Afarmhand attaches a 25-kg bale of hay to one end of a rope passing over a
frictionless pulley connected to a beam in the hay barn. another farmhand then
pulls down on the opposite end of the rope with a force of 277 n. ignoring the
mass of the rope, what will be the magnitude and direction of the bale's
acceleration if the gravitational force acting on it is 245 n?

Explanation:

Newton's second law:

∑F = ma

277 N − 245 N = (25 kg) a

a = 1.28 m/s²

absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas.

emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.

explanation:

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle