A man takes 20 seconds to climb 5 m up a ladder. He weighs 720 N. Calculate the power he must deliver to do this.

Write a short paragraph of about 150-300 words. explain how the physical environment can limit human activities.

What's erosion? a. the breakdown of rock into smaller pieces b. the removal of weathered products from rock c. a change in rock resulting from exposure to water d. a chemical change in rock that weakens it

Which of the following insects is a decomposer? a. mosquito. b. caterpillar. c. beetle. d. none of the above.