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Angelina_Jolie [31]
4 years ago
15

Explain how a jackscrew is used and how to calculate its ideal mechanical advantage.​

Physics
1 answer:
Len [333]4 years ago
5 0

Answer:

We know that , mechanical advantage of lifting machine is

MA = W / P

For maximum mechanical advantage, we can substitute the value of P = mW + C

Explanation:

im not too sure about this one tho but i hope it helps

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Fossil Fuels are an example of a renewable resource.<br> True or false
slavikrds [6]

Answer:

<h2>False.</h2>

Explanation:

A fossil fuel is a fuel formed by natural processes. Fossil fuels typically have an age of millions of years, and sometimes more than 650 million years. It cannot process to create fossil fuel again.

<h3>Further Explanation:</h3><h3 />

A nonrenewable resource is a natural substance that is not replenished with the speed at which it is consumed. It is a finite resource.

Nonrenewable resources come from the Earth. Humans extract them in gas, liquid, or solid form and then convert them for their use, mainly related to energy. The reserves of these substances took billions of years to form, and it will take billions of years to replace the supplies used.

3 0
4 years ago
Read 2 more answers
In the simple Bohr model of the eighth excited state of the hydrogen atom, the electron travels in a circular orbit around a fix
Ksju [112]

Answer:

Net force on electron will be 12.568\times 10^{-12}N            

Explanation:

We have given that the orbit r=4.28\times 10^{-9}m

Speed of the electron v=2.43\times 10^5m/sec

Mass of the electron is given as m=9.11\times 10^{-31}kg

Centripetal acceleration is given by a_c=\frac{v^2}{r}=\frac{(2.43\times 10^5)^2}{4.28\times 10^{-9}}=1.3796\times 10^{19}m/sec^2

Force is given by F = ma

So force F=9.11\times 10^{-31}\times 1.3796\times 10^{19}=12.568\times 10^{-12}N

8 0
3 years ago
The slow coning pattern of the spin axis of the Earth's precession will move the end of this axis in a complete circle in a peri
GREYUIT [131]

Answer:

26000 years

Explanation:

Precession describes the angular motion of the Earth's body. Since the attitude of telescopes relative to the Earth's body can be controlled with high accuracy, and telescopes can measure the direction of incoming light also with high accuracy, the motion of Earth is under permanent high precision monitoring. Thus the basic numerical descriptor of precission, an angular rate of 5029.0966 seconds of arc per Julian century, traditionally denoted p (for precession) is a measured value from observed coordinate changes of thousands of stars over, say, two centuries. The understanding of this value in terms of forces acting on an oblate Earth from the Moon is well understood so that an extrapolation back and forth over a few full cycles contains little uncertainties. Of course, you can find details on the coordinate transformations mentioned above (the direct observational effect of precession) on the net. I was surprised to see that the Wikipedia article on precession covers the astronomical aspect very poorly. You thus better look for other sources.

3 0
4 years ago
If you ran 15 km/hr for 2.5 hours, how much distance would you cover?
SVETLANKA909090 [29]

Answer: 37.5 km

Explanation:

The question is that

If you ran 15 km/hr for 2.5 hours, how much distance would you cover ?

Where

Speed = 15 km/ hr

Time = 2.5 hours

Using the formula for speed.

Speed = distance/time

Substitute speed and time into the formula

15 = distance/ 2.5

Make distance the subject of formula by cross multiplying.

Distance = 15 × 2.5

Distance = 37.5 km.

6 0
3 years ago
A Red-Tailed Hawk leaves its nest and flies 100.0 meters across the sky in 20 seconds, when it spots a garter snake on the groun
igomit [66]
Speed = distance / time.

Speed of him leaving the nest:
S = 100 / 20sec

5 m/s.

Catching the snake:
S2 = 50 / 5sec

10 m/s.

Average of 5& 10 = 7.5

7.5 m/s has to be the answer.
3 0
3 years ago
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