Rosita is planning an investigation to determine how a lifeboat's shape affects its ability to carry passengers. She notices she has made an error in her data table
below. What does she need to change in her table to make her investigation a
controlled experiment?
Boat
Size and area of aluminum
foil
10 cm x 30 cm = 300 cm?
Shape of boat
1
rectangular
2
10 cm x 30 cm = 300 cm?
oval
3
20 cm x 30 cm = 600 cm?
square
4
20 cm x 30 cm = 600 cm?
triangular

What are the two (02) benefits, which may result from a successful implementation of preventive maintenance (pm) program in an organization? (clo3)a)- lean manufacturing b)-overlapping responsibilities c)-the planner is not qualified d)-accurate contractor information e)-reduction in equipment redundancies f)-accurate stores information

Derive the correction factor formula for conical nozzle i=-(1+ cosa) and calculate the nozzle angle correction factor for a nozzle whose divergence hal-fangle is 13 (hint: assume that all the mass flow originates at the apex of the cone.

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.