Plz help in this question.

Answer:

A

Explanation:

Can read mass precisely, commonly reading error of +0.05g

Mass is a measure of the amount of matter in a substance.  Mass can be measured using a triple beam balance. Hence option (A) is correct.

In physics, mass is a quantitative measurement of inertia, a basic characteristic of all matter. It essentially refers to a body of matter's resistance to changing its speed or location in response to the application of a force. The change caused by an applied force is smaller the more mass a body has. The kilograms serves as the unit of mass in the International System of Units (SI).

The conservation of mass principle states that no matter how an object's component pieces are rearranged, the object's overall mass remains constant. If a body splits into parts, the mass also splits into pieces, therefore the original mass is equal to the sum of the masses of the individual fragments. Alternatively, if two or more particles are combined, the mass of the resulting composite equals the total of the masses of the individual particles. This rule is not always accurate, though.

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Answer:

you need to multiply them and then you have your answer eg = 810 × 6.7 = 5427kg

Resultant force would accelerate an 810 kg mass at 6.7 m/s² 5427 N

A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

Given in the question,

Acceleration (a) = 6.7 m/s²

Mass (m) = 810 kg

Force (F) = ?

We know

F = M * a

F = 810 * 6.7

F = 5427 N

Resultant force would accelerate an 810 kg mass at 6.7 m/s² 5427 N

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Answer:

Landforms affect where people build houses and communities. Many people live on plains because it is easy to travel and to farm on flat land. Other people live in valleys, which are the land between mountains or hills. The soil in valleys is good for farming.

Answer: lake

Explanation: it would almost always be cool. And cool things are inside!

Answer:

i can see your question

pls fast

Answer:

14:30:00

Explanation:

because the speed of propagation of seismic waves is at 500

Answer:

supernova

Explanation:

Answer: vf= 86.24

Explanation:

Basic physics kinematic problem right. So we assume if this is freefall the object or cup in this case is falling with an initial speed of zero and then starts to accelerate due to the force of gravity. First lets see what equations we should use:

Imma use

d=vi+vf/2*t

d=vi*t+ 1/2*a*t^2

First I will solve for distance just to make it easier for me to use the equations.

d= 0(initial speed)*8.8s+1/2*(9.8m/s^2)(8.8)^2 or just d=1/2*(9.8m/s^2)(8.8)^2

d= 379.456

Alright lets use this info in the next equation

379.456= 0 + vf / 2 *8.8 or  379.456= vf/2 *8.8= vf= 86.24m/s

Answer:

8N -6N = 2N

Explanation:

opposite forces

Answer:

2N backward

Explanation:

6 - 8 = -2

because there is more force backwards than forwards

Answer:

[tex]given \: \\ mass \: (m) = 50g \\ kinetic \: enegy \: (k.e) = 25kj \\ velocity(v) = x \\ form \\ k.e = \frac{1}{2} \times MV ^{2} \\ 25 = \frac{1}{2} \times 50 \times v {}^{2} \\ 25 = 25 \times v {}^{2} \\ v {}^{2} = \frac{25}{25} \\ v {}^{2} = 1 \\ v = \sqrt{1} \\ v = 1ms {}^{ - } [/tex]

the car it go fast with velocity 1m/s

Explanation:

a part of the kinetic energy of the sun is converted into heat as it cuts the log of wood it is due to this heat that becomes worm .Thus, kinetic energy of such changes into heat

Answer:

Energy = 6400000 Joules

Explanation:

Given the following data;

Mass = 100kg

Radius of earth = 6400 km

To find the amount of energy required by the object to escape the velocity of the earth, we would apply the Law of Conservation of Energy.

This law states that energy cannot be destroyed but can only be converted or transformed from one form to another. Therefore, the sum of the initial kinetic energy and potential energy is equal to the sum of the final kinetic energy and potential energy.

Mathematically, it is given by the formula;

Ki + Ui = Kf + Uf .......equation 1

Where;

Ki and Kf are the initial and final kinetic energy respectively.

Ui and Uf are the initial and final potential energy respectively.

At the earth surface, potential energy with respect to the radius of the earth is given by the formula;

[tex] Ui = - \frac {GM}{R} [/tex] ......equation 2.

Also, at the earth surface, kinetic energy is given by the formula;

[tex] K.E = \frac{1}{2}MV^{2}[/tex] .......equation 3.

After escaping the earth, the object wouldn't have both kinetic and potential energy; Kf = Uf = 0

Substituting eqn 2 & 3 into eqn 1, we have;

[tex] \frac{1}{2}MV^{2} - \frac {GM}{R} = 0 [/tex]

[tex] \frac{1}{2}MV^{2} = \frac {GM}{R} [/tex]

Making "V" the subject of formula;

[tex] RMV^{2} = 2GM [/tex]

[tex] V^{2} = \frac {2GM}{RM} [/tex]

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

Therefore, energy = gmR

Energy = 10 * 100 * 6400

Energy = 6400000 Joules

Explanation:

Is this ok?......I have got the answer in pascals.

