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3 years ago

The human activities in two locations are described below:

Physics

2 answers:

Bogdan [553]3 years ago

5 0

Air pollution level is higher in Location B, because poisonous fumes are produced when coal burns.

CaHeK987 [17]3 years ago

3 0

Answer:

Statement (c) is true.

Explanation:

It is given that, the human activities in two locations are described below:

Location A: Wind turbines used for generating electricity

Location B: Coal used to generate electricity

From the given options the correct statement is (c) i.e. "Air pollution level is higher in Location B because poisonous fumes are produced when coal burns". It is because whenever coal is burnt, a number of toxins and pollutants such as nitrogen oxides, mercury, lead etc which causes several diseases.

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Which statement best explains the movement of electric current from the clouds to the ground during a lightning storm? .

olga2289 [7]

"The ground is positively charged and the clouds are negatively charged " is the statement among the statements given in the question that best explains the movement of electric current from the clouds to the ground during a lightning storm. The correct option among all the options that are given in the question is the third option or option "C".

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2 years ago

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Why are the significantly more thunderstorms in Florida than in California?

Andreyy89

Because Florida is wet and humid, while California is dry and non-humid. Florida also contains lots of lakes which evaporate to create thunderstorms.

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2 years ago

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How do you find the change in potential energy

ratelena [41]

P.E = mgh

This is the formula for potential energy.

This is where m is mass, g is the acceleration due to gravity, and h is height.

All you have to do is multiply all these numbers together.

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3 years ago

determine the amount of potential energy of a 5.0-N book that is moved to three different shelves on a bookcase . the height of

klasskru [66]

Potential energy is the energy that is stored in an object due to its position relative to some zero position. It is calculated by the expression PE = mgh where mg is the weight of the book and h is the height. It is calculated as follows:

PE = 50(1) = 50 J
PE = 50(1.5) = 75 J
PE = 50(2) = 100 J

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3 years ago

Space-faring astronauts cannot use standard weight scales (since they are constantly in free fall) so instead they determine the

valentinak56 [21]

Answer:

ma = 48.48kg

Explanation:

To find the mass of the astronaut, you first calculate the mass of the chair by using the information about the period of oscillation of the empty chair and the spring constant. You use the following formula:

$T=2\pi\sqrt{\frac{m_c}{k}}$ (1)

mc: mass of the chair

k: spring constant = 600N/m

T: period of oscillation of the chair = 0.9s

You solve the equation (1) for mc, and then you replace the values of the other parameters:

$m_c=\frac{T^2k}{4\pi^2}=\frac{(0.9s)^2(600N/m)}{4\pi^2}=12.31kg$ (2)

Next, you calculate the mass of the chair and astronaut by using the information about the period of the chair when the astronaut is sitting on the chair:

T': period of chair when the astronaut is sitting = 2.0s

M: mass of the astronaut plus mass of the chair = ?

$T'=2\pi\sqrt{\frac{M}{k}}\\\\M=\frac{T'^2k}{4\pi^2}=\frac{(2.0s)^2(600N/m)}{4\pi^2}\\\\M=60.79kg$ (3)

Finally, the mass of the astronaut is the difference between M and mc (results from (2) and (3)) :

$m_a=M-m_c=60.79kg-12.31kg=48.48kg$

The mass of the astronaut is 48.48 kg

3 0

3 years ago