21.
Figure 1 shows a person sliding down a zip wire.
Figure 1
Zip wire
Change
in vertical
height
(a) As the person slides down the zip wire, the change in the gravitational potential energy
of the person is 1.47 kJ
Eg=m
The mass of the person is 60 kg
gravitational field strength = 9.8 N/kg
Calculate the change in vertical height of the person.

The capacitance value of a capacitor is measured in farads (F)

The SI unit for capacitance is referred to as Farads.

This is the ability of a device or circuit to store energy which is usually in

the form  of electric charges.

A capacitor on the other hand is the device which performs this function.

The formula for determining capacitance is denoted below:

C = q/V where C is capacitance, q is charges and V is voltage.

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Answer:

Black bodies are good absorber of light waves from the sun, while shining surfaces are good reflector of the light waves.

Explanation:

Generally, a black surface or material tends to absorb light waves while under the sun, while a shiny surface is a good reflector of the waves. This is because the black material is a good absorber, and also a good emitter.

The shiny necklace can only absorb little light waves from the sun, thus it reflects most of the light waves. The reflection is the reason for the small circles of light seen around the yard.

However, when in a cool environment the black shirt would cools faster (good emitter) than the shiny necklace.

Answer:

(a) 180 km

(b) 30km

Explanation:

To find displacement (in this case, kilometers) you need to convert km/h to km, this can be done by multiplying by the amount of hours:

[tex]\frac{60km}{h}*3h=60km*3=180km \\\frac{60km}{h} *h/2 = 60km/2=30km[/tex]

(The h/2 term came from 1/2*h, since half an hour is h*1/2)

Answer:

D :)

Explanation:

When an impact causes the car to suddenly change its motion, (D) the people in the car will continue to move in the same direction and at the same speed as before the impact.

Newton's first law of motion states that Unless influenced by an imbalanced force, a body at rest stays at rest, and a body in motion keeps moving in a straight path at a constant pace. This law is commonly known as law of inertia and the resistance of a body to maintain its state of rest is called inertia of rest, same as, the resistance of a body to maintain its state of motion is called inertia of motion.

When a car is moving with certain speed, the car along with the people inside the car is in inertia of motion. In an event of accident, the car comes in rest in no time but the man in the car is still in inertia of motion. So, his body moves forward in the car which may cause injuries. To prevent such injuries, the people inside a car are advised to use safety belts.

So, correct answer  is option (D).

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Answer:

Qualitative research can identify key variables in which regards as findings. Such findings may put into a conceptual framework or a research framework, later stage, that research framework can be tested via various statistical methods such as correlation, structural equation modelling ect. Because, qualitative research do not prove any significant relationship among variables, but quantitative research do. However, based on data gathered in qualitative research, the researcher can show that there may have some relationships among variables through graphically or by using NVivo qualitative data analysis software.

Explanation:

creds to Roshan Panditharathna

You can determine the qualitative relationship that may exist in data because qualitative describes key qualities and characteristics using questionnaires, observation or interviews. On the other hand quantitative relationships are based off of numbers and are collected using graphs and charts.

Time required for the car to reach a speed of 90 km/h is 4.165 seconds.

To solve for time, use the formula for time, t = d/s which means time equals distance divided by speed.4.165 sec

In light of the posed query,

Initial velocity is 60 km/h, which is 60 x 1000 / 36600, or 16.67 m/s.

90 km/h is equal to 901000/3600, or 25.

2 m/s2 for acceleration, or a.

t = time

We are also asked to determine how long it will take the car to

accelerate to its final speed of 90 km/h.

We are aware,

v = u+at

Given the values we receive,

25 = 16.67 + 2t

2t = 25-16.67

2t = 8.33

t = 8.33/2

t = 4.165 sec

Thus, the car will take 4.165 sec to attain the final velocity of 90 km/h if its acceleration is 2 m/s^2 and initial velocity is of 60 km/h.

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Answer:

[tex]\huge\boxed{\sf P.E. = 14700\ Joules}[/tex]

Explanation:

This work done is in the form of Potential Energy so we'll use the formula of Potential Energy.

Given Data:

Mass = m = 250 kg

Acceleration due to gravity = g = 9.8 m/s²

Height = h = 6 m

Required:

Work Done in the form of Potential Energy = P.E. = ?

Formula:

P.E. = mgh

Solution:

P.E. = (250)(9.8)(6)

P.E. = 14700 Joules

[tex]\rule[225]{225}{2}[/tex]

Hope this helped!

Answer:

D.

Explanation:

the friction will cause the ball to stop moving which is a change

Rank of the magnitude of the magnetic fields in the centers of the solenoid from largest to smallest is,

[tex]B_{C}\; > B_{A}\; > B_{B}[/tex]

We know that, Magnetic field is directly proportional to Turns (N) and inversely proportional to Length (L) of the solenoid.

