Ques: Q: Change in what equals the average net external force multiplied by the time this force acts? Choices: - lag - height - rate - momentum A:
Ans: momentum

Ques: Q: What does every star emit that humans cannot see? Choices: - sound - light - dust - radiation A:
Ans: radiation

Ques: Q: Gas particles can move randomly in what directions? Choices: - one direction - few directions - some directions - all directions A:
Ans: all directions

Ques: Q: What layer, made of hot, solid rock, is beneath the earth's crust? Choices: - marble - core - magma - mantle A:
Ans:
mantle