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lord [1]
3 years ago
14

Suppose that instead of being inclined to Earth's orbit around the Sun, the Moonâs orbit was in the same plane as Earthâs orbit

around the Sun. (Click "Show Moon with flat orbit" to see this situation.) In this hypothetical situation, approximately how many solar eclipses would occur each year?a) 10b) 11c) 12
Physics
1 answer:
ycow [4]3 years ago
6 0

Answer:

c) 12

Explanation:

A Solar eclipse occurs when The Sun, The Earth and The Moon comes in a straight line with the Moon being in between the Earth and the Sun. At this point the Moon appears to block the Sun and Moon's shadow falls on Earth. This would occur only on the day of the New Moon.

If the Moon's orbit was in the same plane as that of the Earth's orbit. Every new Moon, there would be a Solar Eclipse. The Lunar cycle is of 29.5 Days which means there will be one new Moon every month. So there will be 12 Solar Eclipses every year.

Currently, the orbit of the Moon is tilted at an angle of 5° thus we don't see that many Solar eclipses. Maximum of 5 solar eclipses can occur in an year.

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What is the focal length of the eye-lens system when viewing an object at infinity? Assume that the lens-retina distance is 2.0
Wittaler [7]

Answer:

Focal length of the eye-lens is 2.0 cm

Explanation:

Given:

An eye-lens system which will follow converging lens (convex lens) sign conventions and knowing that lens-retina distance is the image distance.

Object distance, u = -\infty

Image distance, v = 2.0 cm

We have to find the focal length.

Lets say that the focal length is f .

Lens Formula:

⇒ \frac{1}{f} =\frac{1}{-u} +\frac{1}{v}

Sign-convention:

We will follow the Cartesian coordinate,placing the lens at the origin of the plane, optical center is at (0,0) now as the object will be towards negative x-axis so it is negative others are on the right side of the origin so they are positive.

Using the lens formula:

⇒ \frac{1}{f} =\frac{1}{-u} +\frac{1}{v}

⇒ \frac{1}{f} =\frac{1}{-\infty} +\frac{1}{2.0}      

⇒ \frac{1}{f} =0+\frac{1}{2.0}         <em>...as </em> \frac{1}{\infty}=0 a<em>nd there is no </em>-0<em> so it is zero only.</em>

⇒ f=2.0 cm

So the focal length is 2.0 cm with two significant figures.

7 0
3 years ago
The charges on two metallic balls are 5.0 and 7.0 coulombs respectively. They are kept 1.2 meters apart. What is the force of in
Nadya [2.5K]
We know, F = k * q₁ * q₂ / r²

Substitute the known values, 
F = 9 * 10⁹ * 5 * 7 / (1.2)²

F = 315 * 10⁹ / 1.44

F = 218.75 * 10⁹ N

F = 2.1875 * 10¹¹ N   [ Final Answer ]

Hope this helps!
3 0
3 years ago
Sandy is riding a bicycle with tires that have a diameter of 650 mm. A small twig, caught in the spokes, causes the tire to clic
Minchanka [31]

Answer:

Explanation:

Sandy hears 8 such clicks every 3 seconds and a small twig, caught in the spokes, causes the tire to click once each revolution that means the wheel of the cycle is rotating at 8 rotations every 3 seconds or 8/3 rotation per second . In each rotation , it moves distance equal to its circumference .

circumference = 2π r = 2 x 3.14 x .65 / 2 m

= 2.041 m

In 8/3 rotation , distance covered = 8/3 x 2.041 = 5.44 m

So speed of cycle is 5.44 m per second

5.44 x 60 x 60 m per hour

19584 m per hour

= 19.584 km per hour .

= 20 km per hour approx.

4 0
3 years ago
A 900 kg car initially going 15 m/s only in the x-direction runs into a stationary 1500 kg truck. After the collision the car is
Shalnov [3]

Answer:

6.97 m/s, 344 degree

Explanation:

mass of car, m = 900 kg, uc = 15 m/s, vc = 5 m/s, θ = 40 degree

mass of truck, M = 1500 kg, uT = 0, vT = ?, Φ = ?

Here, vT be the velocity of truck after collision and Φ its direction above x axis.

Use conservation of momentum in X axis

900 x 15 + 1500 x 0 = 900 x 5 Cos 40 + 1500 x vT Cos Φ

13500 - 3447.2 = 1500 vT CosΦ

vT CosΦ = 6.7 .....(1)

Use conservation of momentum in y axis

0 + 0 = 900 x 5 Sin 40 + 1500 vT SinΦ

vT SinΦ = - 1.928 .....(2)

Squarring both the equations and then add

vT^2 = 6.7^2 + (-1.928)^2

vT = 6.97 m/s

Dividing equation 2 by 1

tan Φ = - 1.928 / 6.7

Φ = - 16 degree

Angle from + X axis = 360 - 16 = 344 degree

6 0
3 years ago
11 12 13 14 15 Which current is produced in homes? magnetic voltage alternating direct
Iteru [2.4K]

Answer: the answer is D) direct

Explanation:

7 0
3 years ago
Read 2 more answers
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