Answer: Longitudinal

Explanation:

Answer:

It will take 3.5s to reach the ground

Explanation:

Answer:

The mass of the locomotive is 288,000 kg

Explanation:

The question relates to the law of conservation of energy

The given parameters are;

The form of engine on the locomotive = Rocket engine

The mass of the locomotive = m

The initial velocity of the locomotive, v = 0 m/s

The duration at which the engine is fired = 20 s

The mass of the kerosene expelled, m₁ = 500 kg

The average speed with which the kerosene is expelled, v₁ = 1,200 m/s

The final speed of the locomotive engine after 20-s, v₂ = 50 m/s

Kinetic energy, K.E. = 1/2·m·v²

The total kinetic energy of the kerosene particles, K.E.[tex]_k[/tex] = 1/2 × 500 × 1,200² = 360,000,000

∴ K.E.[tex]_k[/tex] = 360,000,000 J

By the conservation of energy, the kinetic energy of the expelled kerosene particles is equal to the kinetic energy gained by the moving locomotive

Therefore, we have;

K.E.[tex]_L[/tex] = K.E.[tex]_k[/tex]

K.E.[tex]_L[/tex] = 1/2 × m × v₂² = 1/2 × m × 50²

∴ K.E.[tex]_L[/tex] = 1/2 × m × 50² = K.E.[tex]_k[/tex] = 360,000,000 J

1/2 × m × 50² = 360,000,000 J

m = 360,000,000 J/(1/2 × (50 m/s)²) = 288,000 kg

m = 288,000 kg

The mass of the locomotive, m = 288,000 kg

Answer:

Percentage of mass converted to energy = 99.9 %

Explanation:

By far most of the solar system's mass is in the Sun itself: somewhere between 99.8 and 99.9 percent. The rest is split between the planets and their satellites, and the comets and asteroids and the dust and gas surrounding our star. Seen from afar (on the scale of distances between stars) the presence of the solar system would not be obvious. We would simply see a normal-looking star. Perhaps we would pick up the presence of Jupiter, which makes up two thirds or so of the solar system outside of the Sun, by mass.

Answer:

weight on earth is mg

which is 5*9.8

49 Newton

weight on moon is 1/6 th of weight on earth

1/6*49

8.166 Newton..

Answer:

1

For instance, on Earth, a 5.0-kg object weighs 49 N; on the Moon, where g is 1.67 m/s2, the object weighs 8.4 N.

2

The weight of the object on the surface of earth would be 5kg. The weight of the object on the surface of moon would be 5/6= 0.83 as the weight of any object on earth is six times than that on moon.

Answer:

Explanation:

Longitudinal

The medium moves in the same direction of the wave

It acts in one dimension

The wave cannot be polarized or aligned

This wave can be produced in any medium such as gas, liquid or solid

The earthquake P wave is an example

It is made of rarefactions and compressions

Transverse

The medium is moving perpendicular to the direction of wave

It acts in two dimension

The wave can be polarized or aligned

This wave can be produced in solid and liquid’s surface

Earthquake S wave is an example

It is made of troughs and crests

Answer:

The light energy from the sun causes the particles of the object to vibrate, transforming the light energy into heat energy. The heat energy is then radiated out as infrared light.

Explanation:

Answer:

The answer would be C. 8 N

Explanation:

Answer:

a.) Maximum height of the projectile. =32.5m

b.) The time it takes to reach the maximum height=2.6s

c.) Time of flight=2.6s

d.) Range=99.5m

Explanation:

Answer:

20watts

Explanation:

Formula for calculating power is expressed as;

Power = Work done/Time

Note that the unit of workdone is Joules

Unit of Time is seconds

Hence the unit of power is Joules/seconds or J/s

Hence if the rate at which energy is used up is 20.0J/s, the power will also be 20J/s or 20watts since they have the same unit.

Answer:

The combination of all of the forces acting on an object is called D. net force

Explanation:

Answer:

The answer to this question is C.

Answer:

to prevent the derailing of the train due to thermal expansion.

Answer:

Iron are good conductors of heat and electricity. Being a good conductor it expands as well as contracts with the change of temperature.When heat is applied,they expands because molecules inside the element gets excited and number of molecules inside it increases in tremendous amount,so it leads to expansion of iron. So when the temperature is lowered it comes in its normal state.

The term for this is called as thermal expansion or contraction.The gap in the joint between 2 rails is to prevent from the expansion of the iron. It is necessary ,if not there will be change in structure,it may buckle and chance of derailed is increased.

Explanation:

The gap in the joint between to rails is to compensate for the expansion of the material of rail during summer.

The metals expand or contract with the changes in temperature. The expansion or contraction depends on the coefficient of thermal expansion of the material. Based on this property of the metal, the gap in the joint of two rails is provided.

Answer: because the air currents move upwards so the hot air fills up the whole room. Similarly if the air conditioner is placed neer the ceiling because it gives cool air

Answer:

6km/hr

Explanation:

Lets make a chart

   R.                                G

D  6km.                   6 /2=3km

S.  6/1/1= 12 km/h.    6km/h= 3/1/2  

T  1/2hr                       1/2hr

so 6km/hr hope that helps if it does please mark as brainliest.