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4 years ago

12

Mass of Sun

1 answer:

Paladinen [302]4 years ago

4 0

Answer:

Percentage of mass converted to energy = 99.9 %

Explanation:

By far most of the solar system's mass is in the Sun itself: somewhere between 99.8 and 99.9 percent. The rest is split between the planets and their satellites, and the comets and asteroids and the dust and gas surrounding our star. Seen from afar (on the scale of distances between stars) the presence of the solar system would not be obvious. We would simply see a normal-looking star. Perhaps we would pick up the presence of Jupiter, which makes up two thirds or so of the solar system outside of the Sun, by mass.

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Why it is easier to lift a small stone but harder to lift heavy one on the surface of Earth

Nesterboy [21]

Answer:

since small stone has less mass so the gravitational pull of the earth is lesser in case of this but this is not for the bigger stone as the gravitational pull of the earth is greater...

PLEASE MARK BRAINLIEST!!!!!

8 0

3 years ago

how much time do it take for a cheetah running at a speed of 31.67m/s to travel a distance of 1361.81m

ExtremeBDS [4]

V=D/T
V is speed
D is distance
T is time
V=D/T
31.67 m/s = 1361.81 m / T
31.67/31.67=1361.81/31.67
T=43 seconds
Hope this helps

8 0

4 years ago

A 2.5 kg , 20-cm-diameter turntable rotates at 70 rpm on frictionless bearings. Two 480 g blocks fall from above, hit the turnta

zhuklara [117]

Answer:

Question: What is the turntable's angular velocity, in rpm, just after this event?

A: 39.6 rpm

Explanation:

Assuming that no external torques act on the system (turntable + blocks) during the collision, total angular momentum must be conserved.

Just before that the two blocks fell down on the turntable, the angular momentum is as follows:

L = I * ω

For a solid disk, the moment of inertia is mr²/2, so we can write I as follows:

I = (2.5*((0.2)²/4)) kg.m² = 0.0125 kg.m²

Taking ω as 70 rpm, we get the value of the initial L as follows:

L = 0.0125 kg.m² * 70 rpm = 0.875 kg.m²*rpm

After the collision, the system has a new moment of inertia, that can be expressed as follows:

If = 0.0125 kg.m² + (2*0.48 kg * ((0.2)² / 4)) = 0.0221 kg.m²

As the total angular momentum must be conserved, we can write the following equation:

L = If * ωf

Solving for ωf:

⇒ ωf = L/If = 0.875 kg.m².rpm / 0.0221 kg.m² = 39.6 rpm

5 0

3 years ago

When you drink cold water, your body must expend metabolic energy in order to maintain normal body temperature (37° C) by warmin

Andre45 [30]

Answer:

$V=12.1622\ L$

Explanation:

Given:

Initial temperature of water, $T_i=0^{\circ}C$

final temperature of water, $T_f=37^{\circ}C$

energy spent in one hour of walk, $Q=450\ kcal=450\times4186=1883700\ J$

volumetric capacity of stomach, $V=1\ L$

<em>Now, let </em><em>m </em><em>be the mass of water at zero degree Celsius to be drank to spend 450 kilo-calories of energy.</em>

We know:

$Q=m.c.\Delta T$ .....................................(1)

where:

m = mass of water

Q = heat energy

$\Delta T=$ temperature difference

$c=4186\ J.kg^{-1}.K^{-1}$ = specific heat capacity of water

<u>Putting values in the eq. (1):</u>

$1883700=m\times 4186\times 37$

$m=12.1622\ kg$

Since water has a density of 1 kilogram per liter, therefore the volume of water will be:

$V=12.1622\ L$

8 0

3 years ago

Pushing a rock from a hill top is called

wariber [46]

It's called "utter disregard for the safety and welfare
of the people standing at the bottom of the hill".

6 0

3 years ago