4. A physics teacher asks their students to conduct an experiment in which they pull a block up an incline with a force sensor. The students are supposed to change the mass of the block and measure the force
of friction acting on the block. Which is the independent variable?
a. mass of the block
c. same incline
b. force of friction
d. same force sensor
e time

Which statement is true for light passing into a medium that is more optically dense than the first medium through which it past

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

The smallest particle of an element that retains its identity in a chemical reaction. true or false