Has a spacecraft ever landed on an asteroid? Yes, on February 12, 2001 flight controllers landed NASA’s NEAR spacecraft on an asteroid called Eros. NEAR was the first spacecraft to orbit and touchdown on the surface of an asteroid. NEAR began orbiting Eros a year earlier, on February 14, 2000. How did NASA land on […]
What causes a change in pitch?
What causes a change in pitch? Pitch is related to frequency. Changing the number of vibrations per second changes the pitch. Shorter prongs produce higher pitch (frequency) sounds than longer prongs. Long prongs will bend more readily and therefore tend to vibrate at a lower frequency when struck. What happens when a siren kisses you? […]
What is a device that uses electricity and magnetism to create motion?
What is a device that uses electricity and magnetism to create motion? Answer: A device that uses electricity and magnetism to create motion is called a motor . What is the major similarity between a galvanometer and a simple electric motor? Galvanometers and electric motors are both based on the same basic principle of an […]
Who said democracy is the tyranny of the majority?
Who said democracy is the tyranny of the majority? In 1831 an ambitious and unusually perceptive twenty-five-year-old French aristocrat visited the United States. Alexis de Tocqueville’s official purpose was to study the American penal system, but his real interest was America herself. What is democratic despotism *? Democratic despotism is hazardous. It is not related […]
Why does red light not eject photoelectrons?
Why does red light not eject photoelectrons? It is a measure of the maximum kinetic energy of the electrons emitted as a result of the photoelectric effect. What Lenard found was that the intensity of the incident light had no effect on the maximum kinetic energy of the photoelectrons. Red light does not eject photoelectrons […]
How does excitation and emission work?
How does excitation and emission work? Explore how an electron absorbs energy and transcends to a higher energy state according to a Jablonski energy-level diagram. Once an electron is in the excited state, it slowly relaxes through vibrational effects and can then drop back to the ground state by emitting a photon (fluorescence). What is […]
What are features of federalism?
What are features of federalism? The salient features of federalism include the existence of dual government at the central and state level, separation of powers, rigid and written constitution, supremacy of the constitution, independence of judiciary, etc. Provide for a comparison between Indian federalism and the USA federalism. What are the three features of federalism? […]
Which of the following forces does not obey inverse square law?
Which of the following forces does not obey inverse square law? Reason : Nuclear force do not obey inverse square law. Does strong nuclear force obeys inverse square law? No, neither the strong nuclear force nor the weak nuclear force follow the inverse square law. The weak nuclear force is a Yukawa-type force. Such a […]
What are the two types of strain gauges?
What are the two types of strain gauges? The following different kind of strain gauges are available in the market: Linear strain gauges. Membrane Rosette strain gauges. Double linear strain gauges. Full bridge strain gauges. Shear strain gauges. Half bridge strain gauges. Column strain gauges. 45°-Rosette (3 measuring directions) What is sensitivity of strain gauge? […]
How long do pneumatic cylinders last?
How long do pneumatic cylinders last? The metal seal construction with low operating resistance allows actuation in speed and output control ranges that are impossible for ordinary cylinders. The MQM offers long life expectancy of 10,000km or 100 million full cycles. How do you calculate the stroke length of a pneumatic cylinder? Air Flow Required […]