Recent content by pinkerpikachu

Wait, I have the density of the air and the helium switched, right? The buoyant force is due to the air and not the helium? Because the air is the fluid that it is in? This is probably an easy question, but I'm pretty sleep deprived haha

Homework Statement How many helium-filled balloons would it take to lift a person? Assume the person has a mass of 76 kg and that each helium-filled balloon is spherical with a diameter of 33 cm. Homework Equations P = P0 + ρgV The Attempt at a Solution I really don't know why this is...

I see, the two diameters are related through the common interface (the hypothenuse of the two triangles). Just some geometry from there. It makes sense, thank you :)

Homework Statement A laser beam of diameter = 3.1mm in air has an incident angle = 26 degrees at a flat air-glass surface.If the index of refraction of the glass is n=1.5, determine the diameter of the beam after it enters the glass. Homework Equations n1sinθ1=n2sinθ2 The Attempt...

Homework Statement Use the functions: y=x+1, y=0, x=0, x=2 Find the volume when rotated around y=3 Find the volume when rotated around y=-1 Homework Equations PI\int R2dx or perhaps PI\int R2 - r2dx The Attempt at a Solution i don't think that this is a particularly hard question, but I...

nevermind! totally solved my own problem!

The fictional starship Enterprise obtains power by combining matter and antimatter, achieving complete conversion of mass into energy. If the mass of Enterprise is approximately 5 X 109 kg, how much mass must be converted into kinetic energy to accelerate it from rest to one tenth the speed of...

I have very limited knowledge of taking limits. Um...is it undefined or zero? I took some notes in class, and for length contraction I have the formula and then: as v --> c, L --> 0 oh wait! I forgot there was a one in the formula. So if v^2/ c^2 is just a really small number, then 1 minus that...

Sorry, I wouldn't just ask for an answer like that if had any idea of how to solve it. Special relativity just blows my mind and I was hoping to clear up a few things in my brain with the answer to these questions. But here goes nothing: Okay. So, length contraction, the equation is...

Special relativity -- What if the speed of light was infinite? Suppose the speed of light was infinite. What would happen to the relativistic predictions of length contraction and time dilation? Okay, so I know all of this is based on the concept of the constancy of the speed of light. So...

Okay, as the aircraft approaches Saturn, its going to feel some kind of gravitational pull towards the larger body. Correct? This pull is a force which is stated as conservative. So will it have an impact on the final speed on the air craft? Will this force slow down the aircraft? I know a...

The gravitational slingshot effect. In the diagram below, the planet Saturn moving in the negative xdirection at its orbital speed (with respect to the Sun) of 9.6 km/s. The mass of Saturn is 5.96 × 1026 kg. A spacecraft with mass 825 kg approaches Saturn. When far from Saturn, it moves in the...

1. If V= 0 at a point in space, must E=0 there? If E=0 at some point must V=0 at that point? And examples for each? I'm pretty confused on both parts. I haven't really been understanding much of this electric charge/electric field stuff. I know, just from an equation at V= -Ed, but I...

A meteor whose mass was about 10^8 kg struck the Earth (m = 6.0 X 10^24) with a speed of about 15 km/s and came to rest in the earth. A) what was the Earth's recoil speed? B) what fraction of the meteor's KE was transformed into KE of the earth? C) By how much did the Earth's KE change as a...

its one by my professor. hm...sorry I can't make you understand it. one more try: There is a rollercoaster car, it order for it to complete a loop its wheels have to have a certain static friction coefficient at a certain velocity. Taking into count all of the forces on the coaster...