A particle of mass m is projected from point A with an initial velocity V0 perpendicular to line OA and moves under a central force F along a semicircular path of diameter OA. Observing that r0cos θ=r and using mr2dθ/dt=angular momentum, show that the speed of the particle is v=v0/cos2θ.

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

Steel is coated with a thin layer of ceramic to protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? explain.

Ariver flows from north to south at 8 km/h. a boat is to cross this river from west to east at a speed of 20 km/h (speed of the boat with respect to the earth/ground). at what angle (in degrees) must the boat be pointed upstream such that it will proceed directly across the river (hint: find the speed of the boat with respect to water/river)? a 288 b. 21.8 c. 326 d. 30.2