NEED HELP ASAP What are the lengths of the x and y components of this vector?

Answer:

Correct option is

B

16dB

Sound level at A is ⊥o⊥B

If the intensity of sound at A 4 cm away from the source is I

A

then.

⊥o=10log

I

o

I

A

Where I

o

=10

−12

w m

−2

⇒⊥=log

10

−12

I

A

⇒

10

−12

I

A

=10

⇒I

A

=10

−11

wm

−2

If the source (s) is emmitting the sound energy of power P

I

A

=

4×(4)

2

P

⇒P=10

−11

×64π w

⇒ Intensity of sound (I

B

) ar point B,2 m

I

B

=

4π(2)

2

P

I

B

=

16π

64π×10

−11

10 m

−2

⇒I

B

=4×10

−11

wm

−2

⇒ Sound level at 2m=10log(

I

I

B )

=10log(10 −12

4×10 −11)

=10log40

=16.02

Hence Sound level at 2m from sourceis 16 dB

Answer:

d) Kilogram.

Mass is measured in

a) Litters

b) Centimeter

c) Newton

d) Kilogram

Answer:

Ventricular Fibrillation

Explanation:

it is measured bpm ( beats per minute ) of the cardiac muscles of the heart in a poor / disorderly working condition.

Answer:

velocity and final velocity (m/s)

Explanation:

Answer:

1. it is universal means of communicating scientific information

2. meter

3. computer, internet, laboratory, and field

The distance traveled by the car will be equal to 400 m.

The given parameter

distance round the block, d = 400 m

To find:

To travel round the block means that the car will complete a distance equal to the distance round the block.

Thus, the distance traveled by the car will be equal to 400 m, since this is equivalent to the distance round the block.

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Answer:

THIS DUE TO THE THIRD LAW OF MOTION.

AS WE PUSH WATER BACKWARD THE WATER WITH SAME FORCE BUT EQUAL DIRECTION PUSHES US SO WE GO IN FORWARD DIRECTION.

Explanation:

While swimming a person pushes water backward because the pushing action create reaction due to which we move forward while swimming.

One minute has 60 seconds, One hour has 60 minutes and one day has 24 hours. Thus, 80 x 60 x 24 = 86,400 sec

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Answer:

[tex]thank \: you[/tex]

Answer:

In plotting position versus time it can be seen that the green line represents  a fixed position at the various times given - the other lines represent changing position with time

The (horizontal) green line describes an object that's not moving.

Whatever TIME you pick to look at the green line, its POSITION is always the same. This is a pretty good description of "not moving".

The other three lines all have different positions at different times, so they all describe motion.

Answer:

(E) it seems like the best option

Explanation:

[tex]thank \: you[/tex]

Religious customers seem to avoid their products because;

When selling a product to potential customers, the brand name of that product could affect sales negatively or positively.

Religious people do not view the devil in a positive manner because they believe that he is responsible for the suffering in the world.

The already existing bias they have in their minds about that name will make them reject any product bearing the name. They might even reason that this medicine will worsen their sickness. For this reason, the medicine called "Devil Red" will have a poor reception by religious people.

Summarily, religious people avid the medicine called Devil Red because they have a negative view of the devil.

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Answer:

Answer:

if there is not motion produced in body, the works become zero. We can do work against gravity or against friction. when we lift something then it is work done against gravity and when we slide something then it is work done against friction.

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Answer:

Fluorescent lamp releases more light energy.

Explanation:

This is so because the fluorescent lamp releases more light energy and less heat energy than that of a filament lamp with the same rating.

Fluorescent lamp releases more light energy than that of filament lamp and also less heat energy than that of a filament lamp.

The filament and the fluorescent lamps are two different types of most commonly used light lamps. The filament lamps are the lamps which work on the phenomenon of incandescent whereas a high resistance filament is heated up in the lamp until it radiates visible light energy. Whereas, a fluorescent lamp is the lamp which works by ionizing a gas that emits photons or energy particles.

The fluorescent lamp releases more light energy and less heat energy than that of a typical filament lamp with the less power of 25W than 50W.

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Answer:

They are invisible!

Explanation:

Explanation:

They are invisible is the answer.

Answer:

Yes we can.

Explanation:

1 Litre= 0.001km

1000 Litre= 1km

Answer:

A) Measuring cup with water and a scale

Explanation:

Fill the measuring cup with water to a certain point, and record the current height of the water. After placing the banana fully into the water, record the new height of the water. Subtract the old height from the new height. Now you have the banana's volume.

Then, place the banana on a scale to get it's mass.

Perform [tex]\rho ={\frac {m}{V}}[/tex], where p = density, m = mass, v = volume.

