Can Bone Bend? Long bones may bend without breaking the cortex. Children’s bones can be bent to 45 degrees before the cortex is disrupted and a greenstick or a complete fracture occurs. However if the bending force is released the bone may only partially return to its pre-bent position, resulting in plastic bowing. Does vinegar […]
What happens when a wave reflects off a fixed boundary?
What happens when a wave reflects off a fixed boundary? The right end is held tightly; it is a fixed end. The wave reflects off this fixed end and returns as a downward displaced pulse. Reflection off a fixed end results in inversion. At what angle does a reflected waves bounce back? In a reflection, […]
What are the 3 types of flexibility?
What are the 3 types of flexibility? There are considered to be three main types of stretching methods for muscle flexibility. These are static stretching, dynamic stretching and proprioceptive neuromuscular facilitation (PNF). Is being too flexible bad? By repeatedly pushing past “normal” range, you’re getting micro traumas, which can lead to more serious injury, such […]
How fast is a DC motor?
How fast is a DC motor? DC controls adjust speed by varying the voltage sent to the motor (this differs from AC motor controls which adjust the line frequency to the motor). Typical no load or synchronous speeds for an AC fractional horsepower motor are 1800 or 3600 rpm, and 1000-5000 rpm for DC fractional […]
How do we use science in our everyday life?
How do we use science in our everyday life? Science informs public policy and personal decisions on energy, conservation, agriculture, health, transportation, communication, defense, economics, leisure, and exploration. It’s almost impossible to overstate how many aspects of modern life are impacted by scientific knowledge. What are 3 benefits of science? The advantages of Science and […]
Is it better to breathe through your nose or mouth when exercising?
Is it better to breathe through your nose or mouth when exercising? The nose also adds moisture and warmth to inhaled air for smoother entry to the lungs. Nasal breathing, as opposed to mouth breathing, has another important advantage, especially for effective and efficient exercise: It can allow for more oxygen to get to active […]
What determines how much load a stream can carry?
What determines how much load a stream can carry? The ability of streams to carry a load is determined by 2 factors: Competence and Capacity. Competence of a stream measures the largest PARTICLES it can transport. A stream’s competence increases with it velocity. The competence of a stream increases 4 times-when the velocity doubles. What […]
Is Absolute Zero Possible?
Is Absolute Zero Possible? Absolute zero, technically known as zero kelvins, equals −273.15 degrees Celsius, or -459.67 Fahrenheit, and marks the spot on the thermometer where a system reaches its lowest possible energy, or thermal motion. There’s a catch, though: absolute zero is impossible to reach. How do you explain thermodynamics to a child? Thermodynamics […]
Are enzymes used up in a reaction?
Are enzymes used up in a reaction? Enzymes are not reactants and are not used up during the reaction. Once an enzyme binds to a substrate and catalyzes the reaction, the enzyme is released, unchanged, and can be used for another reaction. This means that for each reaction, there does not need to be a […]
What color is the photosphere as viewed from the ground on a clear cloudless day when the sun is highest overhead?
What color is the photosphere as viewed from the ground on a clear cloudless day when the sun is highest overhead? The photosphere appears bright yellow (almost white) as viewed from the ground on a clear, cloudless day. As the Sun approaches the horizon over an ocean, the photosphere appears orange-yellow and as the Sun […]