PHYSICS HIGH SCHOOL

Which statement best describes perigee?A. The closet point in the Moon's orbit to Earth
B. The farthest point in the Moon's orbit to Earth
C. The closest point in Earth's orbit of the Sun
D. The Sun's orbit that is closest to the Moon

Answers

Answer 1
Answer:

Answer:

A. The closest point in the Moon's orbit to Earth

Explanation:

The perigee is defined as the closest point in the orbit of an object (such as a satellite) from the centre of the Earth. In this case, the Earth's satellite is the Moon, so the perigee is defined as the closest point in the Moon's orbit to Earth. so option A is the correct one.

Let's see instead the names of the other options:

B. The farthest point in the Moon's orbit to Earth  --> this point is called apogee

C. The closest point in Earth's orbit of the Sun  --> this point is called perihelion

D. The Sun's orbit that is closest to the Moon --> this point has no specific name
Answer 2
Answer: A. The closet point in the Moon's orbit to Earth

Hope I helped:P

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What is an amplitude??

Answers

Answer:

maximum extent of a vibration or oscillation measured from the position of equilibrium.

Answer:

the maximum displacement or distance moved by a point on a vibratng body or wave measured from its equilibrium position. it is equal to one-half lenght of the vibration path.

Explanation:

hope it helps

The AC voltage source is connected to an inductor and a resistor in series. If the frequency of the source is increased the current in the circuit will _________.

Answers

Answer:

If the frequency of the source is increased the current in the circuit will decrease.

Explanation:

The current through the circuit is given as;

I = (V)/(Z)

Where;

V is the voltage in the AC circuit

Z is the impedance

Z = √(R^2 + X_L^2)

Where;

R is the resistance

X_L is the inductive reactance

X_L = ωL = 2πfL

where;

L is the inductance

f is the frequency of the source

Finally, the current in the circuit is given as;

I = (V)/(√(R^2 + (2\pi fL)^2) )

From the equation above, an increase in frequency (f) will cause a decrease in current (I).

Therefore, If the frequency of the source is increased the current in the circuit will decrease.

For life to flourish on Earth, several changes occurred that affected the atmosphere, such as _____.

Answers

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Are the options

A compact disc has a radius of 6 centimeters.a. What is its circumference in meters?
b. If the cd rotates 4 times per second, what is the linear speed of a point on the outer edge of the cd? Give
your answer in meters per second.
c. What is the linear speed of a point 3 centimeters from the center of the cd? (Assume the angular speed
has not changed).

Answers

Circumference is 2\pi{r}=37.7 (approx.)
Speed is 4 times that. That is, 150.8 cm/s or 1.508 m/s.
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Answer:75.389

Explanation:

Calculate the pressure exerted on a level ground by a man whose mass is 75kg and the area of both his feet is 280 cm2. Give your answer in Pascal (Pa)

Answers

Given:-

  • Mass = 75 kg

  • 280 cm² = 280/10000 m² = 28/1000 m²

Tobecalculated:-

Calculate the pressure exerted on a level ground.

Formulaused:-

Pressure = Force/Area

Solution:-

First of all,

We have to find out Force ;

Force = m × g

Force = 75 kg × 9.8 m/s²

Force = 735 kg.m/s² [ 1 N = kg.m/s² ]

Force = 735 N

Now,

Pressure = Force/Area

Pressure = 735 / 28/1000

Pressure = 735 × 1000 / 28

Pressure = 735000 / 28

Pressure = 26,250 Pascal

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Answers

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For instance, a heat engine is more efficient when it uses in cold weather because there is a greater temperature difference ( Carnot Efficient )
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Hope it helps I am a beginner
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