Category: Physics

What is the purpose of a ferrite bead? A ferrite bead is a passive device that filters high frequency noise energy over a broad frequency range. It becomes resistive over its intended frequency range and dissipates the noise energy in the form of heat. Is ferrite bead necessary? All good manufacturers provide ferrite beads whenever […]

What is the relation between temperature and pressure? In a closed system where volume is held constant, there is a direct relationship between Pressure and Temperature. In a direct relationship, one variable follows the same change when it comes to increasing and decreasing. For example, when the pressure increases then the temperature also increases. What […]

How has the Kyoto Protocol been successful? Successes of the Kyoto Protocol The Protocol has brought the world together to fight climate change leading to global collaborative efforts. Many nations have cut their GHG emissions, notably the European Union (Chavez, 2009). Was the Kyoto Protocol a failure? In 2001, the U.S. formally rejected the Kyoto […]

How much energy does it take to heat 1 gram of a substance 1 degree C? It requires 4.18 J of energy to change the temperature of 1 gram of liquid water by 1°C (or 1 K). How much thermal energy is required to completely melt all the ice? The equation is straightforward, so the […]

What has more water lakes or rivers? By comparison, freshwater comprises only 3% of the earth’s water, and surface water is only 0.3% of that 3%. Furthermore, rivers and lakes comprise 2% and 87%, respectively, of surface water. Thus, rivers contain only 0.00018% and lakes only 0.0078% of the earth’s water. Who has the most […]

Is ECG analog or digital? The innovators at the NASA Johnson Space Center have developed a new method and device for specialized digital to analog conversion (DAC) and reconstruction of multichannel electrocardiograms (ECGs), including 12-lead ECGs. What is the bandwidth of a normal ECG signal? The useful bandwidth of an ECG signal, depending on the […]

What describes a concave lens? A concave lens is a lens that possesses at least one surface that curves inwards. It is a diverging lens, meaning that it spreads out light rays that have been refracted through it. A concave lens is thinner at its centre than at its edges, and is used to correct […]

What are the risks of using iodine-131? I-131 collects in the thyroid gland. People exposed to I-131, especially during childhood, may have an increased risk of thyroid disease, including thyroid cancer. Thyroid cancer is uncommon and is usually curable. Typically, it is a slow-growing cancer that is highly treatable. What percentage of an original sample […]

How long does it take to build a rocket? A ‘simple’ rocket, like the falcon 9 from SpaceX, may take 18 months to make, but one that can take people into outer space, like the shuttle, can take 5 years to make, start to finish. What is a 2 stage rocket? A two-stage-to-orbit (TSTO) or […]

What are symptoms of optic nerve damage? Optic nerve damage can cause symptoms that affect the eyes and your vision, which may occur in one or both eyes including: Abnormal pupil size and nonreactivity to light. Bulging of the eyes. Complete or partial loss of vision. Diminished ability to see fine details. Diminished color vision […]