• ### If Velocity Is A measure of "Speed and Direction" ! What Does Direction Have To Do With Velocity OR Speed !?

13 answers · 4 days ago
• ### How do solar sails work?

I know what you are going to say, “google it”. But according to google, solar sails work by harnessing the light. each particle of light has momentum, and it uses these to accelerate. but i thought that momentum was equal to mass times velocity, and according to the laws of physics and einstein’s law of relativity,... show more
I know what you are going to say, “google it”. But according to google, solar sails work by harnessing the light. each particle of light has momentum, and it uses these to accelerate. but i thought that momentum was equal to mass times velocity, and according to the laws of physics and einstein’s law of relativity, photons have no mass? therefore their momentum is 0 because 0 times the speed of light is 0? i am confused, am i missing something?
13 answers · 6 days ago
• ### Theoretically, is it possible to negate the effect of time dilation when travelling fast relative to the light speed...?

9 answers · 3 days ago
• ### What is the goo that oozes out of burning leather?

I tossed some old leather boots into my fire pit this weekend and some sort of oily bubbling juice came out of the leather. It was real leather too, not the fake stuff.
I tossed some old leather boots into my fire pit this weekend and some sort of oily bubbling juice came out of the leather. It was real leather too, not the fake stuff.
5 answers · 10 hours ago
• ### If your car is stuck in the mud and you don’t have a winch to pull it out, you can use a piece of rope and a tree to do the trick.?

If your car is stuck in the mud and you don’t have a winch to pull it out, you can use a piece of rope and a tree to do the trick. First, you tie one end of the rope to your car and the other to a tree, then pull as hard as you can on the middle of the rope, as shown in the figure. This technique applies a force to... show more
If your car is stuck in the mud and you don’t have a winch to pull it out, you can use a piece of rope and a tree to do the trick. First, you tie one end of the rope to your car and the other to a tree, then pull as hard as you can on the middle of the rope, as shown in the figure. This technique applies a force to the car much larger than the force that you can apply directly. To see why the car experiences such a large force, look at the forces acting on the center point of the rope, as shown in the figure. The sum of the forces is zero, thus the tension is much greater than the force you apply. It is this tension force that acts on the car and, with luck, pulls it free. A. The sum of the three forces acting on the center point of the rope is assumed to be zero because The sum of the three forces acting on the center point of the rope is assumed to be zero because This point has a very small mass. Tension forces in a rope always cancel. This point is not accelerating. The angle of deflection is very small. B. When you are pulling on the rope as shown, what is the approximate direction of the tension force on the tree? North west east or south C. Assume that you are pulling on the rope but the car is not moving. What is the approximate direction of the force of the mud on the car? Assume that you are pulling on the rope but the car is not moving. What is the approximate direction of the force of the mud on the car? North South East or West
6 answers · 3 days ago

At some point during their orbit, the location of the Earth and Moon relative to the Sun will be as shown in the figure below. What are the magnitude, in N, and direction of the force experienced by the Moon, in degrees below the Sun-Moon line, due to the Sun and the Earth? (The mass of the Moon is 7.35 1022 kg,... show more
At some point during their orbit, the location of the Earth and Moon relative to the Sun will be as shown in the figure below. What are the magnitude, in N, and direction of the force experienced by the Moon, in degrees below the Sun-Moon line, due to the Sun and the Earth? (The mass of the Moon is 7.35 1022 kg, the Earth has a mass 5.97 1024 kg, and the Sun has a mass 2.00 1030 kg. In the figure, the distance from the Moon to the Earth is 3.84 108 m and the distance from the Moon to the Sun is 1.50 1011 m.) What is the magnitude? (N) What is the direction? degrees below the sun-moon line please help?
4 answers · 6 days ago
• ### Bernoulli (physics)?

kg / m / s²
(kg m / s²) / m²
N / m²
Pa

P + ρv²/2 = constant
v = Q/A
P + ρ(Q/A)²/2 = constant
P + 1/2 ρ Q²/A² = constant

P is a maximum when 1/2 ρ Q²/A² is a minimum, which is when A is a maximum.
kg / m / s²
(kg m / s²) / m²
N / m²
Pa

P + ρv²/2 = constant
v = Q/A
P + ρ(Q/A)²/2 = constant
P + 1/2 ρ Q²/A² = constant

P is a maximum when 1/2 ρ Q²/A² is a minimum, which is when A is a maximum.
4 answers · 24 hours ago
• ### I’m really stuck at this question- Refraction physics?

