HELP PLEASE BOYLES LAW

Explanation:

Total workdone force × distance

98×100= 9800J = 9.8kJ

Answer:

Your hands get warm by fire because chemical energy gets converted into heat energy. When the chemical bonds in the wood are released in the air which then mixes with oxygen and emit heat. This is the reason why it is always hot when you go near something that is burning or is up in flames.

Explanation:

Answer:

speed = 12.353 m/s

Explanation:

[tex]speed = \frac{distance}{time} [/tex]

distance = 63 m

time = 5.1 s

substitute the values into the formula

[tex]speed = \frac{63 \: m}{5.1 \: s} [/tex]

speed = 12.353 m/s

Answer:

0.03 A

Explanation:

Answer:

30A

Explanation:

I (current)= p (power) / V (voltage)

I= 6.9*10^3 / 230

I= 30A

Answer:

5) The approximate height is about 80 m. Choice (c)

6) The stone takes about 3 seconds to rise to its maximum height

Explanation:

Free Fall Motion

A free-falling object falls under the sole influence of gravity. Any object that is being acted upon only by the force of gravity is said to be in a state of free fall.

If an object is dropped from rest in a free-falling motion, it falls with a constant acceleration called the gravitational acceleration, which value is [tex]g = 9.8 m/s^2[/tex].

The distance traveled by a dropped object is:

[tex]\displaystyle y=\frac{gt^2}{2}[/tex]

Question 5

Given the stone reaches the ground in t=4 seconds, the height of the tower is:

[tex]\displaystyle y=\frac{9.8*4^2}{2}=78.4\ m[/tex]

The approximate height is about 80 m. Choice (c)

Question 6

Vertical Motion

The vertical motion of an object is controlled by the force of gravity. This means that there is a non-zero net force acting on the object that makes it accelerate downwards.

If the object is thrown upwards at speed vo, its speed at time t is:

[tex]v_f=v_o-g.t[/tex]

The stone reaches its maximum height when the final speed is zero, thus:

[tex]v_o-g.t=0[/tex]

Solving for t:

[tex]\displaystyle t=\frac{v_o}{g}[/tex]

The stone is thrown vertically upwards with vo=30 m/s, thus:

[tex]\displaystyle t=\frac{30}{9.8}[/tex]

[tex]t=3.06\ s[/tex]

[tex]t\approx 3\ s[/tex]

The stone takes about 3 seconds to rise to its maximum height

Answer:

Nobel gases

Explanation:

Well since Krypton is in a group called the “Noble Gases”, then Krypton is similar to the others; Xenon, Helium, Neon, Argon, and Radon.

Answer:

The frequencies of sounds made by these two types of instruments are different because of the different ways that air will move at a closed or open end of the pipe. Open pipes do not produce superior tone than closed (or stopped) pipes, therefore different types of pipes are used to produce different tonal qualities.

Explanation:

Answer:

980N

100kg

Explanation:

Weight is Mass * Gravity.

For question a, the object with a mass of 100 kg will have a weight of

100 * 9.8 = 980N

For question b, the mass of the object will stay the same, even if it is on the moon. Therefore it is 100kg.

(a). The weight of the object on the Earth is 980 N.

(b). The mass of the object on the moon is 100 kg.

The weight of the object on the earth has been considered to be affected by the Gravitational force as it has been acting on the object.

(a) The weight of the object on Earth can be given by:

Weight = mass [tex]\times[/tex] Gravitational Force

Given, the mass of the object = 100 kg.

The gravitational force = 9.8N

Weight of the object = 100 [tex]\times[/tex] 9.8 N

Weight of the object = 980 N

(b) The mass of the object has been independent of the gravitational force that has been acting on the object.

Thus, the mass of the object on earth = the mass of object on the moon.

The mass of the object on the moon = 100 kg.

