Be sure to answer all parts. calculate the mass of each of the following: (a) a sphere of gold with a radius of 12.5 cm. (the volume of a sphere with a radius r is v = (4/3)πr3; the density of gold is 19.3 g/cm3.) × 10 genter your answer in scientific notation. (b) a cube of platinum of edge length 0.049 mm (density = 21.4 g/cm3). × 10 genter your answer in scientific notation. (c) 67.1 ml of ethanol (density = 0.798 g/ml). g

2kg of refrigerant 134a undergoes a polytropic process in a piston-cylinder assembly from an initial state of saturated vapor at 2 bar to a final state of 12 bar, 80 degree c. a)determine the work for the process in kj. b)sketch the process on a p-v diagram.

An electron is ejected into a horizontal uniform e⃗ field at a parallel horizontal velocity of v0. assume the electron's initial position x0, initial velocity v0, time t, magnitude of electric field e, electron's mass m, and the magnitude of the electron's charge |e|. ignore the force that earth exerts on the electron. assume the e⃗ field is in the same direction as the initial velocity. part a define the equation for the electron's velocity. express your answer in terms of the variables v0, |e|, t, e, and m.

Match each type of lever with the correct diagram. 1. first-class 2. third-class 3. second-class