Category: Physics

Why do plants look green in color 10? Answer: The leaves of plants contain green pigments called chlorophyll which is necessary for photosynthesis. Plants reflect green light of sunlight, so they look green. Why are some plants not green in Colour? When leaves contain high concentration of anthocyanin pigments, the leaves appear red or purple […]

What is the significance of reference point for measuring distance? A reference point is a place or object used for comparison to determine if something is in motion. An object is in motion if it changes position relative to a reference point. Objects that are fixed relative to Earth – such as a building, a […]

Can mitosis ever be used for human reproduction? In single-cell organisms, mitosis is the only form of cellular reproduction. One round of mitosis yields two genetically identical cells. This is classified as asexual reproduction because it does not require sex for the creation of new organisms. What cells does mitosis not occur in? You read […]

What does it mean when an object does not slip? It means the object moves uniformly in one direction along the surface, with no angular velocity about the object’s own center of mass. What does it mean when a ball rolls without slipping? Rolling without slipping is a combination of translation and rotation where the […]

What is shear strength test? Shear strength measures a material’s ability to resist forces that cause the material to slide against itself. A universal test machine is used to apply the tensile or compressive load to determine the overall strength of the adhesive once the samples are pulled or pushed apart. … Why is shear […]

What makes a good learning space? Muted colours, gentle lighting, comfortable seating and, when needed, screens for privacy must all be taken into account as well as making sure they are still flexible enough for the individual needs of every pupil. How does space affect learning? With responses from over 1600 educators, our study reveals […]

What is an example of contraction? A contraction is a word made by shortening and combining two words. Words like can’t (can + not), don’t (do + not), and I’ve (I + have) are all contractions. They’re so common that movies and books often try to make characters seem old-fashioned or strange by having them […]

How do I know if my refrigerator condenser is bad? Although a broken compressor is just one common problem with refrigerators, it can also be one of the most often overlooked, too. Your compressor kicking on and off is what you hear (or don’t hear) at various points during the day – you hear a […]

How does a person move forward during swimming? A person applies force on the water in backward direction and water according to the third law of motion water apply an equal and opposite force in the forward direction which helps a person to swim. How do swimmers reduce drag? Here are ten good ways to […]

How do you calculate the no load speed of a DC motor? By multiplying the velocity constant by the nominal motor voltage, obtain the theoretical no-load speed of the motor (zero torque and no-load speed) and plot it on the left vertical axis. Draw a straight line between this point and the stall torque and […]