For more information about the mass of the object, refer to the link:

https://brainly.com/question/20353971

Answer:

where is the answer choices

Explanation:

Explanation:

gas vibrate and moves freely at high speeds, liquid vibrate, move about, and slide past each other. solid vibrate (jiggle) but generally do not move from place to place

hope it helps you

Answer:

2 reasons because there are not many of them and they have so much energy that it is hard to capture one at all

Answer:

they have a lot of energy that can prove difficult to capture

Explanation:

Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]

m is the mass

v is the velocity

From the question we have

[tex]k = \frac{1}{2} \times 0.046 \times {15.5}^{2} \\ = 0.023 \times 240.25 \\ = 5.52575[/tex]

We have the final answer as

Hope this helps you

Answer:

True

Explanation:

The momentum of the object won't change if it is left alone. However, if it is moved, the momentum will change. It depends on what you are talking about.

Answer:

Efficency = 28%

Explanation:

We have the load has a weight of:

[tex]w =m*g\\w =12*9.81\\w = 117.72 [N][/tex]

Work in physics is defined as the product of force (weight) by distance.

[tex]W=w*d[/tex]

where:

W = work [J]

w = weight = 117.72[N]

d = distance = 5 [m]

[tex]W=117.72*5\\W=588.6[J][/tex]

Now power is defined as the relationship of work at a certain time.

[tex]P=W/t\\[/tex]

where:

P = power [W]

W = work = 588.6[J]

t = time = 30[s]

[tex]P=588.6/30\\P=19.62[W][/tex]

Now the efficiency of a machine is defined as the power output over the power input to the machine. The power input should always be greater than the power output.

[tex]efficency = \frac{Power_{out}}{Power_{in}}\\Efficeny = \frac{19.62}{70} \\Efficency = 0.28\\Efficency = 28%[/tex]

Answer:

500,300

Explanation:

Safety measures on the road can be regarded as activities and precautions that should be taken in order to improve safety on the road which means to reduce risk.

Whenever one is driving with high-beam lights on, one of safety precautions that must taken into consideration is that ;

You must: (a) dim your high beams for oncoming vehicles by the time they are within 500 feet of your vehicle

(b) dim your high beams when the vehicle you are following is within 300 feet.

When you dim the beam, the oncoming vehicle won't be blind, he/she would be able to see clearly. As you are approaching a car with high-beams, look at the right edge of your own lane and use Conner of your eyes to watch the oncoming car to avoid been blind .

Answer:

C

Explanation:

The shorter a wire, the less it will be worn down from moving around, and the thicker the wire, the longer it will last.

Short wires with a wide diameter will be the material utilized to build a circuit with the minimum amount of resistance. Then, C is the right answer.

Electrical devices such as resistance, transistors, capacitors, inductors, and diodes are connected via conductive wires or traces that allow the electric current to pass between them.

A closed-loop system in which electrons can move is called a circuit. Electricity is supplied to the circuit by an electricity source, such as a battery. No electrons will travel till the circuit is finished, that is, it goes full round back to the electricity source.

A student wants to build a simple circuit.

The material would be used to design a circuit with the least amount of resistance will be short wires with a large diameter. Then the correct option is C.

More about the circuit link is given below.

https://brainly.com/question/12608516

#SPJ6

Answer: Velocity is both magnitude and direction. Formula: d(distance)/t(total time)

Answer:

We know that the period of a pendulum is written as:

T = 2*pi*√(L/g)

where:

g = gravitational acceleration = 9.8m/s^2

pi = 3.1415...

L =  length of the pendulum, in this case, is the length of the brass pendulum.

Now, we know that the brass dilates when the temperature increases.

Then if the temperature increases, the value of L will increase, which means that the period T will also increase, because L is in the numerator of T.

If the period increases the complete motion of the pendulum needs more time, this would mean that the clock will run slower.

If the temperature decreases, the opposite occurs, the value of L decreases, and then the period also decreases, which means that the clock will run faster.

Answer:

I would say A.

