3. A 65 kg plastic box is sitting on a wooden incline plane. The incline plane is at a 25° angle. If the incline plane is angled up any to 25.1°, the box will just start sliding.
Please help

What is the coefficient of static friction between the box and the incline plane?

Two point charges are on the y axis. a 3.90-µc charge is located at y = 1.25 cm, and a -2.4-µc charge is located at y = −1.80 cm. (a) find the total electric potential at the origin. v (b) find the total electric potential at the point whose coordinates are (1.50 cm, 0). v

When conducting an investigation to determine which type of fertilizer produces the most flowers on a plant, which variable would be graphed on the x-axis once you collected the data? a. type of fertilizer b. amount of flowers c. amount of water d. number of days that the plants grew

Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in