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mojhsa [17]
4 years ago
10

A scientific _________ is a proposed explanation for a fairly narrow set of phenomena, usually based on prior experience, scient

ific background knowledge, preliminary observations, and logic.
Physics
1 answer:
blondinia [14]4 years ago
8 0

Answer:

A scientific hypothesis

Explanation:

A scientific hypothesis is an idea or explanation for a fairly narrow set of phenomena that you then test through research, experimentation, experience, scientific background knowledge, preliminary observations, and logic. They are the initial building block in the scientific method and they are also beyond a wild guess but less than a well-established theory.

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How does the conservation of energy effect our lives?
kupik [55]

Answer:

The Good with the Bad

What do eating a large delicious meal, taking out a loan to buy a car, and staying up all night to finish a paper have in common? They're all things that produce a good result or make us happy, but also have some negative consequences (gaining weight, going into debt, and being tired respectively). Everything in life has negative and positive consequences. Energy conservation is no different. In this lesson, we will learn more about the intended and unintended consequences of energy conservation.

Intended Consequences of Energy Conservation

In light of air pollution, the overuse of fossil fuels, and other issues efforts to conserve energy have been ramped up in the last few decades. Energy conservation can refer to reducing the amount of energy used or finding alternatives to traditional energy sources. There are several ways to conserve energy.

Recycling

Recycling involves making new products out of already existing material. This method of energy conservation works by taking already formed material and processing it into something new. It takes much more energy to create material from scratch than to make it from recycled material. For example, it takes 30% less energy to make recycled glass than to make brand new glass.

Reducing Energy Use in Homes

We can conserve energy in our homes by unplugging and turning off lights and appliances when they are not in use. Obviously, there are some exceptions. Please don't go unplugging your refrigerator! However, many appliances like coffee makers and cell phone chargers can be unplugged when you're not using them. Homeowners can also better insulate their homes to reduce heat usage. Energy can also be conserved by buying appliances that are designed to be energy efficient. Both of these strategies save consumers money on their electric bills, so it's a win-win situation. Using less power overall reduces the pollution from power plants. When we use less energy in our homes, the power plants need to burn less fossil fuels. Burning less fossil fuels reduces pollution and helps conserve natural resources.

Save the Animals

As mentioned above, when consumers use less energy, less fossil fuels need to be burned. When the demand for fossil fuels is reduced, there is less drilling for oil and extraction of resources from nature. Less extraction from the environment results in less damage to habitats and ecosystems. When there are less fossil fuels used, there is also a reduction in oil spills in the oceans and in toxic waste produced from power plants. All of these factors benefit animals and the environment because they are disturbed less.

In this section we will discuss three specific energy conservation efforts and their unintended consequences.

Wind Power

Wind Power involves the use of large turbines (blades) that turn wind into useful energy. Wind turbines can take up large areas of land. While that land can often be shared due to the largest part of the turbines being in the air, flying birds and bats can be killed by spinning turbines. It seems pretty logical to place wind turbines near oceans since shore areas are often windy. However, the turbines can disrupt the habitats due to the space they take up and the danger they pose to flying animals. Another issue is that wind turbines can be annoying to the people who live near them. Some people have reported issues with sound and vibration from the turbines.

8 0
3 years ago
4.-El bloque de la figura recibe las fuerzas que se muestran
Irina-Kira [14]

Answer

que?

Explanation:

4 0
3 years ago
The drawing shows three particles far away from any other objects and located on a straight line. The masses of these particles
miss Akunina [59]

Formula of the gravitational force between two particles:

F=G\frac{m_1 m_2}{r^2}

where

G=6.67 \cdot 10^{-11} Nm^2 kg^{-2} is the gravitational constant

m1 and m2 are the masses of the two particles

r is their distance


(a) particle A

The gravitational force exerted by particle B on particle A is

F_B=G\frac{m_A m_B}{r^2}=(6.67 \cdot 10^{-11}) \frac{(340 kg)(567 kg)}{(0.500 m)^2}=5.14 \cdot 10^{-5} N to the right

The gravitational force exerted by particle C on particle A is

F_C=G\frac{m_A m_C}{r^2}=(6.67 \cdot 10^{-11}) \frac{(340 kg)(139 kg)}{(0.500 m+0.250m)^2}=5.6 \cdot 10^{-6} N to the right

So the net gravitational force on particle A is

F_A = F_B + F_C =5.14 \cdot 10^{-5} N+5.6 \cdot 10^{-6} N=5.7 \cdot 10^{-5} N to the right


(b) Particle B

The gravitational force exerted by particle A on particle B is

F_A=G\frac{m_A m_B}{r^2}=(6.67 \cdot 10^{-11}) \frac{(340 kg)(567 kg)}{(0.500 m)^2}=-5.14 \cdot 10^{-5} N to the left

The gravitational force exerted by particle C on particle B is

F_C=G\frac{m_B m_C}{r^2}=(6.67 \cdot 10^{-11}) \frac{(567 kg)(139 kg)}{(0.250 m)^2}=8.41 \cdot 10^{-5} N to the right

So the net gravitational force on particle B is

F_B = F_A + F_C =-5.14 \cdot 10^{-5} N+8.41 \cdot 10^{-5} N=3.27 \cdot 10^{-5} N to the right


(c) Particle C

The gravitational force exerted by particle A on particle C is

F_A=G\frac{m_A m_C}{r^2}=(6.67 \cdot 10^{-11}) \frac{(340 kg)(139 kg)}{(0.500 m+0.250m)^2}=-5.6 \cdot 10^{-6} N to the left

The gravitational force exerted by particle B on particle C is

F_B=G\frac{m_B m_C}{r^2}=(6.67 \cdot 10^{-11}) \frac{(567 kg)(139 kg)}{(0.250 m)^2}=-8.41 \cdot 10^{-5} N to the left

So the net gravitational force on particle C is

F_C = F_B + F_A =-8.41 \cdot 10^{-5} N-5.6 \cdot 10^{-6} N=-8.97 \cdot 10^{-5} N to the left



3 0
3 years ago
A 2000 kg car is driving at 5 m/s on wet asphalt, but then makes a turn on some ice and loses control. The driver applies brakes
lesya [120]

Answer:

10,000kgm/s

Explanation:

Since we not told what to look for, we can as well find the momentum of the car.

momentum = mas * velocity

Given

Mass of the car = 2000kg

velocity = 5m/s

Substitute into the formula

Momentum = 2000 * 5

Momentum = 10000kgm/s

Hence the momentum of the car is 10,000kgm/s

5 0
3 years ago
The frequency of a microwave signal is 9.76 ghz. what is its wavelength? (c = 3.00 × 108 m/s)
dolphi86 [110]
The basic relationship between frequency of an electromagnetic wave and wavelength of the wave is
c = \lambda f
where c=3 \cdot 10^8 m/s is the speed of light.

Manipulating the equation, we can rewrite it as
\lambda =  \frac{c}{f}

The frequency of the wave in our problem is
9.76 GHz = 9.76 \cdot 10^9 Hz
so if we use the previous formula, we find the correspondant wavelength:
\lambda =  \frac{3 \cdot 10^8 m/s}{9.76 \cdot 10^9 Hz} =0.031 m
8 0
3 years ago
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