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3 years ago

Explain why a 10 kg stone and 1 kg stone dropped from the same height

1 answer:

3 0

The acceleration of a body in a gravitational field is independent of its mass. Both the stones will fall with the same acceleration through the same height and hence they will strike the ground simultaneously.
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PLZ HELP ME The stored energy in organic matter or wastes is called biomass energy and when burned can be used to produce therma

Softa [21]

Answer:

True: The stored energy in organic matter or wastes is called biomass energy and when burned can be used to produce thermal energy used for cooking, heating homes or generating electricity.

Explanation:

For Household Needs, biomass is utilized for home heating or for cooking purposes. In that case the most common source for fuel is wood, but there are also other substances are used. Latest wood-stoves designs are made in an effective way for heating and cooking needs. With the help of those new technologies fuel consumption is decreased to a significant amount.

Humans have been using biomass energy since ages for cooking their food and heating homes by burning woods. Biomass energy can be used in homes for heating or cooking or in industries large power plants to produce electricity

What is Biomass Energy? Biomass consists of energy in stored form taken from the sun. In photosynthesis plants take energy from sun. By burning biomass the energy emitted in result can be used for heating purposes. There are many types of biomass energy made by either burning or by converting it into liquids or gas, called Bio-fuels and Bio-gas.

Summary:

No doubt Biomass contribute in air pollution formation but it is less than the pollution caused by certain gases and fossils fuels which produce sulfur resulting in acidic rain and polluting our environment.

3 0

4 years ago

A ball is dropped from rest from the top of a building of height h. At the same instant, a second ball is projected vertically u

uranmaximum [27]

Answer:

a) $t = \sqrt{\frac{h}{2g}}$

b) Ball 1 has a greater speed than ball 2 when they are passing.

c) The height is the same for both balls = 3h/4.

Explanation:

a) We can find the time when the two balls meet by equating the distances as follows:

$y = y_{0_{1}} + v_{0_{1}}t - \frac{1}{2}gt^{2}$

Where:

$y_{0_{1}}$ : is the initial height = h

$v_{0_{1}}$ : is the initial speed of ball 1 = 0 (it is dropped from rest)

$y = h - \frac{1}{2}gt^{2}$ (1)

Now, for ball 2 we have:

$y = y_{0_{2}} + v_{0_{2}}t - \frac{1}{2}gt^{2}$

Where:

$y_{0_{2}}$ : is the initial height of ball 2 = 0

$y = v_{0_{2}}t - \frac{1}{2}gt^{2}$ (2)

By equating equation (1) and (2) we have:

$h - \frac{1}{2}gt^{2} = v_{0_{2}}t - \frac{1}{2}gt^{2}$

$t=\frac{h}{v_{0_{2}}}$

Where the initial velocity of the ball 2 is:

$v_{f_{2}}^{2} = v_{0_{2}}^{2} - 2gh$

Since $v_{f_{2}}^{2}$ = 0 at the maximum height (h):

$v_{0_{2}} = \sqrt{2gh}$

Hence, the time when they pass each other is:

$t = \frac{h}{\sqrt{2gh}} = \sqrt{\frac{h}{2g}}$

b) When they are passing the speed of each one is:

For ball 1:

$v_{f_{1}} = - gt = -g*\sqrt{\frac{h}{2g}} = - 0.71\sqrt{gh}$

The minus sign is because ball 1 is going down.

For ball 2:

$v_{f_{2}} = v_{0_{2}} - gt = \sqrt{2gh} - g*\sqrt{\frac{h}{2g}} = (\sqrt{1} - \frac{1}{\sqrt{2}})*\sqrt{gh} = 0.41\sqrt{gh}$

Therefore, taking the magnitude of ball 1 we can see that it has a greater speed than ball 2 when they are passing.

c) The height of the ball is:

For ball 1:

$y_{1} = h - \frac{1}{2}gt^{2} = h - \frac{1}{2}g(\sqrt{\frac{h}{2g}})^{2} = \frac{3}{4}h$

For ball 2:

$y_{2} = v_{0_{2}}t - \frac{1}{2}gt^{2} = \sqrt{2gh}*\sqrt{\frac{h}{2g}} - \frac{1}{2}g(\sqrt{\frac{h}{2g}})^{2} = \frac{3}{4}h$

Then, when they are passing the height is the same for both = 3h/4.

