A 54.7 g sample of polystyrene is put into a calorimeter (see sketch at right) that contains 250.0 g of water. The polystyrene sample starts off at 88.4 °C and the temperature of the water starts off at 24.0 °C. When the temperature of the water stops
changing it's 28.5 °C. The pressure remains constant at 1 atm.
Calculate the specific heat capacity of polystyrene according to this experiment. Be sure your answer is rounded to the correct
number of significant digits.

Determine the mass of fuel required for the expected energy consumption in the united states for the next ten years. energy use per person per year in the united states = 3.5 x 1011joules base calculations on current population of 310,000,000.

What is the temperature of one mole of helium gas at stp?

Plz mark brainliest 30 points 1) find the momentum of a 12 kg snowball that is rolling with a velocity of 9 m/s. 2) an 8 ball with a mass of .5 kg is sitting at rest. it is hit by the cue ball (1 kg) traveling at 2.5 m/s. if the cue ball is at rest after the collision, how fast is the 8 ball traveling after the collision? 3) two football players are running toward each other. if the offensive player is 75 kg and is running 8 m/s, how fast must the 60 kg defensive player run in order for the two players to hit and stop?