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3 years ago

What does a negative moment of inertia mean?

1 answer:

8 0

When we are talking about simple Ixx or Iyyvalues, then yes these will always be positive. However, when talking about moment products like Ixy, these will not necessarily be positive, mainly when holes have been cut in these cross sections.

When the holes are cut in, those moments then become negative, and due to the parallel axis theorem sometimes these negative values actually become larger than the initial value, and the moment then becomes negative.

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A sample contains 10g of radioactive isotope. How much radioactive isotope will remain in the sample after 3 half-lives?

Ainat [17]

Answer:

After 1 half-life (500 years), 500 g of the parent isotope will remain. After 2 half-lives (1000 years), 250 g of the parent isotope will remain. After 3 half-lives (1500 years), 125 g of the parent isotope will remain. After 4 half-lives (2000 years), 62.5 g of the parent isotope will remain.

Explanation:

3 0

3 years ago

The basic life function of an organism are carried on by

Lana71 [14]

I believe the answer is a: cells.

3 0

3 years ago

What is the voltage, V2, in units of Volts, across resistor R2 in the circuit shown below where VS = 4V, R1 = 14 Ohms and R2 = 3

svetlana [45]

<h2>Correct answer:</h2>

$\boxed{v_{out}=2,85V}$

<h2>Explanation:</h2>

We can use voltage divider to solve this problem that is defined as the passive linear circuit producing an output voltage $v_{out}$ that is a fraction of its input voltage $v_{in}$ . So we can use the formula:

$v_{out}=\frac{R_{2}}{R_{1}+R_{2}}v_{in}, \ where \ v_{in}=v_{s}=4V \\ \\ \therefore v_{out}=\frac{35}{14+35}(4) \\ \\ \therefore v_{out}=2,85V$

3 0

3 years ago

A uniform, thin rod of length h and mass M is held vertically with its lower end resting on a frictionless horizontal surface. T

saveliy_v [14]

Answer:

$v = \sqrt{gh}$

Explanation:

Since there's no external force beside gravity acting on the rod, we can use the law of energy conservation to calculate for the speed of rod center of gravity before hitting the surface.

Also as the rod is uniform and this, its center of gravity is at distance h/2 from the surface.

$E_k = E_p$

$mv^2/2 = mgh/2$

$v^2 = gh$

$v = \sqrt{gh}$

5 0

3 years ago

3000 J of work are done by an elevator on a man lifting him to a height of 2.5 m in 0.4 seconds? how much energy has the man ga

ANEK [815]

The energy that the man has gained in being lifted is 3000J which is in the form of potential energy.

<u>Explanation:</u>

Given:

Work done, W = 3000J

Height, h = 2.5m

Time, t = 0.4 seconds

Energy gained = ?

As the man gets lifted, it gains potential energy.

Potential energy will be equal to the work done by the elevator.

We know,

potential energy = mgh

Thus, the energy that the man has gained in being lifted is 3000J which is in the form of potential energy.

3 0

3 years ago