Category: Physics

Is the Earth losing angular momentum? Although its kinetic energy decreases, its potential energy increases by a larger amount, i. e. Ep = -2Ec (Virial Theorem). The rotational angular momentum of Earth decreases and consequently the length of the day increases. Would the Earth spin faster without the moon? Without a moon, Earth would spin […]

What is the formula for vector addition? To add or subtract two vectors, add or subtract the corresponding components. Let →u=⟨u1,u2⟩ and →v=⟨v1,v2⟩ be two vectors. The sum of two or more vectors is called the resultant. The resultant of two vectors can be found using either the parallelogram method or the triangle method . […]

What happens when inductor is connected for a long time? If you wait long enough, the current in an RL circuit stops changing! At t=0, a capacitor acts like a wire; an inductor acts like a broken wire. After a long time, a capacitor acts like a broken wire, and inductor acts like a wire. […]

What magnification do you need to see the rings of Saturn? The rings of Saturn should be visible in even the smallest telescope at 25x [magnified by 25 times]. A good 3-inch scope at 50x [magnified by 50 times] can show them as a separate structure detached on all sides from the ball of the […]

What are the 4 types of hypersensitivity? The four types of hypersensitivity are: Type I: reaction mediated by IgE antibodies. Type II: cytotoxic reaction mediated by IgG or IgM antibodies. Type III: reaction mediated by immune complexes. Type IV: delayed reaction mediated by cellular response. What is an example of delayed hypersensitivity? Examples of DTH […]

What is a line plan? A line plan defines when a style is going to be loaded to the line, how many pieces to be expected (target) from the line and when an order to be completed. What is the best cell phone plan for 3 lines? Family Plans Mint Mobile 20. DISH. • /person. […]

How much power does a lift take? The elevator controller uses about 83 watts all the time, even when the elevator is idle. That’s about $130 per year without even moving! Going up uses almost 40 times as much power as going down. Going up 5 floors uses about 500 kilowatt seconds and costs about […]

Is it freefall or free fall? verb (used without object), free-fell, free-fall·en, free-fall·ing. (of parachutists) to descend initially, as for a designated interval, in a free fall: The jumpers were required to free-fall for eight seconds. How do you breathe in free fall? It’s often believed that you can’t breathe during a skydive, but this […]

What unit does NASA use? NASA has ostensibly used the metric system since about 1990, the statement said, but English units are still employed on some missions, and a few projects use both. NASA uses both English and metric aboard the International Space Station. Did NASA always use the metric system? Although NASA has ostensibly […]

Is P value and power the same? rests on the same idea that I reject : power and p-values measure the same thing. A statistical test contrasts two mutually exclusive propositions: H0 (the null hypothesis) and H1 (the alternative hypothesis). What does a correlation of 0.01 mean? The tables (or Excel) will tell you, for […]