Which of the following statements represents a scientific bias? Make sure to follow every step in the procedure.
The scale needs to be calibrated to ensure accuracy.
Clean all containers to remove residue from the previous steps.
Use data from the previous steps because they show better results.

Tom is having a problem with his washing machine. he notices that the machine vibrates violently at a frequency of 1500 rpm due to an unknown rotating unbalance. the machine is mounted on 4 springs each having a stiffness of 10 kn/m. tom wishes to add an undamped vibration absorber attached by a spring under the machine the machine working frequency ranges between 800 rpm to 2000 rpm and its total mass while loaded is assumed to be 80 kg. a) what should be the mass of the absorber added to the machine so that the natural frequency falls outside the working range? b) after a first trial of an absorber using a mass of 35 kg, the amplitude of the oscillation was found to be 10 cm. what is the value of the rotating unbalance? c) using me-3.5 kg.m, find the optimal absorber (by minimizing its mass). what would be the amplitude of the oscillation of the absorber?

Agas contained in a piston-oylinder assembly is initially at p1=100 ibf/ft^2? and occupies a volume of 3.75 ft. the gas is compressed to a pressure p2=500 ibf/ft^2 and a final volume of 0.5 ft. during the process, the relationship between pressure and volume is given as p= a +bv, where a and b are constants a)-determine the values and units for a and b b)-determine the volume, in ft, at an intermediate state where the pressure is 300 ibt/t2.

Two kg of refrigerant 134a contained in a piston-cylinder assembly is initially at 4 bar and 70°c. the refrigerant undergoes a constant pressure process to a final state of a saturated vapor. kinetic and potential energy effects can be neglected. a) show the process on a pv diagram b) determine the work for the process, in kj c) determine the heat transfer during the process, in kj