Need help, please! : )

Answer:

i think it is 0.06 but im not sure sorry if im wrong

Explanation:

When a substance freezes, its atoms become locked in place so they do not move from one position to another. Therefore, any substance that is frozen is a solid. Hence, option (D) is correct.

One of the four basic states of matter is solid (the others being liquid, gas, and plasma). The least solid molecules are those that are tightly packed together and make up solids.

A solid is distinguished by its structural rigidity and resistance to external forces. A solid substance, unlike a liquid, does not flow to conform to the shape of its container or, like a gas, expand to cover the entire space. A solid's atoms are connected to one another either in a regular geometric lattice (such as that found in metals and common ice), or in an asymmetrical manner (an amorphous solid such as common window glass).

Therefore, any substance that is frozen is a solid.

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Explanation:

back ground radiation is a natural radiation so basically everything emits background radiation. so if it were harmful, the world wouldn't be here,

so it is false

it knocks electrons out of atoms, this is because ionising radiation is a radiation that had enough energy to remove electrons form the atoms and molecules.

true because exposure to radon can damage biological molecules such as proteins, which leads to abnormal patterns of cell division, which leads to cancer.

hope it is helpful, if not , you can report and let someone else try it out.

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Answer:

it's A

Explanation:

it's A because the ph level of water is just the level of the water if it's acidic or just a base

Answer:

please find attached file

Explanation:

Answer:

Explanation:

Remark

Let's start with the second question first. If the two forces aren't balanced, the truck will move in some direction. So the downward force of the truck must equal the upward force provided by the pavement pushing up.

Mass of truck = 9500 kg. Remember mass is directionless and it is not a force or weight. That truck would have a mass of 9500 kg anywhere in the universe.

Givens

m = 9500

a = 9.8

Force or weight = ?

Formula and Solution

F = m * a

F = 9500 * 9.8

F = 93100 N

Comment

That force does have a direction. It is down.

The balancing force (you call it the reaction force) going upward is 93100 N

Answer:

3.5 A

Explanation:

Current [A] =Electrical power [W] ÷ Potential difference [V]

KW TO W = ×1000

hence,

800W÷230V= 3.5A (1 d.p)

The current through a television with a power of 0.8kW if it uses 230V mains supply is 3.5A

Current is as a result of the flow of electrons through a conductor.

Voltage is the difference in potential between two points.

Power is the product of current and voltage. It is given by:

Power(P) = Current(I) * Voltage(V)

Given a power of 0.8 kW = 800W, V = 230 V. Hence:

P = IV

800 = 230I

I = 3.5A

The current through a television with a power of 0.8kW if it uses 230V mains supply is 3.5A

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Answer:

Input work is the work done on a machine as the input force acts through the input distance. This is in contrast to output work which is a force that is applied by the body or system to something else. Output work is the work done by a machine as the output force acts through the output distance, hope that helped

.

Explanation:

Answer:

:Meterology, Seismology,

Answer:

•Walking briskly

• Running /jogging

•Dancing

•biking

Answer:

1000kg

Explanation:

We can use the equation "p=mv"

If we rearrange the equation to find mass (m), then the equation becomes:

m=p/v

We can substitute in the values of p and v as they are already given in the question.

So, now we just substitute in the values to get our answer.

m=p/v

m=25,000/25

m=1000kg

Acceleration = (change in speed)/(time)

Change in speed = (60-15) = 45 km/hr

Time for the change = 30 sec

Acceleration = 1.5 km/hr-sec

Answer:

Compresion wave  

Explanation:

Answer:

the nearest whole number is 5

Answer:

it would be 3

Explanation:

because you have to divide the length by the height of the incline.

The mechanical advantage of an inclined plane that has a length of 9 feet and a height of 3 feet will be 3.

Mechanical advantage is a measure of the ratio of output force to input force in the system, it is used to obtain the efficiency of a mechanism.

The formula for the mechanical advantage of the inclined plane is found as;

[tex]\rm Mechanical \ advantage = \frac{length}{height} \\\\ Mechanical \ advantage =\frac{9}{3} \\\\ Mechanical \ advantage =3[/tex]

Hence the mechanical advantage of an inclined plane that has a length of 9 feet and a height of 3 feet will be 3.

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Answer:

Thats a lot, good luck!<3

Answer:      

extension at the elbow, abduction of the shoulder

Explanation:

i think thats it im not sure hopefully it helps

Explanation:

incomplete question graph / fig is not available

Answer:

Point x I think

Explanation:

Answer: Gently reduce pressure on brakes – if on ice, push in the clutch to let the wheels turn freely.

Turn the steering wheel quickly – look and steer in the direction you want to go.

Counter-steer – as the vehicle gets back on course, counter-steer to avoid skidding in the opposite direction.

Explanation:

Answer:

L = 1.61 cm

Explanation:

The frequency of open organ pipe is given by :

[tex]f=\dfrac{nv}{2L}[/tex]

Where

n = 1 for fundamental frequency

f = 10500 Hz

L is the length of the pipe

v is the speed of sound, v = 340 m/s

So,

[tex]L=\dfrac{nv}{2f}\\\\L=\dfrac{1\times 340}{2\times 10500 }\\\\L=0.0161\ m\\\\or\\\\L=1.61\ cm[/tex]

So, the length of the pipe is 1.61 cm.

Answer:

0.0163

Explanation:

acellus

Answer:

15kg

Explanation:

Acceleration = 10 m/s^2

Force = 150 N

Force = mass * acceleration

mass = force / acceleration

mass = 150 / 10

mass = 15 kg

1) Newton first law of motion: state“If a body is at rest it reamain at rest and if it is in a motion it continu its motion unless a net external force acting on it”

This law also called law of inertia

2) Newton second law of motion: states that ‟acceleration to the force acting on the body and inversky proportional to the mass of the body”

3) Newton's third law of motion: It is not possible to exert a force abody with out the body exerting a forces in the opposite direction.

These forces are called action and reaction forces

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