Category: Physics

Can I charge a solar panel with a light bulb? A solar cell can charge a battery from natural sunlight or from artificial lighting like an incandescent light bulb. A solar cell responds in much the same way to either kind of light; you can use incandescent light with a solar cell to charge a […]

How do you add two uncertainties? Rule 1. If you are adding or subtracting two uncertain numbers, then the numerical uncertainty of the sum or difference is the sum of the numerical uncertainties of the two numbers. For example, if A = 3.4± . 5 m and B = 6.3± . 2 m, then A+B […]

What is the rule of modern periodic table? Periodic Table: It is the table of chemical elements arranged in order of atomic number such that elements with similar atomic structure appear in the vertical columns. Modern periodic law: The Modern periodic law states “The chemical and physical properties of elements are a periodic function of […]

What is the difference between Barre and Barre3? At Barre3, you’ll find a hard dance-type floor, with mirrors, and lots of light (top) whereas Pure Barre has a carpeted studio (below) with carefully-controlled lighting that actually gets darker as you go on. How much is Barre3 a month? After the 15-day trial, Barre3 Monthly Subscription […]

What are three assumptions of the kinetic theory? The simplest kinetic model is based on the assumptions that: (1) the gas is composed of a large number of identical molecules moving in random directions, separated by distances that are large compared with their size; (2) the molecules undergo perfectly elastic collisions (no energy loss) with […]

How do you find the internal resistance of a lithium ion battery? The load current for a small battery is 1A or less; for a starter battery it might be 50A or more. A voltmeter measures the open circuit voltage (OCV) with no load, followed by the second reading with a load; Ohm’s law calculates […]

What is the easiest Leaving Cert subject? What are the easiest Leaving Cert subjects? The 10 ‘easiest’ honours. 1 Music. Music students have consistently been the most likely to receive an A, B or C at higher level in their subject over the past three years. 2 Irish. 3 Technology. 4 Spanish. 5 Maths. 6 […]

How much can a candle heat a room? One tea candle can produce around 30 watts of heat, which means that you need at least 20 to 30 tea candles to heat a very small room (and replace them every 3 to 4 hours). How much energy is in a tea candle? A standard tealight […]

What waves can pass through the ionosphere? One of the layers in the Earth’s atmosphere is called the ionosphere. Radio waves can be reflected from the ionosphere. Water is also able to reflect radio waves, but land masses are not such good reflectors. How does Kennelly Heaviside Layer affect radio communication? It reflects medium-frequency radio […]

Why is force equal to mass times acceleration? Newton’s second law is often stated as F=ma, which means the force (F) acting on an object is equal to the mass (m) of an object times its acceleration (a). This means the more mass an object has, the more force you need to accelerate it. And […]