I can not find the answer to the one after potassium ?

Answer:

4.2

Explanation:

Answer:

A

Explanation:

going upward, kinetic energy decrease and potential energy increase

Answer:

A

Explanation:

As a ball is thrown into the sky, potential energy increases and kinetic energy decreases. But, the mechanical energy ( that is the sum of the potential and kinetic energy) remains the same....

Answer:

B

Explanation:

Answer: B

The immense volume of matter 

Explanation:

Stars are formed by cloud and dust, draw together by gravity.

But the longevity of a main sequence star lives depends on how massive it is. An enormous massive star burns faster due to its enormous material it contains and higher core temperatures caused by greater gravitational forces. While a less massive star will burn slowly and stick around the sun for a very long period. The structure of a main sequence star like our sun can therefore hold for a long time because of the immense volume of matter of star.

Answer:

C is correct

Explanation:

Answer:

15 N

Explanation:

Answer:

the answer is b .Gilbert

Explanation:

hope it helps !

The power of the light bulb is 15 watts.

Power in physics is defined as the rate of energy per unit time or in other words the work done by any electrical appliance per unit time. Power is expressed as -

P = E/T where E is Energy and T is the time period.

Given that the light bulb emits 30 J light energy in 2 seconds.

We have E = 30J and T = 2 seconds.

Therefore power(P) = Energy(E) / Time(T)

∴  P = 30 / 2 = 15 watts

Thus the power of the light bulb is 15 watts.

To learn more about power in physics, refer -

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Answer:

Explanation:

Oxygen and carbon dioxide

Answer:

It can do work on an object by moving it or changing it.

Explanation:

Brainliest?

Answer:

If you push on an object, thats positive work but if you pull on the object, thats negative work

Explanation:

Answer:

6000J

Explanation:

T=m.g.h

T=200.(10).(3)

T=2000.(3)=6000J

Answer:

Explanation:

current measures charge flowing per second .

A current of .867 A means charge of .867 coulomb is flowing per second

charge flowing per minute = .867 x 60

= 52.02 coulomb

one electrons carries a charge of 1.6 x 10⁻¹⁹ Coulomb

So no of charge flowing per minute

= 52.02 / 1.6 x 10⁻¹⁹

= 32.5 x 10¹⁹ .

B )

electrical energy consumed per minute

= V X I X t , V is volt , I is current and t is time .

= 122 x .867 x 60

= 6346.44 J .

Answer:

SI unit

1) SI unit does not depend on other.

2) they have their own identity.

Derived unit

1) They depend upon other or fundamental unit.

2) they don't have their own identity.

Answer:

Potential energy

441 joules

Explanation:

The flower pot is not moving so it does not have kinetic energy. Anything that is still and a distance from the ground does have potential energy.

Amount of energy: p=mggh

p=1.5(9.8)(30)=441 joules

The flower pot's energy is measured in potential energy since it is remaining stationary and the energy is stored,  the flowerpot is not moving about so it is not kinetic energy.

The formula for potential energy is:

GPE = mgh

The m stands more mass, the g stands for gravitational energy (9.8m/s^2) and the h stands for height.

Our values for the following terms are:

M = 1.5kg

G = 9.8m/s^2

H = 30 meters

Now, we can plug it into our formula to solve for the amount of potential energy.

GPE = 1.5(9.8)(30)

First, let's multiply the gravitational energy and the height.

30 x 9.8 = 294

Then, multiply the mass by the result.

1.5 x 294 = 441

Therefore, the potential energy of the flowerpot is 441J.

Answer:yes

Explanation: what project

Answer:1.1 A

Explanation:

Given

Resistance of appliance [tex]R=200\ \Omega[/tex]

We know common house hold voltage in India is [tex]220\ V[/tex]

and according to ohm's law

[tex]V=IR[/tex]

So, current

[tex]I=\frac{220}{200}[/tex]

[tex]I=1.1\ A[/tex]

Answer:

Work done, W =1520 J

Explanation:

We have,

The brakes on a bicycle apply 95 N of force to the wheels. When the  brakes are applied, the bicycle comes to a stop in 16 m.

It is required to find the work done by the brakes on the wheels. We know that the product of force and displacement is equal to the work done. It is given by :

[tex]W=Fd\\\\W=95\times 16\\\\W=1520\ J[/tex]

So, the work done by the brakes is 1520 J.

