An elevator cab is pulled upward by a cable. The cab and its single occupant have a combined mass of 1970 kg. When that occupant drops a coin, its acceleration relative to the cab is 8.90 m/s2 downward. What is the tension in the cable

What is the weight of a 8-kg substance in n, kn, kg·m/s2, kgf, lbm·ft/s2, and lbf?

In a classical model of the hydrogen atom, the electron moves around the proton in a circular orbit of radius 0.053 nm. what is the electron's orbital frequency? what is the effective current of the electron?

If a negatively charged particle is placed at rest in an electric potential field that increases in the positive x-direction, what will the particle do? a. accelerate in the positive x-direction b. remain at rest c. accelerate in the negative x-direction