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4 years ago

How does gravity and density affect weight

Physics

1 answer:

frozen [14]4 years ago

7 0

Gravity affects weight because gravity creates weight. Objects have mass, which is defined as how much matter an object contains. Weight is defined as the pull of gravity on mass.

The relation between weight and gravitational pull is such that, when on another celestial body, the difference in gravity would alter a person's weight. The Earth's moon, for example, has a gravitational field that is 0.165 times the pull on earth. A person who weighs 170 pounds on Earth would only weigh 28.05 pounds on the moon. This is why during the moon landing videos, people on earth viewed the astronauts taking large, bounding steps. With very little weight, it was easy for them to push off the ground.

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Which of the following is the energy of motion?

Bogdan [553]

Kinetic energy is the energy of the motion.

This is because the kinetic energy can be calculated by using the formula,

K.E.=1/2 mv^2

where, v is the velocity of moving body i.e. the body is in motion.

8 0

4 years ago

Which statement correctly relates the first and second laws of thermodynamics?

o-na [289]

Thermal-energy flow between objects is conserved and always flows from the warmer object to the cooler object.

Here 'conserved' means that the amount of thermal energy lost of by one body is exactly equal to the amount of thermal energy gained by another body, which is the statement of the first law.

According to second law, we do not see objects warming up on their own. For example, if we have a cup of coffee left to itself, we would always see that it cools down. Here, thermal energy is being transferred from warmer object (coffee) to cooler objects (the air in the room).

4 0

3 years ago

Choose the sources of gamma rays. Check all that apply.

harina [27]

Answer:

a. Stars all warm objects

c. Some unstable atomic nuclei

Explanation:

Gamma rays are photons of very high energy (beyond 100keV) enough to remove an electron from its orbit.

They have a very short wavelength, less than 5 meters from the peak, and can be produced by nuclear decay, especially in the breasts of massive stars at the end of life.

They were discovered by the French chemist Paul Villard (1860 to 1934).

While X-rays are produced by electronic transitions in general caused by the collision of an electron with an atom at high speed, gamma rays are produced by nuclear transitions.

Gamma rays produce damage similar to those caused by X-rays or ultraviolet rays (burns, cancer and genetic mutations).

The sources of gamma rays that we observe in the universe come from massive stars (hypernovas) or some warm objects on the space that end their lives by a gravitational collapse that leads to the formation of a neutron star or a black hole, as well as unstable radioactive nuclei that emit radiation gamma to reach its steady state.

7 0

4 years ago

Derive velocity-time relation from velocity-time graph

Brrunno [24]

Explanation:

hope this helps you

.....,.......

7 0

3 years ago

A proton and an alpha particle (q = +2e, m = 4 u) are fired directly toward each other from far away, each with an initial speed

stich3 [128]

Answer:

Distance of closest approach, $r=1.91\times 10^{-14}\ m$

Explanation:

It is given that,

Charge on proton, $q_p=e$

Charge on alpha particle, $q_a=2e$

Mass of proton, $m_p=1.67\times 10^{-27}\ kg$

Mass of alpha particle, $m_a=4m_p=6.68\times 10^{-27}\ kg$

The distance of closest approach for two charged particle is given by :

$r=\dfrac{k2e^2(m_p+m_a)}{2m_am_pv_p^2}$

$r=\dfrac{9\times 10^9\times 2(1.6\times 10^{-19})^2(1.67\times 10^{-27}+6.68\times 10^{-27})}{2\times 6.68\times 10^{-27}\times 1.67\times 10^{-27}(0.01\times 3\times 10^8)^2}$

$r=1.91\times 10^{-14}\ m$

So, their distance of closest approach, as measured between their centers $1.91\times 10^{-14}\ m$ . Hence, this is the required solution.

4 0

3 years ago