Why is the Cenozoic Era important? Cenozoic Era, third of the major eras of Earth’s history, beginning about 66 million years ago and extending to the present. It was the interval of time during which the continents assumed their modern configuration and geographic positions and during which Earth’s flora and fauna evolved toward those of […]
In which of the following cases is the electric field zero but potential is not zero?
In which of the following cases is the electric field zero but potential is not zero? 1. Electric field(E)=0 but Potential(V) is not 0: The electric field is zero at a point exactly midway between two equal and similar charges but the electric potential at that point is twice than that due to a single […]
How do you know seafloor spreading?
How do you know seafloor spreading? Seafloor spreading occurs at divergent plate boundaries. As tectonic plates slowly move away from each other, heat from the mantle’s convection currents makes the crust more plastic and less dense. The less-dense material rises, often forming a mountain or elevated area of the seafloor. What is the oldest seafloor? […]
Why is surface topography important?
Why is surface topography important? Surface topography refers to both the profile shape and the surface roughness (including the waviness and the asperity or the finish). Surface topography affects the film thickness to roughness ratio and the lubrication regime. These interactions become more important as the thickness-to-roughness ratio reduces. What is topography material? The topography […]
Why thick wires are used in transformer?
Why thick wires are used in transformer? When a transformer is in operation, there are ac currents in primary and secondary coils. This is the most important for the high current winding (the secondary coil of a step-down transformer). Thick copper wire is used for this winding, because thick wire of low resistivity has a […]
What are the two major types of roller coasters?
Does Red Cross pay for platelets?
Does Red Cross pay for platelets? Platelets can only be donated at select American Red Cross Donation Centers and it requires an appointment. You will be able to provide in one platelet donation what would normally be collected from up to five whole blood donations. In fact, some platelet donations yield enough platelets for two […]
How is sound waves measured?
How is sound waves measured? Sound energy travels in waves and is measured in frequency and amplitude. Amplitude measures how forceful the wave is. Frequency is measured in the number of sound vibrations in one second. A healthy ear can hear sounds of very low frequency, 20 Hertz (or 20 cycles per second), to a […]
Can an object move without force?
Can an object move without force? Acceleration is the change of velocity per unit time, so if there is no force, all we know is that the acceleration is zero. Therefore, the velocity is not changing. If the object was already moving, then it will just keep moving. So, yes, the object can be moving […]
Do geese sleep while flying?
Do geese sleep while flying? Now, however, according to a new study from the Max Planck Institute for Ornithology, researchers have finally found evidence that birds do indeed sleep while flying. Why do birds fly in circles at sunset? Why do flocks of birds fly in a circle over the same place over and over […]