Question 8

Write an equation of the line. Slope 0 ; through \( (-2,-1) \)

An unknown compound has the following chemical formula: where \( x \) stands for a whole number. Measurements also show that a certain sample of the unknown compound contains 9.6 mol of nitrogen and 9.3 mol of oxygen. Write the complete chemical formula for the unknown compound.

An unknown compound has the following chemical formula: where \( x \) stands for a whole number. Measurements also show that a certain sample of the unknown compound contains 5.4 mol of nitrogen and 10.84 mol of oxygen. Write the complete chemical formula for the unknown compound.

Draw a diagram for the following situations. Calculate the distance and displacement in each of the following situations. Include a direction (example: north or northwest) with your answer. 1. Amy runs 2 miles south, then turns around and runs 3 miles north 2. Jermaine runs exactly 2 laps around a 400 meter track 3. Derrick crawls 4 feet south, and then turns east and crawls 6 feet.

A ball of mass 0.8 kg flies through the air at low speed, so that air resistance is negligible. What is the net force acting on the ball while it is in motion? \( \vec{F}_{\text {net }}=0.8 \mathrm{~kg} \cdot 9.81 \frac{\mathrm{m}}{\mathrm{s}} 2 \) Which components of the ball's momentum will be changed by this force? y only What happens to the \( x \) component of the ball's momentum during its flight? It doesn't change. \( \hat{v} \) What happens to the \( y \) component of the ball's momentum during its flight? It decreases. \( \hat{v} x \) What happens to the \( z \) component of the ball's momentum during its flight? It doesn't change. \( \hat{v} \) In this situation, why is it legitimate to use the formula for average \( y \) component of velocity, \( v_{\text {avg, }}=\frac{v_{y i}+v_{y f}}{2} \), to update the \( y \) component of position? Check all that apply. The ball's velocity changes at a constant rate because the net force on the ball is constant. This formula for average velocity is always valid. The ball's speed is small compared to the speed of light.