If |V1⃗⃗⃗⃗ + V2⃗⃗⃗⃗| = |V1⃗⃗⃗⃗ − V2⃗⃗⃗⃗| and V2⃗⃗⃗⃗ is not equal to zero, then which of the following statement is true?- (a) V1⃗⃗⃗⃗ and V2⃗⃗⃗⃗ are parallel (b) V1⃗⃗⃗⃗ and V2⃗⃗ are equal in magnitude,

(c) V1⃗⃗⃗⃗ and V2 ⃗⃗⃗⃗ are perpendicular to each other, (d) none of these

How is the ideal mechanical advantage of a wheel and axle calculated?

An air standard cycle with variable specific heats is executed in a closed system and is composed of the following four processes. 1-2 isentropic compression 100 kpa and 22°c to 600 kpa 2-3 v=constant heat addition to 1500 k 3-4 isentropic expansion to 100 kpa 4-1 p=constant heat rejection to initial state (a) show the cycle on p-v and t-s s (b) calculate the net work output per unit mass (409 kj/kg) (c) determine the thermal efficiency (47.9%)

Ivana walks 2km north then turns around and walks 3km south