[tex]B \propto\frac{N}{L}\;\;\;\;\;------ equation(1)[/tex]

For Solenoid A,

[tex]Length\;(L) = L[/tex]

[tex]Turns\;(N)=N[/tex]

Substitute the value of turns and length in equation(1),

[tex]B_{A} =\frac{N}{L}[/tex]

For Solenoid B,

[tex]Length\;(L) = 2\;L[/tex]

[tex]Turns\;(N)=N[/tex]

Substitute the value of turns and length in equation(1),

[tex]B_{B} =\frac{N}{2L}[/tex]

[tex]B_{A} =\frac{1}{2}\;\frac{N}{L}[/tex]

For Solenoid C,

[tex]Length\;(L) = \frac{L}{2}[/tex]

[tex]Turns\;(N)=2N[/tex]

Substitute the value of turns and length in equation(1),

[tex]B_{C} =\frac{2N}{\frac{L}{2} }[/tex]

[tex]B_{C} =\frac{4N}{L}[/tex]

The magnetic influence on moving electric charges, electric currents and magnetic materials is described by a magnetic field, which is a vector field. A force perpendicular to the charge's own velocity and the magnetic field acts on it when the charge is travelling through a magnetic field. The magnetic field of a permanent magnet pulls on ferromagnetic substances like iron and attracts or repels other magnets. A magnetic field that varies with location will also exert a force on a variety of non-magnetic materials by changing the velocity of those particles' outer electrons.

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93.64 grams

Explanation:mass of platinum =number of moles x molar mass molar mass = atomic mass of any element ,0.48 ×195.084 = 93.64 grams

Answer:

All light pass through them

Explanation:

hope it helps u :) hv a great day

Answer:

that's your 1st cousin which is your mom or dad's sibling's child sooo when you're that close and that related i would say that that would be the reason why.

Explanation:

hoped that helped!!

Answer: Use less water

only turn on lights when needed

electrical cars

less gas usage

Explanation:

Answer:

The pan because it is directly on there to absorb heat while the handle is there more towards the end and will have heat reaching the start of the handle while the metal is already hot

Answer:1m/s2

Explanation:

Explanation:

because

1.Extremely warm masses can lead to heat waves

2.Extremely cold air masses can be just as deadly and costly

3.The"clashing "of different air masses can produce regions of severe weather

Answer:i have none but good luck also this is a learning site ;-;

Explanation:

Answer:

Nuclear reactors are the heart of a nuclear power plant. They contain and control nuclear chain reactions that produce heat through a physical process called fission. That heat is used to make steam that spins a turbine to create electricity

~+lil more info!+~

What material is used to power a nuclear reactor?

uranium !

All commercial power reactors are based on nuclear fission. They generally use uranium and its product plutonium as nuclear fuel, though a thorium fuel cycle is also possible.

Answer:

B. The surface of the Earth heats the air that contacts it.

Explanation:

Conduction is a mode of heat transfer in which energy is transferred from a hot molecule to the neighboring molecules due to contact. Thus, heat energy is transferred from one molecule to another in the process.

Therefore, the air that comes in contact with the surface of the earth heats up by conduction. Since the surface of the earth is heated up due to the radiation from the Sun.

Answer: B.

Explanation: I took the test. Also, after my diagnostic I just wanted to see if my answers were correct lol.

Answer: Plane flew 3,614 miles

Explanation: = (2 × 467) + (5 × 536)=3, 614 miles.

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The step down transformer decrease the incoming current's voltage.

Transformers go with the principle of mutual inductance . A changing magnetic field in one circle of wire actuates an electromotive force (EMF) in an adjoining circle of wire, inductively coupled to the primary. In exceptionally fundamental terms, a transformer comprises two coils of wire with tall shared inductance. These coils are electrically isolated whereas they share a common magnetic circuit. In a step-down transformer, there is a decrease in the incoming current’s voltage, where the primary voltage is the incoming voltage whereas the outgoing voltage is considered the secondary. the second coil has fewer windings than the primary, permitting a decrease in voltage within the exiting electrical stream. The primary winding, which is the primary set of coils, interfaces to an alternating-current voltage source, or primary voltage influx. The secondary coil interfaces to the stack, or secondary voltage outpouring, conveying the electrical control absent from the transformer. The substituting current streaming in at the primary voltage makes a substituting magnetic flux. This actuates a similar current within the secondary coil, making a secondary voltage. Here, the diminished number of windings within the secondary coil successfully diminishes the resultant voltage, subsequently “stepping down” the voltage to a lower value whereas keeping up a steady frequency.

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La respuesta correcta para esta pregunta abierta es la siguiente.

Para el psicoanálisis, las relaciones tempranas son las relaciones a posteriori entre los padres del recién nacido y el bebé mismo. Estas relaciones son fundamentales en los procesos de constitución subjetiva para el discurso parental para entender los aspectos del desarrollo infantil y sus diferentes estados o teorías de desarrollo para ir comprendiendo cada aspecto de la interrelación y el comportamiento entre las partes.

Para el psicoanálisis, el recién nacido está llegando a un núcleo familiar que ya está establecido y se basa en conocimientos, tradiciones y experiencias de los padres que han recibido de generaciones anteriores, y  éstas van a influir directamente en la interrelación permanente con los primeros años del crecimiento del bebé.

Answer: 160 km

Explanation:

Explanation:

V=u+at

where,

v=final speed

u=initial speed,(starting speed)

a=acceleration

t=time

6=2+2a

2a=6-2

2a=4

a=4/2 = 2

a =2

2. to find time taken

v=u+at

25=5*2t

2t=25-5

2t=20

t=20/2

t=10sec

3. finding final speed

v=u+at

v=4+10*2

=4+20

v=24m/sec

5.v=u+at

=5+8*10

=5+80

V=85m/sev

6. v=u+at

8=u+4*2

8=u+8

U=8/8

u=1

these are your missing values

Answer:

According to Newton's second law of motion, the acceleration of an object equals the net force acting on it divided by its mass, or a = F m . This equation for acceleration can be used to calculate the acceleration of an object when its mass and the net force acting on it are known

Explanation:

Answer:

Depends on the grativy of the planet. On Earth is 600 Newtons

Explanation:

W = M . G

W = 60 . 10

W = 600