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3 years ago

What angle is formed by the sun, the earth, and the moon during an eclipse?.

Physics

1 answer:

Andrew [12]3 years ago

4 0

Answer:

The Sun-Earth-Moon system happens to exhibit a striking geometric coincidence, which we examine in the first problem. PROBLEM 1. To an observer on Earth, the Sun and the Moon subtend almost the same angle in the sky. The average angle is 0.52 degrees for the Moon and 0.53 degrees for the Sun.

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If a heat engine takes in 4565 kJ and gives up 2955 kJ during one cycle, what is the engine’s efficiency?

vodomira [7]

The engine efficiency is 64.73 %

<u>Explanation:</u>

Given data

To find the engine’s efficiency we have the formula,

Energy input- 4565 KJ

Energy output - 2955KJ

Efficiency= energy output/ energy input ×100%

=2955/4565

=0.6473 ×100

η =64.73 %

The engine efficiency is 64.73 %

5 0

3 years ago

800 has 1 significant digit.

serg [7]

Answer:

yes, 800 has 1 significant digit

neither leading zero nor trelling zero are significant figure except when there's a decimal point

4 0

3 years ago

A toy helium balloon is initially at a temperature of T = 24o C. Its initial volume is 0.0042 m3 (It is a 10 cm radius sphere).

Anettt [7]

Answer:

$T_{f} = 335.780\,K\,(62.630\,^{\textdegree}C)$

Explanation:

Let assume that air behaves ideally. The equation of state of ideal gases is:

$P\cdot V = n\cdot R_{u}\cdot T$

Where:

$P$ - Pressure, in kPa.

$V$ - Volume, in m³.

$n$ - Quantity of moles, in kmol.

$R_{u}$ - Ideal gas constant, in $\frac{kPa\cdot m^{3}}{kmol\cdot K}$ .

$T$ - Temperature, in K.

Since there is no changes in pressure or the quantity of moles, the following relationship between initial and final volumes and temperatures is built:

$\frac{V_{o}}{T_{o}} = \frac{V_{f}}{T_{f}}$

The final temperature is:

$T_{f} = \frac{V_{f}}{V_{o}}\cdot T_{o}$

$T_{f} = 1.13\cdot (297.15\,K)$

$T_{f} = 335.780\,K\,(62.630\,^{\textdegree}C)$

7 0

3 years ago

Read 2 more answers

If cooling occurred at the bottom of a lake instead of its surface, the lake

AlladinOne [14]

No because the top has more oxygen to it which will break the particles up and have them freeze easier.

so if something froze at the bottom of the lake it would float to the top and that's why water always freezes from the top down :))

5 0

3 years ago

Read 2 more answers

A bike, a truck, and a train—all without passengers, motors, or engines—roll down the same hill. Put the vehicles in order from

Bezzdna [24]

Answer:

Train Bike Truck

Explanation:

3 0

3 years ago