I hope it helps you!

7 0

4 years ago

Learning Goal: To apply the law of conservation of energy to an object launched upward in the gravitational field of the earth.

marishachu [46]

Answer:

$h=\frac{1}{2}\frac{v^2}{g}$

Explanation:

Let's assume that an object is launched straight upward in a gravitational field. Its initial kinetic energy is given by

$K=\frac{1}{2}mv^2$ (1)

where m is the mass and v is the initial speed.

As the object goes higher, its kinetic energy decreases and it is converted into gravitational potential energy, since the total mechanical energy (sum of kinetic and potential energy) must remain constant:

$E=K+U=const.$

At the highest point of the trajectory, the speed of the object is zero (v=0), so the kinetic energy is also zero (K=0), which means that all the kinetic energy has been converted into potential energy:

$U=mgh$ (2)

where g is the gravitational acceleration and h is the maximum height of the object.

Due to conservation of energy, we can write that (1) and (2) are equal, so:

$\frac{1}{2}mv^2=mgh$

from which we can derive an expression for the maximum height reached by the object

$h=\frac{1}{2}\frac{v^2}{g}$

5 0

3 years ago

A driver drives a car up a hill. The driver keeps pressing the gas so that the engine increases the force it applies to the car.

iris [78.8K]

Answer:

because it's on an upward climb therefore newton's law of motion is in place and you're car is pulled by gravity

6 0

3 years ago

Match the words in the left-hand column to the appropriate blank in the sentences in the right-hand column. use each word only o

sp2606 [1]

<span>1. About a trillion comets are thought to be located far, far beyond pluto in the Oort cloud. Oort cloud is theoretical cloud of predominantly icy planetesimals and. Many scientists have a belief that it surrounds the Sun at the distance of approximately between 50,000 and 200,000 AU. Such forces as passing stars and of the Milky Way usually easily affect the outer Oort cloud and dislodge comets right from their orbits through the Oort the cloud and then they send them to the the inner Solar System.
2. The bright spherical part of a comet observed when it is close to the sun is the coma. When coma is viewed by a telescope it looks quite fuzzy and, unlike the stars, it does not have legible form. Such a phenomenon as the coma is created when a comet comes too close to the sun, then a comet warms and sublimes its parts. These parts are placed around the nucleus of a comet forming sort of envelope.
3. A comet's plasma tail stretches directly away from the sun. Both coma and comet's tail are visible parts of a comet, and when the comet passes through the inner Solar System we it becomes visible right from Earth. Usually comets have two tails :the blue plasma tail and the red dust tail. The plasma tail is formed by an interaction between the solar wind and the cometary plasma. And the dust tail is caused due to the activity of solar radiation pressure directed to the cometary dust.
</span>

4. A comet's nucleus is the frozen portion of a comet. The conet nucleus is the solid center of the head of a comet that is also called ''dirty snowball'' or an ''icy dirtball'' among astronomists. It consists of rock, dust, and frozen gases and when they are heated by the Sun they form a coma (which is an atmosphere that surrounds nucleus) by sublimating of the gases.

5. Particles ejected from a comet can cause a meteor shower on Earth. A meteor shower is a celestial phenomenon during which we can see how meteors radiate. The meteors which we can observe are formed by meteoroids that enter Earth's atmosphere at extremely high speeds and they usually move in parallel directions. Some of the meteors are too small and often don't even reach the surface of Earth as they disintegrate during the entering process.

6. The Kuiper Belt extends from about beyond the orbit of neptune to about twice the distance of neptune from the sun. It is the circumstellar disc that uccurs in the Solar System beyond the already known planets. Its formreminds of asteroid belt, but it is far larger, to be more exact in 20 times. I

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3 years ago