Photo below with question, please help need to confirm answer
Is the answer A?

Answer:

720 Joules

Explanation:

Given: 60 W light bulb powered by 620,000 J of energy. 20 percent efficient in converting electrical energy into light energy

To find: how many joules of light energy does this light bulb produce each time?

Formula: [tex]E = \frac{hc}{A}[/tex]

Solution: The total amount of energy generated by the light bulb every minute is 3600 Joules. If the light bulb is only twenty (20) percent efficient in converting that energy to visible light energy, that would be twenty percent of the total.

E (Joules) = P (Watts)  X  t (seconds)

E = 60 W  X  60 seconds

E = 3600 Joules of energy

20% of 3600 = 720 Joules

Therefore, it produces 720 joules of light each time.

Our solar system is the only place in the universe where gravity played a key part in the formation of planets.

This is Flase

Answer:

Star, hydrogen and energy

Explanation:

A star is a large ball of gas that generates its own energy by fusing hydrogen atoms to make helium. It is held together by its own gravity. This process emits a tremendous amount of energy, and some of the energy is in the form of light.

The energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. When the core is hot enough, nuclear fusion commences. Fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

Answer:

A and C are 180 deg out of phase (opposite points on a 360 deg wave)

The two points on the periodic wave  which are 180 degrees out of phase are point A and Point C.

The two points of a wave is said to be out of phase when they show up or down motion at different times.

If a point on the wave, say (X) is reached to the maximum or minimum point before the other point. Then these two points are said to be out of phase.

Also, when the points are 180 degree apart from each other. Which means if a point is in the crest of the wave and other is on the through.

The diagram below shows a periodic wave. In this diagram,

Hence, the two points on the periodic wave  which are 180 degrees out of phase are point A and Point C.

Learn more about the periodic wave here;

https://brainly.com/question/16749356

The question is: HELPAAAAAAA A mountain biker moves downhill if he accelerates at 3 m / s2 and takes 15 minutes (900 seconds) down, how far does he travel? HELP ME PLEASE

Answer: The distance travelled by the mountain biker is 2430 km.

Explanation:

Given: Acceleration = [tex]3 m/s^{2}[/tex]

Time = 15 minutes (900 sec)

Displacement = ?

Formula used to calculate the final velocity is as follows.

[tex]v = u + at[/tex]

where,

v = final velocity

u = initial velocity = 0 m/s (here)

t = time

a = acceleration

Substitute the values into above formula as follows.

[tex]v = u + a \times t\\v = 0 + 3 m/s^{2} \times 900 s\\= 2700 m/s[/tex]

The relation between velocity (speed) and distance is as follows.

[tex]Speed = \frac{Distance}{time}\\2700 m/s = \frac{Distance}{900 s}\\Distance = 2430000 m (1 m = 0.001)\\= 2430 km[/tex]

Thus, we can conclude that distance travelled by the mountain biker is 2430 km.

Answer:

I = 1.36 x 10⁻⁴ W/m²

Explanation:

The intensity of the sound produced by the Elephant can be calculated by using the following formula:

[tex]I = \frac{P}{A} \\\\[/tex]

where,

I = Intensity of sound = ?

P = power of sound = 0.45 W

A = area = πr² = π(32.5 m)² = 3318.3 m²

Therefore,

[tex]I = \frac{0.45\ W}{3318.3\ m^2} \\\\[/tex]

I = 1.36 x 10⁻⁴ W/m²

What process is represented by this redox equation ?

6H 2 O+6CO 2 C 6 H 12 O 6 +6O 2

This equation is of the process of photosynthesis. The proper equation is :-

6CO2+6H2O→C6H12O6+6O2.

Answer:

Explanation:

Here, we are asked to calculate the average speed in km/minute.

As we know that,

Here,

→ Total distance = 10 km + 10 km

→ Total distance = 20 km

→ Total time = 8 minutes + 2 minutes

→ Total time = 10 minutes

Substitute the values in the formula of average speed,

→ Average speed = Total distance ÷ Total time taken

→ Average speed = 20km ÷ 10 minutes

Answer:

Heat

Explanation:

Because chemical energy is stored, it is a form of potential energy. When a chemical reaction takes place, the stored chemical energy is released. Heat is often produced as a by-product of a chemical reaction – this is called an exothermic reaction.

Hope this helped.

Explanation:

Answer Should be B.

