FUN EVENING QUIZ! One type of thermostat has a metal
base plate that is attached to the surface
being heated. As a result, electrical
contacts in the thermostat are opened
and closed by expansion and contraction.
The proper operation of the thermostat
depends on heat transfer by which of the
following processes?
A. conduction
B. convection
C. radiation
D. sublimation
Reminder: This is just for fun, but I will reward the brainliest 60 points, something to keep in mind ;)

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?