The 2-kg block is subjected to a force having a constant direction and a magnitude F = (300/(1 + s)) N, where s is in meters. When s = 4 m, the block is moving to the left with a speed of 8 m/s. Determine its speed(m/s) when s = 12 m. The coefficient of kinetic friction between the block and the ground is μ k = 0.25.

Occurs when an energy source transfers heat directly to another subject space; an example would be an object becoming warm by sitting in the sunshine

What is the mass of the same rock on the earth

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)