G A porous solid was brought in contact with a liquid coating. The liquid was wicked in the pores. Using the property data give below, calculate the rate of penetration at the end of 2 min. from the start assuming pores to be straight capillaries of 10 micrometer diameter. Surface tension (σlv) of liquid: 0.80 N/m, contact angle: 22°, and viscosity: 0.0035 Pa. s. Will penetration rate increase or decrease with increasing time

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?