Which of the following is a fundamental unit of the SI system of units? A) kilometer
B) joule
C) kilogram
D) gram
E) newton

Which wave is the result of amplification and produces a louder sound

Adistance-time graph indicates than an object moves 100 m in 4 s and then remains at rest for 6 s. what is the average speed of the object?

Vi. on another planet, a spring with constant 4.7 n/m is set up and allowed to expand verticaly freely. 8.4kg mass is placed on the spring and the spring extends 5.28m. calculate the exected extension on earth.