Answer:

false, each force might have a different about and a different direction

False because each force might have a different about and a different direction.

A force in physics is an effect that has the power to alter an object's motion. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

The vector sum of all the forces equals the net force. In other words, the net force is the sum of all forces, it is obtained by combining all forces as vectors. The net force is the sum of the force vectors A + B + C for the situation of the three forces on the force board.

Work done due to force is given as,

Work done, W = F.S cosФ

Where F is force a vector quantity, S is displacement and Ф is angle between them.

When forces are exerted in different direction than net force is calculated using vector sum.

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Answer:

It is Potential and corresponding to

90

J

.

Explanation:

Potential Energy is energy stored in the system and ready (potentially) to be changed into, say, Kinetic Energy through movement.

The general expression for Gravitational Potential Energy is:

U=mgh

where:

mg is the weight; h is the height relative to a certain reference level (the ground in this case) choosen to have zero Potential Energy.

With your data we get:

U=3⋅30=90J

Answer:

When you jump down, your kinetic is converted to potential energy of the stretched trampoline. The trampoline's potential energy is converted into kinetic energy, which is transferred to you, making you bounce up. At the top of your jump, all your kinetic energy has been converted into potential energy. Right before you hit the trampoline, all of your potential energy has  been converted back into kinetic energy. As you jump up and down your kinetic energy increases and decrease.

Answer:

D

Explanation:

The color you see is the color the object reflectes. The rest of the color are absorbed by that object.

Answer:

Yes, they are.

Explanation:

Answer:

No.

Explanation:

Pushing is the act of moving an object "forward" or towards the desired location.

Friction generally occurs when two surfaces (in this case, the ground and the object you are pushing) rub against each other. Gravity & the heaviness of the object will act as the counter to the force applied to push the object. Friction is the object trying to stay still, while pushing is trying to move the object.

~

Answer:

Visible light

Explanation:

Answer:

C visible light

Explanation:

Answer:

Mercury 0.39 AU, 36 million miles

57.9 million km

Venus 0.723 AU

67.2 million miles

108.2 million km

Earth 1 AU

93 million miles

149.6 million km

Mars 1.524 AU

141.6 million miles

227.9 million km

Jupiter 5.203 AU

483.6 million miles

778.3 million km

Saturn 9.539 AU

886.7 million miles

1,427.0 million km

Uranus 19.18 AU

1,784.0 million miles

2,871.0 million km

Neptune 30.06 AU

2,794.4 million miles

4,497.1 million km

Pluto (a dwarf planet) 39.53 AU

3,674.5 million miles

5,913 million km

Answer:

Mercury 0.39 AU, 36 million miles 57.9 million km

Venus 0.723 AU 67.2 million miles 108.2 million km

Earth 1 AU 93 million miles 149.6 million km

Mars 1.524 AU 141.6 million miles 227.9 million km

Jupiter 5.203 AU 483.6 million miles 778.3 million km

Saturn 9.539 AU 886.7 million miles 1,427.0 million km

Uranus 19.18 AU 1,784.0 million miles 2,871.0 million km

Neptune 30.06 AU 2,794.4 million miles 4,497.1 million km

Pluto (a dwarf planet) 39.53 AU 3,674.5 million miles 5,913 million km

Explanation:

Answer:

2.5 hours is the answer according to me

Answer:

Dinesh should put the fulcrum 2 m from himself and 7 m from the package.

Explanation:

Let the fulcrum be x meters from Dinesh's end.

The sum of clockwise moment must balance the sum of anti-clockwise moment.

Taking a moment about the fulcrum

(Force exerted by Dinesh) × (Distance of Dinesh from the fulcrum) = (Weight of the package) × (Distance of the package from the fulcrum)

Force exerted by Dinesh = 1127 N

Distance of Dinesh from the fulcrum = x m

Weight of the package = 322 N

Distance of the package from the fulcrum = (9 - x) m

1127 × x = 322 (9 - x)

1127x = 2,898 - 322x

1127x + 322x = 2,898

1449x = 2898

x = (2898/1449) = 2 m

Hence, Dinesh should put the fulcrum 2 m from himself and 7 m from the package.

Hope this Helps!!!