The emission spectrum of the element lithium is shown below. what is the best estimate of the color that will be seen when a sample of lithium gas absorbs a lot of energy?

The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s

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?

Erosion of the beach is normally a slow process. however, in certain situations, large chunks of shore may wash out to sea. what could cause this to happen?