Please help asap I need my grade up in an hour lol

Answer:

252000 J

Explanation:

W = Pt

W = (21000 w)(12 s)

W =252000 J

Answer:

a change of position in relation to another object.

Explanation:

Motion can be defined as a change in the location (position) of a physical object or body with respect to a reference point.

This ultimately implies that, motion would occur as a result of a change in location (position) of an object with respect to a reference point or frame of reference i.e where it was standing before the effect of an external force.

A reference point refers to a location or physical object from which the motion (movement) of another physical object or body can be determined.

Mathematically, the motion of an object is described in terms of acceleration, time, distance, speed, velocity, displacement, position, etc.

Hence, motion is a change of position in relation to another object.

Answer:

The electrical energy consumed in boiling the water is 0.0788 kWh

Explanation:

Given;

mass of the water, m = 600 g = 0.6 kg

power rating of the kettle, P = 1500 W = 1.5 kW

specific heat capacity of water, c = 4,200 J/kg⁰C

density of water, = 1000 kg/m³

time taken to boil the water, t = 3 mins + 9 s = (3 x 60s) + 9 s = 180 s + 9 s = 189 s = [tex]189 \ s \times \frac{1 hr}{3.600 \ s} = 0.0525 \ hr[/tex]

The electrical energy consumed in boiling the water is calculated as;

E = P x t

E = 1.5 kW  x 0.0525 hr

E = 0.0788 kWh

Therefore, the electrical energy consumed in boiling the water is 0.0788 kWh

Answer:

63.0 x (6.02 x 10^23) = 3.79 x 10^25 atoms of gold

Explanation:

There are 6.02 x 10^23 representative particles in a mole of any substance. Multiply it by the number of moles, and you will get the number of representative particles (atoms, molecules, formula units)

Answer:

human body contain 80% water and water is a good condition of current because our body fluid contain different type of salt that increase the current conductivity

Answer:

ikn

Explanation:

Answer:

the distance is 15+20=35 cm

Answer:

No, because a scientific law is always absolutely true, no matter what a vote could not change a scientific law. People can vote how fast the speed of light is per second, but light will always be the speed it is no matter what.

Answer:

Reigon 1

Explanation:

It has the higest rate of landslides currently

Answer:

STEP BY STEP

V = S/T

V= 10/5

V = 2 m/s

Answer:

Explanation:

For refraction , the formula is

sin i / sin r = μ₂ / μ₁

where light is travelling from medium 1 to 2 having refractive index of μ₁ and μ₂ . Angle of incidence in medium 1 is i and angle of refraction in medium 2 is r .

Here i = 70°, r = 37°

μ₁ = 1.8 ,μ₂ = ?

sin70 / sin 37 = μ₂ / 1.8

.939 / .602 = μ₂ / 1.8

1.56 =  μ₂ / 1.8

μ₂ = 2.81 .

The value of refraction index for the second medium will be  [tex]\mu_2=2.16[/tex]

Every material has a different refractive index. The refracted index of any material shows that the light is refracted by how much angle.

So like for water its value will be different also for glass its value will be different.

Now it is given in the question that

Angle of incidence [tex]i=70^o[/tex]

Refractive index of the first medium [tex]\mu_1=1.8[/tex]

Angle of refraction [tex]r=37^o[/tex]

Now from snells law

[tex]\dfrac{Sin \ i}{Sin \ r} = \dfrac{\mu_2}{\mu_1}[/tex]

[tex]\dfrac{Sin70}{Sin37} = \dfrac{\mu_2}{1.8}[/tex]

[tex]\mu_2= \dfrac{Sin70\times1.8}{Sin37}[/tex]

[tex]\mu_2=2.16[/tex]

Thus the value of the refraction index for the second medium will be  [tex]\mu_2=2.16[/tex]

To know more about the Refractive index follow

https://brainly.com/question/10729741

Answer:

The primary properties of visible light are intensity, propagation-direction, frequency or wavelength spectrum and polarization, while its speed in a vacuum, 299 792 458 m/s, is one of the fundamental constants of nature.

Explanation:

Light is made of particles called photons, bundles of the electromagnetic field that carry a specific amount of energy. With sufficiently sensitive experiments, you can count photons or even perform measurements on a single one. Researchers have even frozen light temporarily.

Hope this Helps     :)

Answer:

Wood, metal, Stone

Explanation:

Answer:

Thermal resistance,Specific Heat Capacity,Density

Explanation:

Answer:

The movement of a roller coaster is accomplished by the conversion of potential energy to kinetic energy. The roller coaster cars gain potential energy as they are pulled to the top of the first hill. As the cars descend the potential energy is converted to kinetic energy. Roller coasters rely on gravity to take them to the end of the track. This involves two types of energy, potential energy and kinetic energy.

Explanation: my mom told me lol ..

Answer:

The movement of a roller coaster is accomplished by the conversion of potential energy to kinetic energy. The roller coaster cars gain potential energy as they are pulled to the top of the first hill. As the cars descend the potential energy is converted to kinetic energy.

Explanation:

That's gonna help right?

