Category: Physics

Does salty water stay frozen longer? Adding salt to the water before freezing lowers the freezing temperature of the water, meaning that your ice will actually be colder than frozen freshwater. Using seawater will work even better than adding your own salt to the water. Does salt water stay frozen longer than plain water? Over […]

What is the rule for adding and subtracting negative numbers? Two signs. When adding positive numbers, count to the right. When subtracting positive numbers, count to the left. When subtracting negative numbers, count to the right. What is the rule for adding negative numbers? The Rules: Rule Example +(+) Two like signs become a positive […]

What is relation between frequency and wavelength? What is the relationship between frequency and wavelength? The higher the frequency, the shorter the wavelength. Because all light waves move through a vacuum at the same speed, the number of wave crests passing by a given point in one second depends on the wavelength. What is the […]

Where does energy go when it leaves a ball? As the ball falls, that energy is converted to kinetic energy. When the ball collides with the floor, some of this kinetic energy is transferred to the floor and converted to thermal energy (friction) and elastic potential energy (ball deformation.) Why does a ball lose energy […]

What is difference between FFT and DFT? DFT or Discrete Fourier Transform is an algorithm that computes the Fourier transform of a digitized (discrete) signal. FFT (Fast Fourier Transform) is an optimized implementation of this transform. What is output of FFT? You can find more information on the FFT functions used in the reference here, […]

What is a Type B MCB used for? ‘B’ Curve MCB is used for the protection of circuits with equipment that does not cause surge current, like lighting and distribution circuits. So they are, the best fit for residential applications and domestic appliances with mainly Resistive Load. Can you mix MCB and RCBO? Yes, but […]

What best describes the shape and volume of a gas? gas: Has no definite shape or volume. change of state: When matter is converted from one of the three states (example: solid, liquid, or gas) to another state. Which of the following describes a gas? Gas is a state of matter that has no fixed […]

What is the length of a line between two point? 1. Distance between two points P(x1,y1) and Q(x2,y2) is given by: d(P, Q) = √ (x2 − x1)2 + (y2 − y1)2 {Distance formula} 2. Distance of a point P(x, y) from the origin is given by d(0,P) = √ x2 + y2. 3. Is […]

How many watts do I use a day? A small home in a temperate climate might use something like 200 kwh per month, and a larger home in the south where air conditioners account for the largest portion of home energy usage might use 2,000 kWh or more. The average U.S. home uses about 900 […]

What is most fuel efficient speed? 65mph What is the safest most fuel efficient car? Most Fuel-Efficient Cars 2021 Honda Insight. Price Range: $23,130 – $29,040. 2021 Toyota Prius. Price Range: $24,525 – $32,650. 2021 Hyundai Ioniq. Price Range: $23,400 – $38,815. 2021 Toyota Corolla. Price Range: $20,025 – $28,310. 2021 Honda Accord. Price Range: […]