A train travels a 400-km route and makes five stops in seven hours. Which equation is used to calculate the train’s average speed? A.
Average speed = Sum of instantaneous speeds

B.
Average speed = Total distance x Total time

C.
Average speed = Total distance + Total time

D.
Average speed = Total distance ÷ Total time

Convection currents are caused by differences in what two things?

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

During a car accident, a 125kg driver is moving at 31m/s and in 1.5s is brought to rest by an inflating air bag. what is the magnitude of the change in momentum to the driver