Category: Physics

Is the image in a mirror real or virtual? Key Points Reflected images can be either real or virtual. In a plane mirror, the images are virtual. The virtual images in a plane mirror have a left-right inversion. Why are real images always inverted? Real image is found when the rays of light converge at […]

Is a 50 profit margin good? You may be asking yourself, “what is a good profit margin?” A good margin will vary considerably by industry, but as a general rule of thumb, a 10% net profit margin is considered average, a 20% margin is considered high (or “good”), and a 5% margin is low. What […]

What happens if you can see yourself in a black mirror? If you’re suddenly feeling more of a distance from the image in the mirror and photos, it’s likely that you’ve had a major life change recently and your filter through which you view yourself has changed. In your eyes it’s like literally seeing a […]

What must be included in a crime scene photo? All forensic photography must consider three elements at a crime scene: the subject, the scale, and a reference object. Also, the overall forensic photographs must be shown a neutral and accurate representation. What are the 3 types of photographs that need to be taken at a […]

Why does the inner core of Earth remain solid even though it is very hot? The inner core is solid because it is made of very dense, or heavy, materials – like iron and nickel. Even though it is very hot, these materials don’t “melt” very easily, so they stay solid. Answer 3: It turns […]

Can generator be used as motor? In principle, any electrical generator can also serve as an electric motor, or vice versa. In hybrid vehicles and other lightweight power systems, a “motor–generator” is a single electric machine that can be used as an electric motor or a generator, converting between electrical power and mechanical power. How […]

What areas of the body sweat the most? The human body has approximately 2 – 4 million sweat glands found all over the body, except on the nails, ears and lips. The most concentrated area of sweat glands is on the bottom of our feet while the least concentrated area of sweat glands is on […]

What is the independent variable in a function? An independent variable is a variable that represents a quantity that is being manipulated in an experiment. In the context of a function, the independent variables are the inputs to the function and the dependent variables are the outputs of the function. … What are some examples […]

What are the 4 types of adaptations? Evolution by natural selection Behavioural – responses made by an organism that help it to survive/reproduce. Physiological – a body process that helps an organism to survive/reproduce. Structural – a feature of an organism’s body that helps it to survive/reproduce. What are adaptations examples? Examples include the long […]

Why is DAB reception so poor? Much worse – because it’s an older CODEC. Internet radio feeds will be using AAC or other more efficient CODECs. The only station which broadcasts on DAB with decent quality is Radio 3, and even that is -just- OK. Generally, assuming you’ve got internet coverage, you’re better off streaming […]