Category: Physics

What devices are used for measuring atmospheric pressure and wind speed? A barometer is a scientific instrument used in meteorology to measure atmospheric pressure. A simple barometer consists of a long glass tube (closed at one end, open at the other) filled with mercury and turned upside down into a container of mercury. What instruments […]

Is voltage is directly proportional to resistance? Ohm’s law Equation tells us that the current in a circuit can be determined if the values of resistance and voltages are known. Therefore, voltage is not proportional to resistance. Why ammeter has low resistance and voltmeter has high resistance? It must be placed in series with the […]

What is the driving force for blood flow? Mean arterial pressure is the force that drives the flow of blood through the circulatory system. Which instrument is used for measurement of blood flow? Blood flow measurement devices are divided into ultrasonic Doppler blood flow meters, laser Doppler blood flow meters and electromagnetic blood flow meters […]

What do you know about the Milky Way? The Milky Way is a large barred spiral galaxy. All the stars we see in the night sky are in our own Milky Way Galaxy. These stars form a large disk whose diameter is about 100,000 light years. Our Solar System is about 25,000 light years away […]

What happens when tryptophan is present? When tryptophan is present in the cell, two tryptophan molecules bind to the trp repressor, which changes shape to bind to the trp operator. Binding of the tryptophan–repressor complex at the operator physically prevents the RNA polymerase from binding and transcribing the downstream genes. What time should I take […]

What do water ice and steam have in common? When water freezes, its molecules move farther apart, making ice less dense than water. This means that ice will be lighter than the same volume of water, and so ice will float in water. As some of the water vapor cools, we see it as a […]

What is a good title for a lab report? The title says what you did. It should be brief (aim for ten words or less) and describe the main point of the experiment or investigation. An example of a title would be: “Effects of Ultraviolet Light on Borax Crystal Growth Rate”. If you can, begin […]

How do you find the speed of a molecule? RMS Speed of a Molecule v rms = v 2 – = 3 k B T m . v rms = v 2 – = 3 k B T m . The rms speed is not the average or the most likely speed of molecules, as […]

What do you mean by efficiency of simple machine is 60%? By the statement, Efficiency of a machine is 60% , it is meant that ‘The work output is 60% of the work input’. If you apply 100J of energy for a machine, it will be able to life load of 60 J only. Is […]

What does snow do to trees? Excess snow can damage trees and woody shrubs by bending, breaking and splitting them or causing them to fall or uproot. Whether woody plants will be damaged in one of these ways depends upon several factors. Coniferous evergreens, for instance, can bear more snow weight than broadleaf evergreens. What […]