Category: Physics

Are force and mass are directly proportional? Newton’s second law of motion (also known as the force law ) states that… net force is directly proportional to mass when acceleration is constant. … Is weight proportional to gravity? Mass is a measure of how much material is in an object, but weight is a measure […]

How do you calculate precision? Precision is a metric that quantifies the number of correct positive predictions made. Precision, therefore, calculates the accuracy for the minority class. It is calculated as the ratio of correctly predicted positive examples divided by the total number of positive examples that were predicted. How do you find percent accuracy? […]

What is energy type signal? A signal can be categorized into energy signal or power signal: An energy signal has a finite energy, 0 < E < ∞. In other words, energy signals have values only in the limited time duration. For example, a signal having only one square pulse is energy signal. For example, […]

What is emission spectra and its types? Each source has its own characteristic emission spectrum. The emission spectrum can be divided into three types: (i) Continuous emission spectra (or continuous spectra) if the light from incandescent lamp (filament bulb ) is allowed to pass through prism (simplest spectroscope ), it splits into seven colours. What […]

What keeps a bridge from falling down? They do it by carefully balancing two main kinds of forces called compression (a pushing or squeezing force, acting inward) and tension (a pulling or stretching force, acting outward), channeling the load (the total weight of the bridge and the things it carries) onto abutments (the supports at […]

How many Earth years is a Lightyear? A light-year is the distance light travels in one Earth year. One light-year is about 6 trillion miles (9 trillion km). That is a 6 with 12 zeros behind it! What is the oldest planet in the universe? At 12.7 billion years old, planet Psr B1620-26 B is […]

Why is derating necessary? Derating increases the margin of safety between part design limits and applied stresses, thereby providing extra protection for the part. By applying derating in an electrical or electronic component, its degradation rate is reduced. The reliability and life expectancy are improved. How do you calculate derating current? Selection of cable – […]

What is used to measure plate movement? – How do scientists measure the distance that plates move? – Scientists use GPS satellites and laser technology to measure the plates movements down to the centimeter. – Laser pulses are shot from the ground to a satellite to determine the exact location of the plates. What techniques […]

What is the formula for change in internal energy? The first law of thermodynamics states that the change in internal energy of a system equals the net heat transfer into the system minus the net work done by the system. In equation form, the first law of thermodynamics is ΔU = Q − W. Here […]

How do you balance a pendulum clock? Give the pendulum a slight sideways push to start it swinging. Listen to the tick –tock. The tick and the tock should sound evenly spaced, if so the clock is said to be “in beat” or balanced. If not, the crutch at the back of the movement will […]