Abox is lowered using a rope. if the acceleration of the box, is 2.5 m/s2 (downward) and the tension in the rope is 31 n, what is the mass of the box (in kg)?

Why is alternating current more effective at long–distance travel than direct current? a. the power lines are made out of conductors. b. transformers increase or decrease voltage as needed. c. the ac generator is more efficient. d. ac has lower voltage than dc.

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

The system is released from rest with the cable taut, and the homogeneous cylinder does not slip on the rough incline. determine the angular acceleration of the cylinder and the minimum coeffi cient s of friction for which the cylinder will not slip.