Recent content by thedarkone80

Homework Statement The capacitors in the figure are charged and the switch closes at t=0s. At what time has the current in the 8 ohm resistor decayed to half the value it had immediately after the switch was closed? (The circuit looks something like this; 2 capacitors are in series at...

no, he is pulling himself and the chair upwards, he is on a pully system. sorry for not being clear. appreciate the quick response though!

Homework Statement A man with an 70kg mass, sits on chair of 10kg, and pulls himself upwards at a acceleration of 0.2m/s^2. What is the force needed to achieve this acceleration? Homework Equations F=ma The Attempt at a Solution F=(80)*(9.81+0.2) F=(80)*(9.81-0.2) Neither are...

Homework Statement You have three strings holding a 20kg weight, all tied to a ceiling above the weight, one centered right above the weight, the other two tied to the string at equal angles. What is the tension in each of the cables Homework Equations Fnet=0 The Attempt at a Solution...

The percentage of the Earth's circumference is about 20%. But i don't understand what you have mentioned about how 5000 miles corresponds to the 360 in a circle?

Homework Statement The Earth's radius is about 4000 miles. Kampala, the capital of Uganda, and Singapore are both nearly on the equator. The distance between them is 5000 miles. Through what angle do you turn, relative to the earth, if you fly from Kampala to Singapore? Give your answer in...

In not at school, my textbook doesn't have an example of it, i just need an equation for the work.

Homework Statement A typical laboratory centrifuge rotates at 4000 rpm. Test tubes have to be placed into a centrifuge very carefully because of the very large accelerations.What is the acceleration at the end of a test tube that is 10 cm from the axis of rotation? Homework Equations No...