3.) A 70.0 kg scuba diver in the Caribbean (she is trying to recover from final exams!!) is in the process of returning to the surface of the water after observing all the
beautiful, exotic fish. She is returning straight up to the surface at a constant 1.00
m/s. On the way up, she is using only her flippers to propel her upwards. The
water itself helps and hinders (works against) her ascent to the surface. It helps
her by providing a buoyant force on her of 650 N, but hinders her by putting a
water resistance force (analogous to air resistance) on her of 400.0 N. So, how
hard are her flippers pushing down against the water for her to make this ascent
to the surface?

Why do electron microscopes have higher resolving power than light microscopes?

Abasketball star covers 2.65 m horizontally in a jump to dunk the ball. his motion through space can be modeled precisely as that of a particle at his center of mass. his center of mass is at elevation 1.02 m when he leaves the floor. it reaches a maximum height of 1.90 m above the floor and is at elevation 0.910 m when he touches down again. (a) determine his time of flight (his "hang time"). (b) determine his horizontal velocity at the instant of takeoff. (c) determine his vertical velocity at the instant of takeoff. (d) determine his takeoff angle. (e) for comparison, determine the hang time of a whitetail deer making a jump with center-of-mass elevations yi = 1.20 m, ymax = 2.45 m, and yf = 0.750 m.

Asquare 1m x 1m plate is shown below. all four of its edges are kept at 0 co. at t=0the temperature distribution is given by: y xtsins n75)=.a) using separation of variables determine the temperature distribution t(x,y,t)along the plate at any time t.b) discretize the heat conduction equation +=22222 txtusing a second-order centered difference scheme for the two second derivatives and a first-order forward euler scheme for the first derivative. using von neumann stability analysis, determine the stability criterion for the proposed discretization scheme in terms of , hand t. solve for the maximum allowable time step tmax