Aperson is swimming in a river with a current that has speed vr with respect to the shore. the swimmer first swims downstream (i. e. in the direction of the current) at a constant speed, vs , with respect to the water. the swimmer travels a distance d in a time tout . the swimmer then changes direction to swim upstream (i. e. against the direction of the current) at a constant speed, vs , with respect to the water and returns to her original starting point (located a distance d from her turn-around point) in a time tin . 1) what is tout in terms of vr, vs, and d, as needed?

Athin plate moves between two parallel, horizontal, stationary flat surfaces at a constant velocity of v = 7.5 m/s. the two stationary surfaces are spaced 4 cm apart, and the medium between them is filled with oil whose viscosity is 0.9 n·s/m2. the part of the plate immersed in oil at any given time is 2 m long and 0.5 m wide. if the plate moves through the mid-plane between the surfaces, determine the force required to maintain this motion. what would your response be if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top surface (h1)? if the plate moves through the mid-plane between the surfaces, the force required to maintain the motion will be n. if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top (h1) surface, the force required to maintain the motion would be n.

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

Photoelectrons with a maximum speed of 6.50 x 107 m/s are ejected from a surface in the presence of light with a frequency of 6.75 x 1014hz. if the mass of an electron is 9.10 x 10-31 kg, calculate in joules the maximum kinetic energy of a single electron. 3.84 x 10-15 j 1.92 x 10-15 j 5.92 x 10-23 j 3.07 x 10-16 j