Explanation:

Homeostasis is pretty much a state of rest or equilibrium. Only A counts, as that wolf is trying to catch its breath and lower its breathing rate and heart rate.

(I could be wrong if B counts. Ya know, if the spider needs to stop being hungry?)

Answer:

The extension is directly proportional to the force exerted by the weight on the spring.

Explanation:

When the weight is suspended to a spring , the spring is extended through a length say x cm . This displacement is directly proportional to the force exerted on the spring equal to its weight.

Mathematically

F ∝ -x

F= -kx

where x is the displacement of the spring and k is the spring's constant whose value depends on the stiffness of the spring. F is the force exerted by the weight on the spring.

If more weight is added the extension will be greater . If less weight / force is applied the extension in the spring will be less.

Answer:

a

Explanation:cuz i saiad so

Answer:

See the answers below.

Explanation:

The magnitude can be easily found by means of the Pythagorean theorem.

[tex]C = \sqrt{(C_{x})^{2} +(C_{y})^{2}} \\C=\sqrt{(105)^{2} +(88.2)^{2} } \\C=\sqrt{18804.24}\\C = 137.13 [m][/tex]

We know that the coordinates in x and in y are negative, therefore the vector should be located in the fourth quadrant, see attached image.

And the angle with respect to the horizontal can be determined by means of the tangent of the angle.

[tex]tan(\alpha )=\frac{88.2}{105}\\tan(\alpha ) =0.84\\\alpha =tan^{-1} (0.84)\\\alpha =40[/tex]

These are 40 degrees below the X-positive horizontal axis.

Answer:

137.13

Explanation:

I got it right on Acellus

Answer:

t= (20, 25, ...  40) s

Explanation:

This is an exercise in kinematics specifically of uniform motion, the first thing we must do is set a reference system, we place our zero in the police car, we write the equations

police car

         x₁ = v₁ t

truck

         x₂ = x₀ + v₂ t

In this case, they indicate several initial positions of the truck and the speed of the two vehicles, at the meeting point the positions must be the same

         x₁ = x₂

        v₁ t = x₀ + v₂ t

        t (v₁ - v₂) = x₀

        t = [tex]\frac{x_{o} }{v_{1}- v_{2} }[/tex]

let's calculate for each initial position

x₀ = 80m

      t = 80 / (25-21)

      t = 80/4

      t = 20 s

x₀ = 100 m

      t = 100/4

      t = 25 s

the last x₀ = 160 m

      t = 160/4

      t = 40 s

we can see that the time increases as the distance between the vehicles increases

Answer:

Explanation:

m = 55 kg

a = 9.8

F = ?

The first thing you are going to do is find the force that the girl represents.

F = 9.81 * 55

F = 539.55

But that is not the answer. That is her weight. A very important part of this question is to realize that the floor is pushing up on her with an equal force.

Her weight is going DOWN.

The floor is pushing UP with a force of 539.55 Newtons.

Answer: It will amount to 11p after 20 years.

Explanation:

Formula :

Simple interest = Principal x rate x Time              (i)

Amount = Principal + Interest

Amount = Principal +   Principal x rate x Time

Amount =  Principal (1+  rate x Time)                       (ii)

Given: Principal = p

After 1 year , amount = 1.5p

After 3 years , amount = 2.5p

From (ii)

[tex]1.5p = p (1+r)\\\\\Rightarrow\ 1.5=1+r\\\\\Rightarrow\ 0.5= r\\\\\Rightarrow r= 0.5[/tex]

Amount after 20 years = p(1+ 0.5 x 20) = p(1+10)=11p

It will amount to 11p after 20 years.

Answer:

False

Explanation:

Density is an intensive property of a substance. Intensive properties are those properties that are characteristic of a substance. They do not depend on the amount of substance present.

Since density is an intensive property, each piece of sulphur still has a density of 2g/cm3.

Answer:

120 Newtons

Explanation:

m = 20 kg

a = 6 m/s

F = ?

F = m x a

F = 20 x 6

F = 120 Newtons