It takes Cho 5 seconds to move a sofa 10 meters with a force of 2 N. What is Cho's power output? 50 N-m/sec
4 N-m/sec
5 N-m/sec
10 N-m/sec

Abearing is designed to a reduce friction b. support a load c. guide moving parts such as wheels, shafts and pivots d. all of the above

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

Which one of the following research methods can show cause and effect