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3 years ago

As an object falls to the ground, its potential energy is being converted to kinetic energy.

Physics

1 answer:

alekssr [168]3 years ago

5 0

Answer:

<em>The statement is true</em>

Explanation:

<u>Energy Conversion </u>

When an object starts to fall in free air, it speeds up as it falls. The force of gravity acting on the object causes energy to be transferred from its gravitational potential energy to its kinetic energy. We can safely say the height converts to speed and vice-versa. If no external forces act on the system, we can easily calculate heights and speeds by knowing the total mechanical energy (gravitational potential plus kinetic) is conserved.

Answer:

$\boxed{\text{The statement is true}}$

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What is the resistance at 20°C of a 2.0-meter length of tungsten wire with a cross-sectional area of 7.9 10^-7

Bad White [126]

Answer:

1.4 * 10 ^-1 Ω

Explanation:

Hi,

For this question, we gotta use the formula

R = pL/A

p = The resistivity of your material at 20°C

L = length of the wire

A = cross-sectional area

The resistivity of tungsten is 5.60 * 10^-8 at 20°C

By plugging the values, we get:

R = (5.60 * 10^-8)(2.0)/(7.9*10^-7) = 1.4 * 10 ^-1 Ω

8 0

2 years ago

What can cause an increase in density that results in a deep ocean current

mrs_skeptik [129]

The movement of plates

5 0

3 years ago

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Photographs of many young stars show long jets of material apparently being ejected from their poles.

Rudiy27

Answer:

A) True

Explanation:

Researchers have detected numerous jets of gas ejected from poles of young stars and planetary nebulae.

By examining images of hydrogen molecules excited at infrared wavelengths, scientists have been able to see through the gas and dust in the Milky Way, in order to observe the most distant targets. These goals are normally hidden from view and many of them have never been seen before.

The entire study area covers approximately 1,450 times the size of the full moon, or the equivalent of an image of 95 gigapixels. The survey reveals jets emanating from proto-stars and planetary nebulas, as well as remnants of supernovae, the illuminated edges of vast clouds of gas and dust, and the warm regions that surround massive stars and their associated groups of smaller stars.

7 0

3 years ago

What is the relation between the weight of a body and acceleraton due to gravity?

emmainna [20.7K]

Answer:

All objects on Earth, regardless of their mass, accelerate due to gravity at the same rate - that is, 9.8 m/sec2. The weight of an object can be calculated using the formula for force - F = m * a - where F equals the weight of the object and now the acceleration (a) is the acceleration of gravity (g).

6 0

2 years ago

Col. John Stapp led the U.S. Air Force Aero Medical Laboratory's research into the effects of higher accelerations. On Stapp's f

Lerok [7]

Answer:

A. $a=203.14\ \frac{m}{s^2}$

B.s=397.6 m

Explanation:

Given that

speed u= 284.4 m/s

time t = 1.4 s

here he want to reduce the velocity from 284.4 m/s to 0 m/s.

So the final speed v= 0 m/s

We know that

v= u + at

So now by putting the values

0 = 284.4 -a x 1.4 (here we take negative sign because this is the case of de acceleration)

$a=203.14\ \frac{m}{s^2}$

So the acceleration while stopping will be $a=203.14\ \frac{m}{s^2}$ .

Lets take distance travel before come top rest is s

We know that

$v^2=u^2-2as$

$0=284.4^2-2\times 203.14\times s$

s=397.6 m

So the distance travel while stopping is 397.6 m.

8 0

3 years ago

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