Acartridge electrical heater is shaped as a cylinder of length l = 200 mm and outer diameter d = 20 mm. under normal operating conditions the heater dissipates 2 kw while submerged in a water flow that is at 20°c and provides a convection heat transfer coefficient of h = 5000 w/m2 · k. neglecting heat transfer from the ends of the heater, determine its surface temperature ts. if the water flow is inadvertently terminated while the heater continues to operate, the

A33.1 g copper object is launched from a 1.5 m 30° steel incline positioned on the floor by being pulled up a string attached to a 50.0 g mass suspended vertically over a pulley. the object is projected towards a glass table where it lands when it is at the point along its trajectory with the lowest speed. it comes to a halt when it clears the opposite edge of the table. it then falls and lands on 9 physics texts each 5 cm thick that are stacked on the floor on the opposite side of the table. assume that the table does not have a ledge and the rectangular object experiences 0.05 n of air resistance as it falls towards the books. how far and how long did the object travel and how fast does it hit the books. assume that at the moment the copper object leaves the incline, the massless string and ideal pulley break off

In a vernier instrument the main scale is in 1/2 mm divisions .vernier is made by redividing 19 such divisions into 20 equal parts. calculate the least count of the instrument.

1. a net force of 100 newton’s is applied to a wagon for 5 seconds. this causes the wagon to undergo a change in momentum of