Category: Physics

What do negative values for net torque mean? Oh, torque can be positive or negative. Let us say that a positive torque would make a stationary object rotate counter clockwise and a negative torque would make it rotate clockwise. Is a clockwise moment positive or negative? The direction of a moment is opposite to the […]

How do you add two vectors using their components? Again, the component method of addition can be summarized this way: Using trigonometry, find the x-component and the y-component for each vector. Add up both x-components, (one from each vector), to get the x-component of the total. Add up both y-components, (one from each vector), to […]

What are the basic principles of social facilitation? Social facilitation is the theory that we tend to do better on easy tasks when we know we are being watched or assessed. We do less well on more complex tasks when we know we are being observed by others. What are the effect of social facilitation? […]

Is there gravity in a vacuum? In a vacuum, gravity causes all objects to fall at the same rate. The mass of the object does not matter. If a person drops a hammer and a feather, air will make the feather fall more slowly. But if there were no air, they would fall at the […]

What can affect a compass reading? Metal that has a lot of iron in it’known as ferrous metal?can impact a compass. A large object such as a car or tower can draw the magnetized needle, making a precise reading difficult to secure. Even soil with a lot of iron in it can tweak your results. […]

What color of light has the highest frequency? Violet waves What is the depression of light? Dispersion of light is caused by the change of speed of light ray (resulting in angle of deviation) of each wavelength by a different amount. Note: White light comprises of seven visible colours (VIBGYOR) whereas black (or dark) signifies […]

Is there a weight limit for private pilots? In the US there’s no specific weight limit in the regulations. Instead, they just say that you must be capable of performing the duties of a pilot, e.g. 14 CFR 61.113: A very heavy pilot may be too heavy to fly in some smaller aircraft (including training […]

How many types of erosion are there? Like water erosion, there are three different types of wind erosion, surface creep, saltation, and suspension. What is called erosion Class 6? ​The wearing away of the earth’s surface is called erosion. Explanation: Erosion is the phenomenon of the removal of the top layer of the Earth’s surface […]

What would happen if a gamma ray hit Earth? With the gamma-rays beamed directly at Earth, the radiation would destroy a significant portion of our atmosphere, specifically the ozone layer. The photons streaming from the burst would cause chemical reactions leading to photochemical smog. This would further deplete our protection from cosmic rays. How far […]

How are the circuits wires in houses? Circuits in houses are generally wired in parallel, which allows you to operate each light or power point independently of the others. How many circuits should a house have? Fifty years ago, a kitchen might have been served by a single electrical circuit, but today, a newly installed […]