What is the net force EF?

Answer:

209000 kg*m/s

Explanation:

Momentum is caclucated using the equation P=mv. Where m is mass and v is velocity.

If you are required to show your work it would be the following:

1400*70=98000 kg*m/s

1300*85=110500 kg*m/s

98000+110500=208500 kg*m/s

209000 kg*m/s

Answer:

your answer will be the letter B

Answer:

(a). 640.000 --- 6 significant figures.

(b). 2.0 --- 2 significant figures.

(c). 0.520200 --- 6 significant figures.

(d). 10.05 --- 4 significant figures.

(e). 10,000.0 --- 6 significant figures.

(f). 30.7 --- 3 significant figures.

(g). 0.00000065 --- 8 significant figures.

Given that,

Mass, m = 250 g

Volume of the container, V = 50 cm³

To find,

The density of the oil.

Solution,

Density = mass/ volume

The computation for density is as follows :

[tex]\rho =\dfrac{m}{V}\\\\\rho =\dfrac{250\ g}{50\ cm^3}\\\\=5\ g/cm^3[/tex]

So, the density of the oil is [tex]5\ g/cm^3[/tex].

Answer:

The velocity of the cricket ball is 17.32 m/s

Time is taken by the ball to reach the highest point = 0.8660 seconds

Explanation:

The cricket ball can be seen and treated as a projectile in this case

The maximum height attained by a projectile in motion can be calculated using the formula:

[tex]h = \frac{v^2 sin^2 \theta }{2g}[/tex]

In any projectile problem, once we know see that the object was released vertically upwards, we need to know that this means that the angle of projection is 90 degrees, and sin 90 is = 1

hence, h will be modified to become

[tex]h = \frac{v^2 }{2g}[/tex]

[tex]v = \sqrt{2gh}[/tex]

We are given that h = 15m and g = 10m/s2

[tex]v = \sqrt{2 \times 10 \times 15} = 17.32m/s[/tex]

The velocity of the cricket ball is 17.32 m/s

B. We can get the time it took to reach the highest point by dividing

time = distance/speed

Time = 15/17.32 = 0.8660 seconds

Answer:

C. infrared waves

Explanation:

Microwaves are the electromagnetic waves which would the best to use in an object designed to cook food. Thus, the correct option is D.

Microwave is a form of electromagnetic radiation with the wavelengths ranging from about one meter to about one millimeter which is corresponding to the frequencies in the range between 300 MHz and 300 GHz, respectively.

Microwaves are used for cooking food faster than the conventional ovens and would not make a mess in the process. This reheats food instantly quickly. It is helpful for the health conscious people. Microwaves also ensure that a person will never burn the food again. Microwaves are also very economical and energy efficient.

Therefore, the correct option is D.

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Major land–use changes have occurred in the United States during the past 25 years. The total area of cropland, pastureland and rangeland decreased by 76 million acres in the lower 48 states from 1982 to 2003, while the total area of developed land increased by 36 million acres or 48%. What are the potential economic, social and environmental impacts of land use changes? How does land use change affect agriculture and rural communities? What are the important economic and environmental implications for commodity production and trade, water and soil conservation, open space preservation, and other policy issues? This article addresses some of these issues and their policy implications.

Answer:

Technique of comparing abundance ratio between radioactive isotopes to a reference isotope to determine the age of a material called radioactive dating. It determines the age by having a more abundance of isotopes in the cellular being.

Answer:

because switch moves after a waiter

Explanation:

Answer:

1/2 hours

Explanation:

The formula for speed is given as;

s= d/ t -----where

s is speed ,  80 km/h

d is distance , 40 km

t is time = ?

Making t is subject of the formula;

t= d/s

Using the values given

t= 40 / 80

t= 1/2 hours

Answer:

c

Explanation:

Atlantic Ocean (salt water)

Acceleration is the answer.............

Answer:

0.68 m

Explanation:

α = dL / L1*(dT)

dL = L1(dT) * α

Initial length, L1 = 100

Chang in Length =dL

α linear expansivity ; dL = change in length ; dT = change in temperature ; L1 = initial length

α of iron rod = 1.13 * 10^-5 k

dL = 100(40 - 10) * 1.13 * 10^-5

dL = 100(30) * 1.13 * 10^-5

dL = 3000 * 1.13 * 10^-5

dL = 3390 * 10^-5

dL = 0.0339 m

Error :

Distance measured = 2km = (2 * 1000) = 2000m

[Distance measured / (initial length + change in length)] × change in length

Error = (2000 / (100 + 0.0339)) * 0.0339

Error = (2000 / 100.0339) * 0.0339

Error = 19.993222 * 0.0339

Error = 0.6777702

Error = 0.68 m

Answer: You didnt finish the question. But as magma cools it turns to igneous rock.

answer 4

Explanation:

Answer:B

Explanation:

The statement that summarizes the paragraph is northern hemisphere has more daylight hours.

