wo frictionless carts are on a horizontal track. The first cart is initially at rest, and has a mass of 0.500 kg. It has a massless spring for a bumper (with spring constant 400 N/m). The second cart (mass of 0.800 kg), heads towards it from the left with a velocity of 2.00 m/s. a) What speed do the two carts have when they are travelling at the same speed

The vapour pressure of benzene is 53.3 kpa at 60.6 °c, but it fell to 51.5 kpa when 19.0 g of a non-volatile organic compound was dissolved in 500 g of benzene. calculate the molar mass of the compound.

Amerry-go-round of radius r, shown in the figure, is rotating at constant angular speed. the friction in its bearings is so small that it can be ignored. a sandbag of mass m is dropped onto the merry-go-round, at a position designated by r. the sandbag does not slip or roll upon contact with the merry-go-round. how would you rank the following different combinations of m and r on the basis of the angular speed of the merry-go-round after the sandbag "sticks" to the merry-go-round from largest to smallest. a) m = 10kg, r = 0.25r b) m = 20kg, r = 0.25r c) m = 10kg, r = 0.50r d) m = 10kg, r = 1.0r e) m = 15kg, r = 0.75r f) m = 40kg, r = 0.25r

Provides most of the energy used in the world today. question 4 options: wind fossil fuel moving water sunlight