Aparticle is acted on by two torques about the origin: vector tau1 has a magnitude of 1.8 n · m and is directed in the positive direction of the x axis, and vector tau2 has a magnitude of 4.8 n · m and is directed in the negative direction of the y axis. what are the magnitude and direction of dl with arrow/dt, where l with arrow is the angular momentum of the particle about the origin?

Two red blood cells each have a mass of 9.0 multiply.gif 10-14 kg and carry a negative charge spread uniformly over their surfaces. the repulsion arising from the excess charge prevents the cells from clumping together. one cell carries −2.50 pc of charge and the other −3.10 pc, and each cell can be modeled as a sphere 7.5 μm in diameter. (a) what speed would they need when very far away from each other to get close enough to just touch? assume that there is no viscous drag from any of the surrounding liquid. answer is: 321 m/s how do i find this (b) what is the maximum acceleration of the cells in part (a)? answer is: 1.38e+10 m/s2 how did they find this answer

The process in which the nucleus of an atom splits into two lighter atoms, releasing a large amount of energy is nuclear

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.