Recent content by defetey

Homework Statement A linear elastic spring is 0.15m long. When the upper end is held in the hand and a 0.5kg mass is suspended from the lower end, its length becomes 0.22m. What is the spring constant?Homework Equations E_{E}=\frac{1}{2}kx^{2} \vec{F_{spring}}=kx \vec{F_{G}}=mg E_{G}=mgh...

Homework Statement An 8 g bullet is fired into a 2.5 kg block initially at rest at the edge of a frictionless table of height 1 m. The bullet remains in the block and lands 2 m from the bottom of the table after impact. Determine the initial speed of the bullet. Answer: 1392 m/s...

But if something was between them, would it experience 10 N of force (5 from the book and 5 from the Earth)?

This is not really a homework question, just a question I came up with. If the Earth is pulling, for example, a book with a force of 5 N, that means, due to Newton's 3rd law, that the book is also pulling the Earth with a force of 5 N. Does this mean the total force between them is actually...

Yea it will take a lot longer, but the answer won't be 0 for sure though. Like I said, how could the expected payout be zero when there IS a chance they will pay SOMETHING out. That's what I've done for every other question, for http://en.wikipedia.org/wiki/Expected_value#Examples"

But that's enough to find the probabilities using a binomial distribution, isn't it? Ex, to find the probability that one passenger is overbooked: =252C241(.95)^241(.05)^11

Homework Statement The Attempt at a Solution The textbook says the answer is 0. I think they get that by saying that 5% of 240 is 12. So the plane is overbooked by 12. So there are 252 people booked on the plane. Then the binomial expectation is (252*0.95)=239.4. Which means they payout...

Homework Statement I don't have the question with me, it was on a test I did. It was something like this though: A coil is placed vertically on a table. The magnetic field there is also vertical. If the magnetic field is suddenly switched off, in which direction would the current in the...

So I'm sort of confused by voltage and I hope these will clear it up for me; 1) Why can parallel circuits only have equal voltage drops on both sides? Say a voltage of 5 is entering the parallel circuit, and one side uses 5 and the other uses 4, why is that not possible? 2) If voltage is what...

A world champion weight-lifter does 5000J of work lifting a weight from the floor to a height of 2m. What is the average force exerted on the weight? What is the mass of the weight? So I got the first part, it's 2500N. But how would I find the mass given just that much information? And for...