Question 19 of 25 Which of the following is an engineer's solution to a problem?
O A. Searching for the existence of planets around a distant star
B. Designing shatter-resistant windows for a car
C. Observing the reaction when two substances are combined
O D. Recording species of plants that inhabit an island

Please help

Ascrew incorporates which other simple machine? lever wheel and axle inclined plane pulley

Aperson stands on a platform, initially at rest, that can rotate freely without friction. the moment of inertia of the person plus the platform is ip. the person holds a spinning bicycle wheel with its axis horizontal. the wheel has moment of inertia iw and angular velocity ωw. take the ωw direction counterclockwise when viewed from above. part a what will be the angular velocity ωp of the platform if the person moves the axis of the wheel so that it points vertically upward?

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?