Question

Rosa uses the formula (vi cos)t to do a calculation. which value is rosa most likely trying to find?

Answer 1

Based on the given formula that Rosa uses to do a calculation, the value that Rosa is most likely trying to find is power in circuits specifically active power P in kW. Where Vi is the applied voltage and t is the input current. Hope this is the answer that you are looking for. 

Answer 2

Answer:

The horizontal displacement of a projectile launched at an angle.

Explanation:

If the formula used by Rosa is $v_i\ cos\theta$ where $v_i$ is the initial speed of the object or the velocity with which the object is thrown. There are two component of velocities i.e. horizontal and vertical. If $\theta$ is the angle with horizontal. We know that distance travelled is given by :

$d=v_i\ cos\theta \times t$

So, Rosa is finding the horizontal displacement of a projectile launched at an angle.