In the bohr model, what is the ratio of its kinetic energy to its potential energy?

The man fires an 80 g arrow so that it is moving at 80 m/s when it hits and embeds in a 8.0 kg block resting on ice. how far will the block slide on the ice before stopping? a 7.1 n friction force opposes its motion.

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

Truck traveling west on the highway experiences an acceleration to the east. what could be the cause of this acceleration