The period of the sound waves produced by the motor is 8.3 milliseconds.
Calculate the frequency of the sound waves.

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:

11.3 g/cm^3

Explanation:

density = mass/volume

volume of rectangular prism = length * width * height

volume = (4.50 cm)(5.20 cm)(6.00 cm) = 140.4 cm^3

mass = 1587 g

density = (1587 g)/(140.4 cm^3)

density = 11.3 g/cm^3

Answer:

supernova

Explanation:

Answer:

8N -6N = 2N

Explanation:

opposite forces

Answer:

2N backward

Explanation:

6 - 8 = -2

because there is more force backwards than forwards

Answer:

The answer to this question is C.

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:

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:

The answer would be C. 8 N

Explanation:

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:

star

Explanation:

because that is what our sun is.

Answer:

has any one finished the lab yet?????

Explanation:

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:

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

Explanation:

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

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:

Approximately [tex]10\; \rm m \cdot s^{-1}[/tex] at [tex]5.6^\circ[/tex] below the horizon.

(Assumption: air resistance on the ball is negligible; [tex]g = 9.81\; \rm m \cdot s^{-2}[/tex].)

Explanation:

Assume that the air resistance on the ball is negligible. The horizontal component of the velocity of the ball would stay the same at [tex]10\; \rm m \cdot s^{-1}[/tex] until the ball reaches the ground.

On the other hand, the vertical component of the ball would increase (downwards) at a rate of [tex]g = 9.81\; \rm m\cdot s^{-2}[/tex] (where [tex]g[/tex] is the acceleration due to gravity.) In [tex]0.1\; \rm s[/tex], the vertical component of the velocity of this ball would have increased by [tex]9.81\; \rm m \cdot s^{-2} \times 0.10\; \rm s = 0.981\; \rm m \cdot s^{-1}[/tex].

However, right after the ball rolled off the edge of the table, the vertical component of the velocity of this ball was [tex]0\; \rm m\cdot s^{-1}[/tex]. Hence, [tex]0.10\; \rm s[/tex] after the ball rolled off the table, the vertical component of the velocity of this ball would be [tex]0\; \rm m \cdot s^{-1} + 0.981\; \rm m\cdot s^{-1} = 0.981\; \rm m \cdot s^{-1}[/tex].

Calculate the magnitude of the velocity of this ball. Let [tex]v_{x}[/tex] and [tex]v_{y}[/tex] and denote the horizontal and vertical component of the velocity of this ball, respectively. The magnitude of the velocity of this ball would be [tex]\displaystyle \sqrt{{v_x}^{2} + {v_y}^{2}}[/tex].

At [tex]0.10\; \rm s[/tex] after the ball rolled off the table, [tex]v_x = 10\; \rm m \cdot s^{-1}[/tex] while [tex]v_y = 0.981\; \rm m \cdot s^{-1}[/tex]. Calculate the magnitude of the velocity of the ball at this moment:

[tex]\begin{aligned} \| v \| &= \sqrt{{v_x}^{2} + {v_y}^{2}} \\ &= \sqrt{\left(10\; \rm m \cdot s^{-1}\right)^{2} + \left(0.981\; \rm m \cdot s^{-1}\right)^{2}} \\ &\approx 10.0\; \rm m\cdot s^{-1}\end{aligned}[/tex].

Calculate the angle between the horizon and the velocity of the ball (a vector) at that moment. Let [tex]\theta[/tex] denote that angle.

[tex]\displaystyle \tan \theta = \frac{\text{rise}}{\text{run}}[/tex].

For the vector representing the velocity of this ball:

[tex]\displaystyle \tan \theta = \frac{0.981\; \rm m \cdot s^{-1}}{10\; \rm m \cdot s^{-1}} = 0.0981[/tex].

Calculate the size of this angle:

[tex]\theta = \arctan 0.0981 \approx 5.62^\circ[/tex].

Notice that the vertical component of the velocity of this ball at that moment points downwards (towards the ground.) Hence, the corresponding velocity should point below the horizon.

Answer:

C.

If he is pulled into a current, he should swim toward the shore at a 45-degree angle.

Explanation:

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

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: Longitudinal

Explanation:

Answer:

hi

Explanation:

chemical reaction: Chain reactions. Chain reactions occur in a sequence of steps, in which the product of each step is a... So-called branching chain reactions are a form of chain reaction in which the number of chain carriers increases in each propagation.

Explanation:

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

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:

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:

i can see your question

pls fast

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:

Given =

Current = 3 ampere

Resistance = 5 ohm

Solution =

By Ohm's Law

R = V/I

V = R x I

V = 5 x 3

V = 15 volts. Answer