During a hurricane a large tree limb, with a mass of 22.0kg and a height of 13.3 m above the ground, fell on a roof that was 6.0m above the ground. Assuming ME is conserved find the kinetic energy of the limb when it reaches the roof and its velocity.

Aparticle travels in a circular orbit of radius 21 m. its speed is changing at a rate of 23.1 m/s2 at an instant when its speed is 37.2 m/s. what is the magnitude of the acceleration (in m/s? ) of the particle?

Imagine you work as a consultant, and your daily job involves listening to the constructive criticism of others. as part of your job, you must listen to opposing viewpoints to make important decisions. in this activity, you are a consulting dam engineer. you must make a decision about four different dams; should they be repaired, taken down, or left alone? you will listen to contrasting opinions about what should be done with the dams before you make the final decision. as the consulting dam engineer, what do you decide to do with this dam? explain your reasoning. by making your decision, did you support the opinions of the mayor and/or the dam safety official? why or why not? (site 1)

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?