Recent content by sushichan

Homework Statement A marble rolls from the top of a big sphere. What is the angle θ when the marble is about to leave the sphere? Assume a zero speed at the top. Homework Equations The question came from the chapter Mechanics - circular motion. The Attempt at a Solution I can't conceive what...

okay thanks!

Homework Statement A bungee jumper of mass 60kg jumps from a bridge 24 m above the surface of the water. The rope is 12 m long and is assumed to obey Hooke's law. What should the spring constant of the rope be if the woman is to just reach the water? Homework Equations Ep=mgh E=1/2 kx^2 The...

Homework Statement Prove that (n2+3)(n2+15) is divisible by 32 for all odd positive integers n. Homework Equations I suppose we are supposed to use mathematical induction since it is in that chapter, but the following questions specifically state that we should use induction but this question...

Homework Statement [/B] 14. Two positive point charges of magnitude Q and 9Q are a distance d apart, as shown in Figure 2.22 (image attached). a) Calculate the electric field strength at point P, a distance d/4 from Q. A third positive point charge is placed at P and is then displaced a bit to...

Thank you! I re-did the question where the equation for my first plane is 2x - y + 6z = 17 and I got the answer :D

(1-x)^-4 = (-(x-1))^-4 = (-1)^-4 * (x-1)^-4 = (x-1)^-4

Just a question from me: how do you enter an equation? And notice that (1-x)^(-4)/(-4) does not equal to the two terms beside it. Basically you did two mistakes that made the sign change twice. [(1-x)^-4 = (x-1)^-4]

Homework Statement (I did not copy the problem statement, but basically solve the system of equations if there is solution and give a geometrical interpretation) P1: 2x - y + 6z = 7 P2: 3x + 4y + 3z = -8 P3: x - 2y - 4z = 9 Homework Equations Scalar triple product: n1⋅(n2 × n3) The Attempt...

Thank you all, I know how to solve it now ^^ It's just funny I don't see this formula in the textbook.

Homework Statement A string is held under tension, with both ends fixed, and has a fundamental frequency of 250 Hz. If the tension is doubled, what will the new frequency of the fundamental mode be? Homework Equations The Attempt at a Solution I don't know how tension can affect the equation...

How is knowledge in physics produced? When I think about how Newton's First Law of Motion was produced, it first came from intuitive thought experiment due to the observations made. Can one actually observe an object moving with a constant velocity without any force acting on it? Or is reason...

About myself! I am a girl who studies International Baccalaureate in Stockholm. Our physics teacher's name is Paul Davis and it would be funny if I would meet him here. Ask my any questions if you want to know more about me haha.