A sign is hammered into a tree 2 m from the trees base. If the tree is 10 m tall and

Introductory Chemistry 5
To what volume should you dilute 25 mL of a 12 M stock HCl solution to obtain a 0.500 M HCl solution?

Introductory Chemistry 5
What is the difference between a strong acid and a weak acid?

An Introduction to Thermal Physics 1
Problem 32P Find an expression for the entropy of the two-dimensional ideal gas considered in below Problem. Express your result in terms of U, A, and N. Problem: Consider an ideal monatomic gas that lives in a two-dimensional universe (flatland), occupying an area A instead of a volume V. By followi

Chemistry: A Molecular Approach 3
Use the HendersonHasselbalch equation to calculate the pH of each solution. a. a solution that is 0.135 M in HClO and 0.155 M in KClO b. a solution that contains 1.05% C2H5NH2 by mass and 1.10% C2H5NH3Br by mass c. a solution that contains 10.0 g of HC2H3O2 and 10.0 g of NaC2H3O2 in 150.0 mL of so

Anatomy & Physiology 1
A molecule of ammonia contains one atom of nitrogen and three atoms of hydrogen. These are linked with ________. a. ionic bonds b. nonpolar covalent bonds c. polar covalent bonds d. hydrogen bonds

College Physics for AP® Courses 1
A number of amusement parks have rides that make vertical loops like the one shown in Figure 6.33. For safety, the cars are attached to the rails in such a way that they cannot fall off. If the car goes over the top at just the right speed, gravity alone will supply the centripetal force. What other

Principles of Economics 6
Give three examples of important trade-offs that you face in your life.

College Physics: Explore and Apply 2
A 0.62-kg Slinky has 185 coils. When you and your friend stretch the Slinky by exerting a 2.0-N force on its ends, the separation between the adjacent coils is 7 cm. Determine the speed of the transverse wave on the Slinky.