PHYSICS HIGH SCHOOL

Why can u see the planets at night

Answers

Answer 1

Answer: Reflection off of the sun/moon.

Answer 2

Answer:

Answer:

stupid question

Explanation:

Related Questions

an suv is traveling at a speed of 18 m/s. If the suv has a mass of 1,550 kg, what force must be applied to stop it in 8 seconds?
A force of 20 N is executed to raise a rock weighing 30 N. What is the actual mechanical advantage?
earth were now in synchronous rotation with the moon? that is, suppose that earth rotated at the same rate that the moon orbits earth. what would be differ-ent about earth and life on it?
_____________ was a popular technique used by animator, Tim Burton. With this animation technique, objects/puppets are made by the artist, and each time they are moved, the artist photographs them instead of drawing them.a. Cel animationc. Projecting animationb. Computer Generated Imageryd. Stop motion animation
A pillow is thrown downward with an initial speed of 6 m/s.After 4 seconds, the pillow's velocity is m/s. (g= -9.8m/s2)

A radio station has a frequency of 90.9 megahertz (9.09 × 10^7 Hz). What is the wavelength of the radiowaves the station emits from its radio tower?

Answers

well it depends of the distance, but u get your frequency and u times it by a round number if im correct

Answer:

well it depends of the distance, but u get your frequency and u times it by a round number if im correct

Explanation:

An object of unknown mass is initially at rest and dropped from a height h. It reaches the ground with a velocity v sin θ / g 1. The same object is then raised again to the same height h but this time is thrown downward with velocity υ1 It now reaches the ground with a new velocity υ2. How is v2 related to v1?

Answers

Answer:

$v^(2)_(2)=v^(2)_(1)+(v^(2)Sin^(2)\theta )/(g^(2))$

Explanation:

Case I:

initial velocity, u = 0 m/s

Final velocity, v' = v Sinθ /g

Height = h

acceleration = g

Use third equation of motion, we get

$v'^(2)=u^(2)+2as$

$\left ( (vSin\theta )/(g) \right )^(2)=0^(2)+2gh$

$h = (v^(2)Sin^(2)\theta )/(2g^(3))$ . ... (1)

Case II:

initial velocity, u = v1

Final velocity, v = v2

height = h

acceleration due to gravity = g

Use third equation of motion, we get

$v^(2)=u^(2)+2as$

$v^(2)_(2)=v^(2)_(1)+2gh$

Substitute the value of h from equation (1) ,we get

$v^(2)_(2)=v^(2)_(1)+2g(v^(2)Sin^(2)\theta )/(2g^(3))$

$v^(2)_(2)=v^(2)_(1)+(v^(2)Sin^(2)\theta )/(g^(2))$

The Milankovitch cycles may have changed Earth's climate in the past. These cycles involve _____.volcanic activity on Earth
plate tectonics
Earth's tilt and orbit
sunspots

Answers

The Milankovitch cycles describe the effects of changes in Earth's movement on the climate over a long period of time. These cycles involve variations in things such as eccentricity (orbital shape), axial tilt along with axial precession. This results in changes in the solar radiation which reaches the Earth and thus affects the climate. The correct answer is Earth's tilt and orbit.

I had a different quiz, different question, same answer:

Which of these contributes to the creation of Milankovitch cycles?

B:Changes in Earth's axial tilt

Two equal point charges QQQ are separated by a distance ddd. One of the charges is released and moves away from the other due only to the electrical force between them. When the moving charge is a distance 3ddd from the other charge, what is its kinetic energy?

Answers

Answer:

The kinetic energy K of the moving charge is K = 2kQ²/3d = 2Q²/(4πε)3d = Q²/6πεd

Explanation:

The potential energy due to two charges q₁ and q₂ at a distance d from each other is given by U = kq₁q₂/r.

Now, for the two charges q₁ = q₂ = Q separated by a distance d, the initial potential energy is U₁ = kQ²/d. The initial kinetic energy of the system K₁ = 0 since there is no motion of the charges initially. When the moving charge is at a distance of r = 3d, the potential energy of the system is U₂ = kQ²/3d and the kinetic energy is K₂.

From the law of conservation of energy, U₁ + K₁ = U₂ + K₂

So, kQ²/d + 0 = kQ²/3d + K

K₂ = kQ²/d - kQ²/3d = 2kQ²/3d

So, the kinetic energy K₂ of the moving charge is K₂ = 2kQ²/3d = 2Q²/(4πε)3d = Q²/6πεd

A mirror with a flat surface is aA. plane mirror.
B. convex mirror.
C. concave mirror.
D. virtual mirror.

Answers

This kind of a mirror is called a Plane mirror.

Other types mentioned here are not flat surfaces.

Answer:

The correct answer is option A, Plane Mirror

Explanation:

A plane mirror has a flat surface while remaining concave and convex mirror have bulging surfaces. A concave mirror is a converging mirror while a convex mirror is a diverging mirror. Having a planar surface, the angle of incidence and reflection is equal in a plane mirror. There is nothing like a virtual mirror however the mirrors have the ability to form virtual image.

Thus among all the options, option A is correct

Use the H-R diagram to answer the following questions.What is the approximate temperature of the supergiant Betelgeuse?

Which star on this diagram is the most similar to the Sun in luminosity and temperature?

Answers

Answer: The answer is 3000 K and Centauri A.

Explanation:

Just did it and got it right ♡´･ᴗ･`♡

Answer:

What is the approximate temperature of the supergiant Betelgeuse?

3000 K

Which star on this diagram is the most similar to the Sun in luminosity and temperature?

Centauri A

Other Questions

What type of data do scientists use to predict tornadoes?moisture levels and temperaturecloud cover and moisture levelscloud cover and wind flowwind flow and temperature

What is the first step in problem solving?a. gather informationc. identify the problemb. select a solutiond. examine pros and cons

A soccer player kicks a ball with a speed of 30 m/s at an angle of 10. How long does the ball stay in the air?

If a particular atom of an element has five protons a neutral atom of this element would have ________ electrons. A. 0 B. 3 C. 5 D. 8