Which energy conversion takes place when a solar cell is used to light a street lamp?
A. solar energy → light energy

B. solar energy → electric energy → light and heat energy

C. solar energy → light and heat energy

D. heat energy → light energy

E. heat energy → light energy → electric energy

Answer:

convection thermal energy causes ocean currents?

Answer:

I think it is 50 j, I am not sure and also please let me know if I am wrong.

Answer: hey

Explanation:

Answer:

Velocity = 20.18 m/s

Explanation:

Velocity can be defined as the rate of change in displacement (distance) with time. Velocity is a vector quantity and as such it has both magnitude and direction.

Mathematically, velocity is given by the equation;

[tex]Velocity = \frac{distance}{time}[/tex]

[tex]V = \frac{d}{t}[/tex]

Given the following data;

Distance, d = 3330m

Time, t = 165 secs

*To find the velocity*

Substituting into the equation, we have;

[tex]V = \frac{3330}{165}[/tex]

Velocity = 20.18 m/s

Answer: Oxidation

Explanation:

Because it is :)

Answer:

A. Oxidation

Explanation:

IVLA - I just finished the test. Trust me.

An interaction between electricity and magnetism produces an

electromagnet, while a permanent magnet induces the paper clip's

magnetic field. Hence, option (C) is correct.

An object that can generate a magnetic field, attract unlike poles, and repel like poles is referred to as a magnet.

Magnets that are frequently utilised are permanent magnets. Because they maintain their magnetic quality after being magnetised, they are referred to as permanent magnets.

A coil of wire is used to create electromagnets (wire curled in series). This generates a magnetic field more effectively than a wire running straight. By tightly winding a wire around a strong magnetic core formed of an iron-based substance, this effect can be amplified. In the image above, a coil is seen wrapped around an iron nail. The iron nail is not magnetic on its own.

Learn more about magnet here:

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Answer:

W₁ = 8.12 N

Explanation:

Consider the weight supported by the person and friend to be:

W₁ = Weight supported by person

W₂ = Weight supported by Friend

Now, their sum must be equal to total weight of ladder. Hence,

W₁ + W₂ = 130 N

W₂ = 130 N - W₁   ---------------- equation (1)

Now, to carry the ladder, the moment due to both person's forces must be equal:

Moment due to person 1 = Moment due to friend

W₁ d₁ = W₂ d₂

where,

d₁ = distance between person and center of gravity = 1.5 m

d₂ =  distance between friend and center of gravity = 0.1 m

W₁(1.5 m) = W₂(0.1 m)

W₁ = W₂ (0.1 m/1.5 m)

W₁ = W₂(0.06667)

using equation (1):

W₁ = (130 N - W₁)(0.06667)

W₁ + 0.06667W₁ = 8.6667 N

W₁ = 8.12 N

Answer:

Dalton's atomic theory proposed that all matter was composed of atoms, indivisible  and indestructible building blocks. while all atoms of an element were indentical  , different  element had atoms  of differing size and mass.

Explanation:

hope it's helpful

Answer:

water can be used as displacement to calculate the volume of a solid object.

Answer: If the object has an irregular shape , the volume can be measured using a displacement can . The displacement can is filled with water above a narrow spout and allowed to drain until the water is level with the spout. As the irregular object is lowered into the displacement can, the water level rises.

Explanation: google

Answer:

both drivers experience the same force. just with different "results"

Explanation:

Answer:

You do

Explanation:

Momentum is mass*velocity. So Newton's 3rd law equal and opposite reaction. Because you weigh less you will have more force act on you than the driver who weighs more.

Answer:

You may be saving someone from a rock slide, where the rocks will fall at any time, before they fall they have potential energy.

Explanation:

Answer:

x = 302 m

Explanation:

Given that,

Speed of an airplane, v = 40 m/s

Height, h = 280 m

40 m/s is the horizontal velocity we should use to solve the given problem.

Let t is the time when the hay will reach the ground. It can be calculated using second equation of motion as follows :

[tex]h=ut+\dfrac{1}{2}at^2[/tex]

Here, u = 0 and a = g

[tex]h=\dfrac{1}{2}gt^2\\\\t=\sqrt{\dfrac{2h}{g}} \\\\t=\sqrt{\dfrac{2\times 280}{9.8}} \\\\=7.55\ s[/tex]

Let the horizontal distance is x. It can be calculated as :

x = vt

x = 40 m/s × (7.55 s)

x = 302 m

Hence, at a distance of 302 m she have to release the hay in order to hit the cow.

Answer:

Explanation:

Changing states of matter and energy

A block of ice is solid water. When heat (a form of energy) is added, the ice melts into liquid water. If heat is removed from water vapour, the gas cools down and it condenses back into liquid water. Continue to cool the water (by removing heat), and it becomes solid ice.

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Answer:

i think it is 1,800

Explanation:

Answer:

With??