The Earth is part of the nine planet and it comprises of the equator, northern and southern hemisphere.

It is the most suitable place for living because it have water,oxygen and other gases that support life.

Therefore, The statement that summarizes the paragraph is northern hemisphere has more daylight hours.

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Answer:

b. Continental-oceanic

Explanation:

The Earth's crust has been divided into a series of plates. These plates move at a different rate or speed in different directions.

These plates are divided by the boundary between them which are of three types: convergent, transform and divergent.

The convergent boundaries are the one which moves toward each other and the based on the crust they are of three types: continent-continent, ocean-ocean and ocean-continent.

In ocean-continent boundaries, the oceanic plate is denser compared to the continental plate is lighter as a result of which during the process of subduction the oceanic plate sinks beneath the continental plate towards the mantle and melts.

Thus, Option-B is the correct answer.

Answer:

Radio Waves

Explanation:

Explanation:

The pH scale is an index ranging from 0-14 which measures the acidity or basicity of substances. The closer the pH of an acid to 0 the stronger it is and the closer the pH of a base to 14,the stronger it is.

Answer:

Acids break down fabrics and can cause burns if the acids are strong.

Explanation:

A protective apron or lab coat is important when working with acids because acids break down fabrics and can cause burns if the acids are strong.

Answer:

C

Explanation:

I got it right

Answer:

asfsdfasasfsda

Explanation:

Answer:

IDEK HOW TO SOLVE

Explanation:

Answer:

50%

Explanation:

Gg = 50%

gg = 50%

are these punnet squares?

Answer:

Simply put, slope refers to the steepness of a line. The larger the slope, the steeper the line. Slope is often referred to as 'rise over run' because it is calculated by the change in the vertical (rise) divided by the change in the horizontal (run). ... For example, a high value of slope means a very steep line.

Answer:

The solar nebula became hot and dense because of that it pulling in more gas. This flattened into a rotating disk. It  spun  faster and faster, forming the Sun.

Explanation:

hope this helps

The solar nebula became hot and dense because of that it pulling in more gas. This flattened into a rotating disk. It  spun  faster and faster, forming the Sun. This order did the events forming our solar system occur.

In the so-called nebular hypothesis of the genesis of the solar system, the Sun and planets originated by condensation from a gaseous cloud. In 1734, Swedish philosopher Emanuel Swedenborg claimed that the planets arose from a nebular crust that enveloped the Sun before breaking apart. Immanuel Kant, a German philosopher, proposed in 1755 that the Sun and planets were created by a slow rotating nebula that was eventually pushed together by its own gravitational force and flattened into a spinning disc. In 1796, the French astronomer and mathematician Pierre-Simon Laplace presented a similar concept, but with the planets forming before the Sun. The Kant-Laplace theories were criticised by the British physicist James Clerk in the late nineteenth century.

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Answer:

Radiant energy from the Sun is converted into electrical energy. Electrical energy is then converted into chemical energy. Chemical energy is then converted into electric energy for the motor. The motor converts electrical energy into mechanical energy and makes the car move.

Sun makes radiant energy > converted to electrical energy through solar panels > converted to chemical energy which is then stored in a battery for the motor > converted into mechanical energy to make the car move

Extra:

Look at the image below for a better understanding of the question. I hope this helps! :)

Source:

Edmentum Guided Notes

The energy transformations that can be seen in solar-powered electric cars :

Solar energy >  electrical energy > chemical energy  > mechanical energy.

A solar electric car is one that is primarily or entirely powered by solar energy. Solar panels typically feature photovoltaic (PV) cells that convert solar energy directly into electric energy. The phrase "solar vehicle" typically implies that all or some of a vehicle's propulsion is powered by solar energy. Communications, controls, and other auxiliary operations might all be powered by solar energy.

In solar electric car, solar energy converted into electrical energy by  photovoltaic (PV) cells. This energy is stored in battery in the form of chemical energy. When the car moves, this chemical energy transforms into mechanical energy.

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