

That is, centroid coordinates are (x, y) = (81.25, 137.5) mm.

__

The moment of inertia is the second moment of the area. If we normalize by the "mass" (area), then the integral looks a lot like the one for \overline{x}, but multiplies dA by x^2 instead of x.

The attachment shows that value to be ...

  I ≈ 8719.31 mm^2 (normalized by area)

The area is 16276.0416667 mm^2, if you want to "un-normalize" the moment of inertia.

7 0
3 years ago
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