Note: 1 milliliter = 1 centimeter^3

[tex]\\ \rm\longmapsto Force=Mass(Acceleration)[/tex]

[tex]\\ \rm\longmapsto Force=25(10)[/tex]

[tex]\\ \rm\longmapsto Force=250N[/tex]

Answer:

approximately 0.00504 kWh

Explanation:

This electrical energy and is measured in kWh.

For 5 minutes and 20 seconds of use, it is 0.06 W x 0.084 h = 0.00504 kWh.

Note: 60W = 0.06kW; 5min 20sec = 0.083(8) ≈ 0.084 hour

1) They have valence electrons in the same energy level.

2) Helium atoms have 2 valence electrons, while atoms of the other elements in the group all have 8 valence electrons.

3) cesium (Cs)

4) There are two electrons in the first energy level and seven electrons in the second energy level.

In the periodic table, elements are arranged in order of increasing atomic number into groups and periods.

In the periodic table, we have an arrangement of atoms based on their respective groups and periods.

If I pick two representative elements in the same period, their number of valence electrons will differ by 1 but they will all be accommodated in the same energy level.

Helium is the first member of group 18. Unlike the other members of the group, its first shell is also its valence shell. It has two and not eight valence electrons like other members of the group.

The electronic configuration of Ca is [Ar] 4s², that of Li is [He] 2s1, that of Cs is [Xe] 6s1, that of Br is [Ar] 4s² 3d¹⁰ 4p⁵ and that of oxygen is [He] 2s² 2p⁴.

We can see that only Cs has  valence electrons in higher energy orbitals than those of Ca.

Lastly, Fluorine is in group 17. There are nine electrons in this atoms. They arranged in such a way that there are two electrons in the first shell and seven electrons in the second shell.

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Answer:

Mono-chromatic, Poly-chromatic. When a wave moves from one medium into another at an angle other than 90 degrees the wave will change direction and continue to follow a new straight-line path

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Answer:

[tex]velocity = \frac{speed}{time} \\ = \frac{16}{.25} \\ \frac{16}{ \frac{1}{4} }(.25 = \frac{1}{4}) \\ 16 \times 4 = 64 km/hour\\ thank \: you[/tex]

Explanation:

The object of Ultimate Frisbee is to gain points by scoring goals. The disc may only be passed, and a goal is scored when a player successfully passes the disc to a teammate in the end zone which that team is attacking. The team with the most points at the end of the game is declared the winner.

Answer:

Electromagnetic waves consist of both electric and magnetic field waves. These waves oscillate in perpendicular planes with respect to each other, and are in phase. The creation of all electromagnetic waves begins with an oscillating charged particle, which creates oscillating electric and magnetic fields.

Explanation:

Answer:

Option A because the researcher can change the amount of water given to the plant to determine the dependent factor, how much the plant grows. Options C and D are both control variables that need to stay the same in order to perform this experiment correctly.

Answer:

Experiment

Materials needed

Stop watch, a small stone, a big stone, a balance.

Procedure

Measure the mass of the two stones.

Hold the two stones about 5m above the ground level.

Drop the stones simultaneously.

Record the time taken for the stones to strike the ground.

Repeat the procedure with different masses of objects at the same height.

Observation, it will be observed that, all the objects dropped from the same height strike the ground at the same time interval.

Conclusion; a falling object doesn't depend on mass

Explanation:

½mv²=mgh

g=½(V²/h)

When an object is held at a height, it posses gravitational potential energy which is mgh, where m= mass, h=height, g=acceleration due gravity

When the object is dropped, the potential energy will be converted to kinetic energy which is ½mv², where V=velocity at which the object moves.

V=∆h/t, ∆h is change in height with respect to time.

½mv²=mgh

Mass cancel out,

g=v²/2h

This implies that g does not depend or is not affected by mass. Hence heavy object and light object will reach the ground at the same time when dropped from the same height. When air resistance is negligible.

Answer:

[tex]atomic \: mass \: of \: oxygen = 15.99aproximtly = 16 \\ thank \: you[/tex]

Answer:

The atomic mass of oxygen is 15.999 u.

Answer:

6N

Explanation:

F = m × g

= 0.6 × 10

= 6N

to find the force you first have to convert the mass to kg by dividing 600 by 1000 giving you 0.6

then you can multiply the mass times the gravity giving you a gravitational force of 6N

Explanation:

equator.

because the "belly" of the Earth around the equator makes the Earth there thicker than from pole to pole.

the reason is the spinning of our planet. as the spinning speed is the fastest at the thickest part of a ball (at the equator), that ball has the tendency due to the centrifugal force to extend even further there, and the extra material for that is being pulled in from the poles.

therefore, the diameter through the Earth from equator to equator is larger than the diameter from pole to pole.

and that means that there is more mass from equator to equator than from pole to pole.

and that means that gravity is stronger at the equator.

therefore, a body will fall faster at the equator than on a pole.