I thought that the angle of incidence and refraction were the same through a glass boundary, but the results of an experiment that the questions given me is that the angle of refraction is just over half of the angle of incidence. I don’t understand how this could be. Could someone help me please thanks
I thought that the angle of incidence and refraction were the same through a glass boundary, but the results of an experiment that the questions given me is that the angle of refraction is just over half of the angle of incidence. I don’t understand how this could be. Could someone help me please thanks
4 answers · 1 day ago
• ### A cylindrical crown glass tumbler got neatly sliced into two cylinders when I carelessly placed it on the stand. Could physics explain this?

Best answer: My thoughts are similar to philomel's Just standing part-submerged in hot water (or cold after containing hot) can cause extreme stress. You can "cut" a bottle or glass by part filling it with cold water, wrapping a piece of string around it at the same level that's wet with alcohol, then... show more
Best answer: My thoughts are similar to philomel's

Just standing part-submerged in hot water (or cold after containing hot) can cause extreme stress.

You can "cut" a bottle or glass by part filling it with cold water, wrapping a piece of string around it at the same level that's wet with alcohol, then lighting that to cause a large temperature difference in a small distance.
When it works right, the all you get is a "click" after a few seconds and the top part separates very cleanly.

A moderate temperature difference plus a minor impact to assist could cause the same thing.
4 answers · 1 day ago
• ### What exactly is a Space Force?

Best answer: They enforce speed limits on flying saucers.
Best answer: They enforce speed limits on flying saucers.
4 answers · 1 day ago
• ### How should I come onto my super hot physics professor?

29 answers · 1 week ago
• ### If you break the laws of Physics, do you go to prison?

Best answer: Life sentence, just inside the event horizon of a black hole.
Best answer: Life sentence, just inside the event horizon of a black hole.
26 answers · 1 week ago
• ### Why does a huge cloud of dust appear when something gigantic falls?

5 answers · 3 days ago
• ### When you travel very fast relative to the speed of light, time slows down on you.....?

How about if you travel faster than light using the Alcubierre Warp Drive?? What would be its temporal effect??
How about if you travel faster than light using the Alcubierre Warp Drive?? What would be its temporal effect??
6 answers · 3 days ago
• ### Is it true, if the superstring theory is right, then everything is made by the same thing at the end?

6 answers · 3 days ago
• ### Theoretically, will It be harmful to eat food which has been radiated by gamma rays?

6 answers · 6 days ago
• ### Physics 1 (Calculus-Based) Homework Help?

An automobile with tires that have a radius of 0.260 m travels 88000 km before wearing them out. How many revolutions do the tires make, neglecting any backing up and any change in radius due to wear?
An automobile with tires that have a radius of 0.260 m travels 88000 km before wearing them out. How many revolutions do the tires make, neglecting any backing up and any change in radius due to wear?
5 answers · 3 days ago
• ### Do fat, dense people matter more?

Best answer: More matter ? Yes. Matter more, No.
Best answer: More matter ? Yes. Matter more, No.
6 answers · 4 days ago
• ### Are Californians looking forward to their new severe water-use restrictions coming just FOUR years from now?

They can't be too worried about the impact, since Moonbeam is still pouring more \$billions into their bullet train to nowhere.
They can't be too worried about the impact, since Moonbeam is still pouring more \$billions into their bullet train to nowhere.
7 answers · 5 days ago
• ### If you travel on a starship at 2.5 percent relative to the speed of light for 1 day, how far into the future would you end up?

4 answers · 3 days ago