Answer:

see below

Explanation:

2 Hz, means 2 complete waves are produced in one second, so

2 waves ----- 1 second

2 x 60 -------1 x 60

120 waves ------60 seconds

hope this helps,

please mark it

Given:

Frequency= 2Hz

Number of waves = ?

= 120 waves

Therefore, the number of waves that will be formed in one minute is 120 waves

Learn more at : https://brainly.com/question/23020230

When electrons are lost a positive ion is formed. When electrons are gained, a negative ion is formed. I hope this helps

Answer:

The total cost before taxes to fence the garden is approximately $198.71

Explanation:

The given parameters for the garden are;

The diameter of the garden, D = 11 m

The cost of the fencing, UnitC = $5.75/m

The circumference of a circle, C = π·D

Therefore, the perimeter of the garden, C = π × 11 m ≈ 34.5575 m

The total cost before taxes to fence the garden, T = C × UnitC

∴ The total cost before taxes to fence the garden, T, is given as follows;

T ≈ 34.5575 m × $5.75/m ≈ $198.71

The total cost before taxes to fence the garden, T ≈ $198.71

Answer:

[tex]71.865\ \text{kg}[/tex]

Explanation:

Mass of car = 1400 kg

T = Time period = 0.371 s

k = Spring constant = [tex]1.21\times 10^{5}\ \text{N/m}[/tex]

Time period is given by

[tex]\dfrac{1}{T}=\dfrac{1}{2\pi}\sqrt{\dfrac{k}{m}}\\\Rightarrow m=4\dfrac{kT^2}{4\pi^2}\\\Rightarrow m=\dfrac{4\times 1.21\times 10^5\times (0.371)^2}{4\pi^2}\\\Rightarrow m=1687.46\ \text{kg}[/tex]

The 4 in the numerator is because there are 4 springs

Mass of car with people is 1687.46 kg.

Mass of people

[tex]1687.46-1400=287.46\ \text{kg}[/tex]

Mass of each person

[tex]\dfrac{287.46}{4}=71.865\ \text{kg}[/tex]

Mass of each person is [tex]71.865\ \text{kg}[/tex].

The time between two new Moon phases or two full Moon phases is 29.5 days. ... The difference of 29.5 and 27.3 is that while the Moon is orbiting the Earth, the Earth is moving along in its orbit so it takes longer for the Moon to reach the same position relative to the Sun.

Answer: It leads to a front. A front is.., I don't know how to explain it, so I'll add a picture. Fronts are made out of clouds and usually bring rain. So the answer is C: The formation of clouds and rain.

Explanation:

Answer:

the văd and food are exemple of energy

Answer:

the gas and food are example of energy

Explanation:

EDGE 2021

Answer:

draw the two atomic structures and then focus in on the electrons either gaining or losing and draw them with arrows and dots

Explanation:

Answer:

4500N

Explanation:

Force =mass into acceleration

So 1500 into 3 you will get 4500

Answer:

Kinetic Energy

Explanation:

Energy that a moving object has due to its motion is Kinetic Energy.

Answer:

v₃ = 1.334 m/s

Explanation:

This problem can be solved using the law of conservation of momentum:

[tex]m_{1}u_{1} + m_{2}u_{2} + m_{3}u_{3} = m_{1}v_{1} + m_{2}v_{2} + m_{3}v_{3}\\[/tex]

m₁ = mass of bullet = 8.73 g = 0.00873 kg

m₂ = mass of first block = 1201 g = 1.201 kg

m₃ = mass of second block = 1606 g = 1.606 kg

u₁ = initial speed of bullet = 345 m/s

u₂ = initial speed of first block = 0 m/s

u₃ = initial speed of second block = 0 m/s

v₁ = final speed of bullet = v₃ (since the bullet is embedded in second block)

v₂ = final speed of first block = 0.714 m/s

v₃ = final speed of second block = ?

Therefore,

[tex](0.00873\ kg)(345\ m/s)+(1.201\ kg)(0\ m/s)+(1.606\ kg)(0\ m/s)=(0.00873\ kg)(v_{3})+(1.201\ kg)(0.714\ m/s)+(1.606\ kg)(v_{3})[/tex]

[tex]3.0118\ kg.m/s - 0.8575\ kg.m/s = (1.6147\ kg)(v_{3})\\\\v_{3} = \frac{2.1543\ kg.m/s}{1.6147\ kg} \\[/tex]

v₃ = 1.334 m/s

Answer:

F=ma

a=F/m=20/5=4 m/s^2

Answer:

1. 7.5 km/h

2. 1 hour, 52 minutes, 30 seconds

3. 0.8 Joules

4. 13.33 mph

5. 19456 Joules

6. 10.5 kg

Explanation:

Answer:

19.32

Explanation:

the wavelength formula is speed divided by frequency

speed = 5100m/s

frequency = 264Hz

so wavelength = 5100 m/s / 263 Hz

= 19.32

Rest is the state of an object being stationary relative to a particular frame of reference or another object; when the position of a body with respect to its surroundings does not change with time it is said to be "at rest".