Q: What is the gauge pressure (in psi) at the bottom of a body of water that is 18.7 ft deep? A: Pressure in Pascals ( P ) = ( ρ )( g )( h ), where ρ is the density of the fluid medium in units of mass per unit volume ( m /Continue reading “FLUIDS: Gauge Pressure as a Function of Fluid Depth”
Author Archives: George Walker
KINEMATICS: The Speedboat Will Miss its Mark by What Distance?
A speedboat travels eastward at 80 knots (150 km/h) through a northward current of water moving 4.00m/s. Q1: What is the speedboat’s velocity vector relative to the starting port? What is the angle of travel? Q2: If the boat’s captain wanted the boat to travel due east without getting off course, how far off courseContinue reading “KINEMATICS: The Speedboat Will Miss its Mark by What Distance?”
ENERGY and MOMENTUM: What is the Final Velocity of the Ball?
Q: A 10 kg iron ball moves in an Eastward direction at 5.0 m/s. It collides with a 5.0 kg rubber ball moving Northward at 10 m/s. After the collision, the iron ball moves 60° East of North with a speed of 4.0 m/s. What is the velocity of the rubber ball after the collision?Continue reading “ENERGY and MOMENTUM: What is the Final Velocity of the Ball?”
KINEMATICS: A Leap of Faith
A man leaps off of a 12m building into a large, 4 meter tall vat of quicksand. The man leaves the roof with a horizontal velocity of 18.0 miles per hour. ( 1.000 mi/hr = 0.4470 m/s ). Q1: A robot on the ground believes that the man is going to miss his mark, andContinue reading “KINEMATICS: A Leap of Faith”
RADIANT ENERGY: Wavenumber, Angular Frequency, and the Wave Nature of Light
Trigonometric functions such as sin ( θ ) and cos ( θ ) are commonly used to model the oscillating motion of traveling waves. In the diagram above, a complete wave cycle occurs from crest-to-crest, trough-to-trough, or along the x-axis as indicated by the blue line. Since the diagram above can be modeled with theContinue reading “RADIANT ENERGY: Wavenumber, Angular Frequency, and the Wave Nature of Light”
CHEMISTRY: A Review of Molarity ( M ), Balanced Chemical Reactions, Limiting Reagents, and Quantitative Analysis
Balanced chemical reactions ( RXN ) represent reactions in which perfect ratios of reactants and products react. Let’s consider a photosynthetic RXN where glucose reacts with molecular oxygen to form carbon dioxide, water, and energy: C6H12O6 + 6O2 → 6CO2 + 6H2O + energy In the subatomic world, a single molecule of glucose reacts withContinue reading “CHEMISTRY: A Review of Molarity ( M ), Balanced Chemical Reactions, Limiting Reagents, and Quantitative Analysis”
STOICHIOMETRY: Balancing Chemical Reactions
Stoichiometry is founded upon the law of the conservation of mass. A chemical reaction’s ( RXN ) reactants and products must be balanced in such a way that a rearrangement of atoms ( or molecules ) occurs, but the total mass of atoms involved in the RXN is conserved. Let’s begin with an examination ofContinue reading “STOICHIOMETRY: Balancing Chemical Reactions”
THE BASIC STRUCTURE and FUNCTION of DNA and RNA:
DNA vs. RNA STRUCTURE Deoxyribonucleic acid ( DNA ) and Ribonucleic acid ( RNA ) enable the cells of living organisms to manufacture proteins. Proteins can exist as singular or multi-strand molecular units with very complex functions; they can be used to form structural cell wall components, neurotransmitters, enzymes, and other structures necessary for anContinue reading “THE BASIC STRUCTURE and FUNCTION of DNA and RNA:”
KINEMATICS: The ” architecture of motion. “
Q: A mass m is moving horizontally across the surface of the earth with a velocity of ( v ) = 30 m/s . The mass approaches a ledge with an edge situated 100 m above the ocean. The mass eventually moves off the ledge and falls until it reaches the ocean’s surface. Calculate theContinue reading “KINEMATICS: The ” architecture of motion. “”
CRYPTOCURRENCY AND THE ECONOMIC TRANSFORMATION OF AFRICAN COUNTRIES:
Have you every looked at money and wondered how long it has been circulating, where all it has been, and within whose hands it has travelled? Additionally, how many of us have been on the receiving end of counterfeit money that made its way through money channels without being noticed? All of the money we’veContinue reading “CRYPTOCURRENCY AND THE ECONOMIC TRANSFORMATION OF AFRICAN COUNTRIES:”
