Who said that a force is not needed to keep an object moving? Newton What is natural state of an object? Objects do not change motion without unbalanced force. Objects in motion do not always require a force to keep them moving. Objects have two “natural” states of motion, at rest (static equilibrium) and moving […]
What liquid is hardest to freeze?
What liquid is hardest to freeze? Liquid helium What affects the boiling point? The boiling point of a liquid depends on temperature, atmospheric pressure, and the vapor pressure of the liquid. When the atmospheric pressure is equal to the vapor pressure of the liquid, boiling will begin. Is it true that water boils at higher […]
What are three space explorations?
What are three space explorations? Examples of such efforts include the development of the Curiosity Mars rover, the Cassini-Huygens mission to Saturn and its moons, and the development of major space-based astronomical observatories such as the Hubble Space Telescope. What was the coolest space mission? Apollo 9 and 10 were again crewed test flights, but […]
Is calcium carbonate a ionic compound?
Is calcium carbonate a ionic compound? Calcium carbonate (CaCO3) has ionic bonding between calcium ion Ca2+ and a polyatomic ion, CO2−3, but within the carbonate ion (CO32-), the carbon and oxygen atoms are connected by covalent bonds (shown above). Why calcium carbonate has both ionic and covalent bond? Calcium carbonate is another example of a […]
Is Earth losing its atmosphere?
Is Earth losing its atmosphere? A pair of researchers from Toho University and NASA Nexus for Exoplanet System Science has found evidence, via simulation, that Earth will lose its oxygen-rich atmosphere in approximately 1 billion years. What would happen if we lost gravity? If the Earth’s gravity did just suddenly disappear we would no longer […]
What would happen if Earth had a tilt of only 5?
What would happen if Earth had a tilt of only 5? An axial tilt of only 5 degrees, however, would mean that seasonal variations would be minimal below about 80 degrees of latitude. Without these seasonal variations, the global climate would be much more uniform, but this would also cause devastation to most of the […]
How did Newton figure out gravity?
How did Newton figure out gravity? The legend is that Newton discovered Gravity when he saw a falling apple while thinking about the forces of nature. Whatever really happened, Newton realized that some force must be acting on falling objects like apples because otherwise they would not start moving from rest. Did Newton really discover […]
What is the most common way for a virus to kill a cell?
What is the most common way for a virus to kill a cell? Most viral infections eventually result in the death of the host cell. The causes of death include cell lysis, alterations to the cell’s surface membrane and various modes of programmed cell death. Some viruses cause no apparent changes to the infected cell. […]
How do you know which direction is north at night?
Can concave lens produce real image?
Can concave lens produce real image? Convex (converging) lenses can form either real or virtual images (cases 1 and 2, respectively), whereas concave (diverging) lenses can form only virtual images (always case 3). Real images are always inverted, but they can be either larger or smaller than the object. What are the properties of lenses? […]