Kayak A is initially at rest and then person B leaps off the kayak A with a relative velocity vB/A and lands in kayak C with person D. Each kayak has a mass of 40 kg, the mass of person B is 30 kg and the mass of person D is 25 kg. After person B leaves kayak A, the velocity of kayak A is 1.86 m/s to the left. After person B lands in kayak C the velocity of kayak C is 0.44 m/s to the right. Assuming the kayaks will not displace in the y direction, determine:.

The specific heat of silver is 0.057 calories/gram°c. if 10.0 grams of silver were heated and the temperature of the sample changed by 20.0°c, how many calories of heat energy were absorbed by the sample?

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)

Can someone answer my last question i posted? on my last post? my hw is due tomorrow and i’m confused.