Explanation:

Answer:

t = 7200.07seconds or 2 hours

Explanation:

given:

velocity (v) : 80km/h = 80 × 1000 m/ 60 × 60 s

= 80,000m/3600s => 22.222m/s

distance(d) = 160km => 160 × 1000 = 160,000m

time(t) = ?

since v=d/t

therefore, t= d/v

t= 160,000/22.222

t= 7,200.07seconds

or t= 7,200/3600 = 2 hours.

Answer:

mutualism

Explanation:

Mutualism, a relationship in which both species benefit, is common in nature. In microbiology, there are many examples of mutualistic bacteria in the gut that aid digestion in both humans and animals.

Answer:

dx = - 0.0789[m]

Explanation:

In order to solve this problem, we must remember that the vertical component of a vector can be determined using the opposite catheter of the right triangle, by means of the sine function.

[tex]d_{x}=0.250*sin(18.4)\\d_{x} = 0.0789 [m][/tex]

Since the component is directed down, the sign is negative.

dx = - 0.0789[m]

Answer: Uniform Velocity-A body is said to have uniform velocity if it covers equal distance in equal intervals of time in a particular direction, however, the time intervals may be small. ... Examples of the body moving with variable velocity: 1.

Explanation:

Answer:

40watts

Explanation:

Given parameters:

Work done  = 3000J

Time  = 75s

Unknown:

Power generated  = ?

Solution:

Power is the rate at which work is done;

       Power = [tex]\frac{work done}{time}[/tex]

 Now, insert the parameters and solve;

     Power = [tex]\frac{3000}{75}[/tex]   = 40watts

Answer:

19.80 m/s

Explanation

you just multiply the acceleration of gravity by the amount of time since it was let go of. So you get: velocity = 19. 80 m/s^2 * time, or V = gt. The negative sign just means that the object is moving downwards.

These options are missing in the question

(a) Normal force

(b) Gravity force

(c) Applied force

(d) Friction force

(e) Tension force

(f) Air tension

Answer:

(b) Gravity force

(e) Tension force

(f) Air resistance

Explanation:

Normal force: NO, Normal force acts when body surfaces are in contact to push each other since lift is hanging and no surface contact is there so no Normal force.

Gravity force: YES. This force is acted on each and every body that lies in the vicinity of earth's gravitational field, as the life is hanging so it will experience Gravity force.

Applied force: NO.as there is no force given to the Elevator.

Friction force: NO. Friction fore occurs when bodies rub against each other or has a surface of contact, lift do not touch any surface hence no Frictional force.

Tension force: YES. The Elevator is hanging with the support of Four ropes and tension is acting in these ropes.

Air resistance: YES. The Elevator will experience Air resistance as it will move through the wide shaft.

Answer:

f=ma

mass of box =7kg

Explanation:

Answer:

Identify the formula to calculate velocity.

Explanation:

Sorry I have no explanation.

:(

But hope this helps!!!

Answer: You would divide the kids up by how much they weighed in mass until you would get and equal weight for both teams so the tug of war match would be equal.

Explanation:

Since the goal is to have equal teams, the kids would be divided based on their weights until both teams have equal weight.

There are three Newton's law of motion. The first law is that an object will not alter its motion unless there's a force that acts on it.

In the second law,  an object's force equals the mass multiplied by the acceleration. The third law explains that when there is an interaction between two objects, forces are applied.

Since there are 11 people participating and the person wants equal teams, the kids would be divided based on their weights. This is to ensure that the total weights for both teams are the same.

Read related link on:

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Answer:

The maximum voltage that can be applied without damaging the resistor is 4.85 V

Explanation:

Electric Power in a Resistor

Given a resistor or resistance R connected to a circuit of voltage V carrying a current I. The relation between these three magnitudes is given by Ohm's Law:

V = R.I

The dissipated power P of a resistor can be calculated by the following equation, known as Joule's first law:

[tex]P = I^2.R[/tex]

Solving the first equation for I:

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

Substituting in the second equation:

[tex]\displaystyle P=\frac{V^2}{R^2}.R[/tex]

Simplifying:

[tex]\displaystyle P=\frac{V^2}{R}[/tex]

Solving for V:

[tex]V=\sqrt{P.R}[/tex]

The resistor has a resistance of R=47Ω and can hold a maximum power of P=0.5 W, thus the maximum voltage is:

[tex]V=\sqrt{0.5\cdot 47}[/tex]

[tex]V=\sqrt{23.5}[/tex]

V = 4.85 V

The maximum voltage that can be applied without damaging the resistor is 4.85 V

Answer:

Oil

Explanation:

The oil will lose heat more quickly compared to water. This is because oil has a lower specific heat capacity compared to water.

Answer:

5850N

Explanation:

Given parameters:

Mass of the car  = 750kg

Acceleration = 7.8m/s²

Unknown:

Net force  = ?

Solution:

According to Newton's second law of motion;

  Force  = mass x acceleration

To find the net force input the given parameters:

   Net force on the car  = 750 x 7.8  = 5850N

Answer:

THANK YOUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU

Explanation:

I REALLY NEED THIS

Answer:

Oh my gosh yayyy one of the asnwers got deleted!!!! Yay thx for the points

Explanation:

Answer:

Explanation:

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