Its in Form of Heat.

Answer:

Fossil fuels store energy from the sun as

Answer:

Let No be initial no of atoms

N = N0 / 2      after 1 half-life

N = N0 / 4     after 2 half-lives

So after 2 half-lives 20 of the 80 atoms remain

R = 18 ohms

Explanation:

Given:

V = 36 volts

I = 2.0 A

R = ?

Use Ohm's law to solve for the resistance:

V = IR

or

R = V/I

= (36 volts)/(2.0 A)

= 18 ohms

Answer:

Explanation:

11.) d

12.) f

13.) c

15.) i

pls give me brainliest

Answer:

I believe the answer is D: Conductor.

Answer:

yes

Explanation:

moving earth makes us stand on ground

Answer:

the rotation of the earth can affect your weight but not gravity

The force of gravity between two masses increases as they are moved closer together.

option D.

Newton's law of universal gravitation states that the magnitude of the force between two masses is directly proportional to the product of the two masses and inversely proportional to the square of the distance between them.

F = GM²/R²

where;

The force of gravity between two masses increases as they are moved closer together. This is because gravity is an attractive force that depends on the distance between the masses.

Learn more about  force of gravity here: https://brainly.com/question/2537310

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Explanation:

the correct answer is (true) if am not mistaking incase am wrong sorry

Answer:

The current is halved

Explanation:

The relationship between the current and the resistance is given by Ohm's Law, as follows:

[tex]V = IR\\I = \frac{V}{R}[/tex]

where,

V = Voltage

I = Current

R = Resistance

Therefore, if we double the resistance:

[tex]I' = \frac{V}{2R}\\\\I' = \frac{1}{2}I[/tex]

Hence the correct option is:

The current is halved

Answer:

A

Explanation:

Answer:

v = 3.84 m/s

Explanation:

In order for the riders to stay pinned against the inside of the drum the frictional force on them must be equal to the centripetal force:

[tex]Centripetal\ Force = Frictional\ Force\\\\\frac{mv^2}{r} = \mu R = \mu W\\\\\frac{mv^2}{r} = \mu mg\\\\\frac{v^2}{r} = \mu g\\\\v = \sqrt{\mu gr}[/tex]

where,

v = minimum speed = ?

g = acceleration due to gravity = 9.81 m/s²

r = radius = 10 m

μ = coefficient of friction = 0.15

Therefore,

[tex]v=\sqrt{(0.15)(9.81\ m/s^2)(10\ m)}[/tex]

v = 3.84 m/s

Answer:

La segunda ley de Newton define la relación exacta entre fuerza y aceleración matemáticamente. La aceleración de un objeto es directamente proporcional a la suma de todas las fuerzas que actúan sobre él e inversamente propocional a la masa del objeto, Masa es la cantidad de materia que el objeto tiene.

Explanation:

corona y corazon plis

[tex] \large{ \tt{❃ \: ANSWER}} : [/tex]

☄ Newton's second law of motion states that," acceleration produced in a body is directly proportional to the force applied to it in the direction of motion and inversely proportional to its mass ". This Newton's second law of motion describe the relationship between force and Acceleration.

[tex] \large{ \tt{☃ \: SOME \: EXAMPLES}} : [/tex]

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Answer:

Thermal energy can be transferred to one object to another in the form of heat. It causes molecules and atoms to collide with each other because of the rising of heat.

Explanation: Well thermal energy is a example of kinetic energy. It is heated by motion. It is heat that can be measured

Answer:

diffraction is the correct answer

Answer:

If I did my calculations correctly then the answer is 11 but I may be weong

Answer:

it's 11

gkccgkxcgikvxxkg

Answer:

W = 0 J

Explanation:

The amount of work done by gas at constant pressure is given by the following formula:

[tex]W = P\Delta V[/tex]

where,

W = Work done by the gas

P = Pressure of the gas

ΔV = Change in the volume of the gas

Since the volume of the gas is constant. Therefore, there is no change in the volume of the gas:

[tex]W = P(0\ m^3)\\[/tex]

W = 0 J

Answer:

C. Experimental Probability

Explanation:

The empirical (or experimental) probability means the event that arise and depend how the event arise when the data is collected from an experiment in a more no of trials. It would be depend upon the direct observation. Here each and every observation in an experiment is known as trial

So the probability that depend upon the experiment observation is known as the experimental probability

Hence, the option c is correct