A position versus time graph is shown. Which statement accurately describes the motion of the object in the graph above?

a) It moved from 3 cm to 10 cm at a constant speed of 2 cm/s.
b) It moved from 0 cm to 6 cm at an average speed of 1 cm/s.
c) It moved from 0 cm to 10 cm at an average speed of 2 cm/s.
d) It moved from 3 cm to 6 cm at a constant speed of 3 cm/s.

(d is incorrect btw)

A6,600 kg train car moving at +2.0 m/s bumps into and locks together with one of mass 5,400kg moving at -3.0m/s. what is their final velocity? +0.50 m/s -1.0 m/s +2.5 m/s -0.25 m/s

Asteam power plant operates on an ideal reheat rankine cycle between the pressure limits of 15 mpa and 10 kpa. the mass flow rate of steam through the cycle is 12 kg/s. steam enters both stages of the turbine at 500°c. if the moisture content of the steam at the exit of the low-pressure turbine is not to exceed 10 percent, determine (a) the pressure at which reheating takes place, (b) the total rate of heat input in the boiler, and (c) the thermal efficiency of the cycle. also, show the cycle on a t-s diagram with respect to the saturation lines. (2.15 mpa; 45.0 mw; 42.6%)

Awalk up the phase change graph worksheet