An unknown mineral is scratched by a penny. it must a: be talc b: have a mohs hardness of 10 c: be softer than a diamond d: have perfect cleavage

True or false: the cycle of seasons on the earth is caused by the tilt of the earth on its axis toward and away from the sun.

What is a good example of instantaneous speed

Ahanging spring stretches by 35.0 cm when an object of mass 450 g is hung on it at rest. in this situation, we define its position as x = 0. the object is pulled down an additional 18.0 cm and released from rest to oscillate without friction. what is its position x at a moment 84.4 s later? express your answer in cm.