Recent content by a_narain

Homework Statement You have 50kg of steam at 100C, but no heat source to maintain it in that condition. You also have a heat resevoir at 0C. Suppose you operate a reversible heat engine with this system, so that the steam gradually condenses and cools until it reaches 0C. Calculate the...

Homework Statement Two cars collide as both are traveling at 90km/hr. What is the increase in temperature of the wrecks, assuming that the cars have c = 447 joules/kelvin. Homework Equations Q= mc(change in T) The Attempt at a Solution I found the joules of kinetic energy equal to...

What do you mean by the sum of their moments?

Homework Statement Three identical books of length L are stacked over the edge of a table as shown in the figure. The top book overhangs the middle one by .5L, so it just barely avoids falling. The middle book overhangs the bottom one by .25L. How far can the bottom book overhang the table...

Homework Statement A garden cart loaded with firewood is being pushed horizontally when it encounters a step 8.0 cm high, as shown in the figure. The mass of the cart and its load is 64 kg, and the cart is balanced so that its center of mass is directly over the axle. The wheel diameter is 60...