Astudent on a piano stool rotates at a rate of 2.85 rev/s. the student holds a 1.25kg mass in each outstretched arm, 0.76m from the axis of rotation. the combined momment of inertia of the student and the stool without the two masses, is 5.45kg*m^2, a value that remains constant. as the student pulls his arms inward, his rate of rotation increases to 3.50 rev/s. how far are the masses from the axis of rotation at this time?

Urgent pls a. coal consumption levels off and remains flat. b. petroleum, natural gas, and renewables show an increase in consumption c. more nonrenewable resources continued to be consumed than renewable. d. there is little projected increase in nuclear energy use. e. carbon dioxide emissions are projected to decline as we approach 2040. global energy consumption is defined as the total energy used by an individual or organizations from around the world. use the graph above to analyze the projected energy consumption from now until 2040. which statements in the prompt apply? a) a, b, d b) b, c, d c) a, c, d d) a, b, c, d

If a star is moving toward earth, it is

Two 2.0-cm-diameter disks face each other, 1.0 mm apart. they are charged to ±10 nc. what is the electric field strength between the disks? a proton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?