A compound pulley is a type of system. How does a system work?

Answer: D

Explanation:

Answer:Visible light is a small part of the electromagnetic spectrum. The spectrum covers everything from gamma rays, x-rays, visible light, infrared, microwave and radio waves. Each part of the spectrum, including the different colors of visible light, have different wavelengths (the space between each wave).

Explanation:

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as for the production of biomass energy wood is mostly used source and burning of wood for the production of biomass energy can lead to the risk of deforestation in the future and emissions of carbons, pollute the surrounding. Thus this is the reason biomass energy might not be a good alternative energy source.

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Answer:

the constant force applied by Kitty is 8 N.

Explanation:

Given;

work done by Kitty, W = 32 J

distance moved by Kitty's trolley, d = 4 m

Let the constant force applied by Kitty = F

The work done by Kitty is calculated as follows;

W = F x d

F = W / d

F = 32 / 4

F = 8 N.

Therefore, the constant force applied by Kitty is 8 N.

Explanation:

beacuse light is mixture of many different colours,each with different frequency

Answer:

1

Explanation:

4+5 =9

5n to the right

Answer:

the answer is c

Explanation:

by transferring heat from the tropics to the colder climates

The statement which best describes how the ocean convection cycle impacts different climates is by transferring heat from the tropics to the colder climates. Thus, the correct option for this question is C.

The ocean convection cycle may be characterized as a type of methodology through which the mesoscale ocean circulation and large, strong winds mix layers of water at different depths.

During this cycle, when one part of a fluid is heated, the temperature difference causes by transferring heat from the tropics to the colder climates fluid to move in a current or defined direction. As the heated fluid rises, it is replaced by a cooler fluid, which is sometimes referred to as a convection cycle.

Therefore, transferring heat from the tropics to the colder climates is the process that best describes how the ocean convection cycle impacts different climates. Thus, the correct option for this question is C.

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Answer:

The point at which rays or waves meet after reflection or refraction, or the point from which diverging rays or waves appear to proceed is called focal point

Answer:

b

Explanation:

if it's over land and in polar region it's B

Answer:D

Explanation:

trust me

Answer:

The kinetic energy is 16 joules.                        

Explanation:

Kinetic energy (E) is given by:

[tex] E = \frac{1}{2}mv^{2} [/tex]

Where:

m: is the mass

v: is the speed

When the kinetic energy is 4 joules, the speed of the object is:

[tex] v_{1}^{2} = \frac{2E_{1}}{m} = \frac{8}{m} [/tex]                         

Now, if the speed is increased twice then we have:

[tex] E_{2} = \frac{1}{2}mv_{2}^{2} = \frac{1}{2}m(2v_{1})^{2} = \frac{1}{2}m[4(\frac{8}{m})] = 16 J [/tex]

Therefore, the kinetic energy is 4 times the initial value.  

I hope it helps you!                                

Answer:

8 seconds

Explanation:

From Newton's second law;

Ft = m(v-u)

F = Force applied

t = time taken

v = final velocity

u  = initial velocity

20 * t = 32 (9 - 4)

20t = 32 * 5

t = 32 * 5/ 20

t = 8 seconds

Answer:

B. Not

C. Positively

A. Attraction

Answer:

so basically

Explanation:

ty for the free points tho ez ez ez ez jajjajajajajajjajaj ez ez ez free cash dog water

Answer:

Statement:

The electric current passing through a conductor is directly proportional to the potential difference across its ends provided temperature and other physical conditions remain constant.

Explanation:

Current is directly proportional to voltage loss through a resistor. That is, if the current doubles, then so does the voltage. To make a current flow through a resistance there must be a voltage across that resistance. Ohm's Law shows the relationship between the voltage (V), current (I) and resistance (R).

V∝I or I∝V⇒V=IR.

Explanation:

Ohm's law states that the current through a conductor is proportional to the voltage across the conductor. This is true for many materials (including metals) provided the temperature (and other physical factors) remain constant. The constant of proportionality, R,R is the resistance and the unit is the ohm, with symbol \Omega,Ω. The relationship can be written as:

V, equals, I, R.

V=IR

where V,V is the voltage across the conductor and I,I is the current flowing through it. If a component is ohmic (it obeys Ohm's Law), then its resistance must be independent of current and voltage.

Answer:

Hope this helps!

Explanation:

As an object falls, it picks up speed. The increase in speed leads to an increase in the amount of air resistance. Eventually, the force of air resistance becomes large enough to balances the force of gravity. At this instant in time, the net force is 0 Newton; the object will stop accelerating. An object falling toward earth stop accelerating when it velocity becomes terminal velocity. Or When weight becomes equal to Drag force acting on the object due to air resistance.

Answer:

read this it might help some

When a moving object collides with a stationary object of identical mass, the stationary object encounters the greater collision force. When a moving object collides with a stationary object of identical mass, the stationary object encounters the greater momentum change.

Explanation:

Answer:D increases

Explanation:

When sound travels from air into glass, speed of a sound wave increases. Hence option D is correct.

Wave is a disturbance in a medium that carries energy as well as momentum . wave is characterized by amplitude, wavelength and phase. Amplitude is the greatest distance that the particles are vibrating. especially a sound or radio wave, moves up and down.

Amplitude is a measure of loudness of a sound wave. More amplitude means more loud is the sound wave.

Wavelength is the distance between two points on the wave which are in same phase.

Phase is the position of a wave at a point at time t on a waveform.

speed of the sound is greatest in solid and it is medium in liquid and lowest in gaseous state.

In this problem sound wave is going from air to glass, it is actually going from gaseous to solid state, as speed of sound is greatest in the solid, speed of the sound increases to 5.640 m/s.

Hence option D is correct.

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Answer:

60m/s

Explanation:

since the object is falling under the influence of gravity, the formula is

v = u +gt

before the fall, the object is at rest then

u = 0m/s

v = 0 + 10×6 because acceleration due to gravity is g which is given as 10m/s2

therefore, v = 60m/s

Answer:

c

Explanation:

Answer:

Number of protons and atomic number

Explanation:

Explanation:

Mass =150g = 0.15kg

Volume= 35cm^3 = 0.35m^3

Density= Mass×Volume

= 0.15kg × 0.35m^3

= 0.05 kg m^3

Answer:

FALSE

Explanation:

To answer this question we must clarify that for a given approach to exist there must be a transition between two atomic levels of the material.

For the emission, the transition between two determined states must also occur, therefore the radiation emitted is equal to that absorbed.

Consequently the statement is False

Answer:

84 kgm/s

Explanation:

mvf - mvi = impulse

(14kg)(6m/s) - (14kg)(0m/s) = 84 kgm/s

Answer:

negative particles

Explanation:

An atom can be defined as the smallest unit comprising of matter that forms all chemical elements. Thus, atoms are basically the building blocks of matters and as such defines the structure of a chemical element.

Generally, these atoms are typically made up of three distinct particles and these are protons, neutrons and electrons.

In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.

Valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others. Thus, this property is typically used to determine the chemical properties of elements.

Hence, an object is most likely to become electrically charged by gaining or losing negative particles.

Answer:

At B

Explanation:

If it's placed on place B as soon as the cold water arrived it will have time to heat. Hope this helps and best of luck

Answer:

1: 2

2: 5

Explanation:

hope this helps <3