Category: Physics

What are the units of contraction in a muscle called? The unit of contraction in a muscle cell is called Sarcomere. Is a fascicle a motor unit? Motor Unit Anatomy A skeletal muscle fascicle consists of 20 to 60 fibers surrounded by a connective tissue sheath. A single muscle fiber is innervated by only one […]

What is the scientific method for identification? The acronym for a scientific method: Analysis, Comparison, Evaluation, and Verification (see individual terms). The acronym for Automated Fingerprint Identification System. The first step of the ACE-V method. The assessment of an impression to determine suitability for comparison. How do I know if I have systemic issues? We […]

What is load measured in? The resistance (R) of a resistive load is measured in Ohms (Ω) and the power is measure in Watts (W). How big of a beam do I need to span 12 feet? When supporting joists that span 12 feet with no overhang beyond the beam, a double ply beam can […]

How do you describe a line of reflection? A reflection is a transformation representing a flip of a figure. When reflecting a figure in a line or in a point, the image is congruent to the preimage. A reflection maps every point of a figure to an image across a fixed line. The fixed line […]

How can we determine the size of the Earth? It was generally agreed upon that measuring the size of Earth could be done by measuring the altitude of a star from two cities situated on the same meridian. Then, a difference expressed in degrees would be found. How is the Earth’s curvature measured? How could […]

Which two points on the wave are out of phase? The wavelength of a wave is the distance between any two adjacent points that are in phase. Points that are not in phase, those that are not separated by a complete number of wavelengths, are called out of phase. Examples of points like these would […]

How many hours should AC run per day? A properly sized system should run non stop for 24 hours on the hottest day of the year. Well it should run the entire time that the peak load is occuring . This may be for 8 hours or so but will not be for 24 hours. […]

Can a Boeing 747 break the sound barrier? As it shot across the Atlantic, the Boeing 747-400 jet reached a top ground speed of 825 mph. However, the jet did not actually break the sound barrier, because that is measured by its airspeed, or the speed of the plane relative to the air through which […]

Is wood a good energy source? Wood is considered humankind’s very first source of energy. Today it is still the most important single source of renewable energy providing about 6 percent of the global total primary energy supply. Wood energy is also an important emergency backup fuel. … What is the majority of wood used […]

What is Catenation explain with reference to group 14? The property of self-linking of atoms of an element through covalent bonds to form straight or branched chains and rings of different sizes is called catenation. Amongst the group 14 elements, C-C bond strength (355 kJ mol1) is maximum, therefore, carbon shows maximum tendency for catenation. […]