PHYSICS HIGH SCHOOL



Explain why ultra-high voltages are
used to carry electricity over transmission lines.

Answers

Answer 1
Answer: Well, let's take it the other way. If you have a rather low voltage (220 volts -- Europe -- is low) you'd get a high current, which more easily dissipates as heat, resulting in loss of energy. Using a high voltage you have a low current which could easily be transported with almost no loss.

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An automobile having a mass of 941 kg is driven into a brick wall in a safety test. The bumper behaves like a spring of constant 2.37 × 106 N/m and compresses 1.61 cm as the car is brought to rest What was the speed of the car before impact, assuming no energy is lost during impact with the wall? Answer in units of
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A solution is measured to have a pH of 2.3. What is most likely also true about the solution?1.)It has a low hydroxide ion concentration.
2.)It has a low hydronium ion concentration.
3.)It is neutral.
4.)It has no H2O molecules.

Answers

According to the pH scale, a solution that has a pH of < 7 is considered an acid. Since it is established that the solution is an acid, there will be a low OH- concentration (hydroxide ion) in solution. In terms of hydronium ion, an acid has a higher amount of hydronium ion concentration.

Answer:

the answer is A

Explanation:

took my segment exam!!

A wave x meters long has a speed of y meters per second. The frequency of the wave isa. x/y hertz
c. y x hertz
b. y/x hertz
d. y x hertz

Answers

The correct answer is (b.) y/x hertz. That is because the formula to get the frequency is f =  v / w. The following values (v=y meters / second; wavelength = x meters) must be substituted to the equation, which leaves you y/x hertz.

Answer:

b. y/x hertz

Explanation:

In 2000, NASA placed a satellite in orbit around an asteroid. Consider a spherical asteroid with a mass of 1.50×1016 kg and a radius of 9.00 km .What is the speed of a satellite orbiting 4.60 km above the surface?

Answers

Answer:

8.58 m/s.

Explanation:

Given,

Mass of the asteroid,M = 1.50 x 10¹⁶ Kg

radius = 9 Km

distance of the satellite, r = 4.60 Km

Speed of the satellite  = ?

R = 9 + 4.60 = 13.60 Km

Speed of the satellite rotating in orbit

v = \sqrt{(GM)/(R)}

G is gravitational constant

v = \sqrt{(6.67* 10^(-11)* 1.50* 10^(16))/(13.60* 10^3)}

v = 8.58 m/s

Speed of the satellite is equal to 8.58 m/s.

Which region of the electromagnetic spectrum has the longest wavelength?

Answers

That's the region we call "radio waves".

A speeding car collides with an unlucky bug flying across the road Which explains why the impact doesn't equally damage the car and the bug

A. The car has more momentum
B.the bug is traveling faster
C. The bug has more momentum
D. The net force is zero

Answers

The collision produces forces between the car and the bug. These forces depend on the momentums of the objects that collide.Momentum is the product of mass and velocity. The greater the mass the smaller the acceleration. That is the Newton's second law. Because the mass of the car is greater, it's momentum is also greater and the accelaration is smaller. so, the bigger momentum of the car explains the different damage.

its A cat has more momentum

HELP ME PLEASEE Why are chemical processes unable to produce the same amount of energy flowing out of the sun as nuclear fusion

i have no clue about it :(

Answers

One of the major differences between nuclear reactions and chemical reactions is that nuclear reactions involve larger amount of energy than chemical energy. This is because the force between the protons and neutrons in the nucleus of an atom is much higher than the force of attraction between electrons and the positively charged nucleus, hence nuclear reactions involves/requires a larger amount of energy (because it's reactions involve the nucleus) than chemical reactions (because it's reactions involve the electrons).
Thus, during nuclear fusion, two light nuclei are bombarded against one another to produce a larger/heavier nuclei with the release of large amount of energy (because the forces between the protons and neutrons are much higher) unlike when two atoms/molecules are chemically combined together to form a new molecule with the rearrangement of electrons in the valence shells of the participating molecules.

Answer:

I think because of sun is made from very hot gases

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