Which of the following lists of elements includes only metalloids?

Kr, Si, Ca

B, Ge, Sb

Ge, H, Rn

As, Cl, Na

A 70 kg person lands on firm ground after jumping from a height of 3 m. What is the average force (in N) exerted on her feet by the ground if she bends her legs as she lands so that her body moves 50 cm during the impact?

Select all the correct answers. Two buses leave school moving in opposite directions. After 15 minutes, they are both 10 miles away from the school. Which statements correctly describe the motion of the buses? The velocity of the buses is equal.

An 97 kg climber climbs to the top of Mount Everest, which has a peak height of 8850 m above sea level. What is the climber's potential energy with respect to sea level

The property of matter that resists changes in motion is called inertia. friction. weight. gravity.

Which behavior is appropriate in the laboratory? handling broken glass with bare hands touching an object to see if it is hot reaching over an open flame disposing of hazardous waste in a labeled container

The circulatory system keeps the body and its tissues continuously oxygenated. It does this by having A) veins to carry both oxygenated blood to the tissues and deoxygenated blood to the lungs.

What is the "atomic mass" of an atom?

What type of energy comes from the food that we eat?

Which of the following are vector quantities? check all that apply. a. time b. displacement c. force d. mass

Imagine you are on a bus with a helium balloon tied on a string tied to the seat in front of you. the bus stops short to avoid running over a rabbit and you are thrown forward. what happens to the balloon in relation to the bus? 1. the balloon pops.