Category: Physics

Why can we only see 50% of the Moon? One side of the moon always faces Earth. Even so, over time, it’s possible to see as much as 59% of the moon’s surface, due to lunar libration. Lunar libration lets us see more than 50% of the moon. One half of the moon always faces […]

Why do rooms echo? An echo is caused by sound waves bouncing off a hard surface so that you hear the same sound again. Large rooms in homes can create echoes, especially if the room has mostly hard, bare surfaces, high ceilings or does not have much furniture. What helps with echo in a room? […]

What is the difference between radiation and heat transfer by radiation? Convection is the transfer of energy by movement of a medium, whereas radiation is the transfer of energy by, well, thermal radiation. Conduction also requires a medium, but, again, it is a fundamentally different mechanism than either convection or radiation; in this case it […]

How do you force acceleration times? Newton’s second law of motion is F = ma, or force is equal to mass times acceleration. Learn how to use the formula to calculate acceleration. Created by Sal Khan. What are the 3 forms of acceleration? In physics, the three types of acceleration are changes in speed, direction […]

Does electricity flow through the wire around the core? An electromagnet is made by sending electric current through an insulated wire wrapped around the iron core. How does the number of winds or wire around a core affect the strength of the magnetism? Electricity gets in more, because the more winds equals more magnetism. Which […]

What is electrical energy and its formula? The energy consumed by an electric circuit to flow current through it is referred as electrical energy. This energy is provided by the battery to every electric charge. The work required to keep the charge Q in motion by the battery of voltage V is. W=VQ. What is […]

What speed is 4000 rpm? 80 mph = 4000 RPM. How do you measure driveshaft speed? To check for critical speed, calculate this equation: Top speed x 336 (a constant) x rear ratio (like 4.10), then divide it by the tire height (28” tall tire). Here is an example: Top speed is 160mph x 336 […]

What are the 2 types of machines? There are basically six types of machine: The inclined plane. – used for raising a load by means of a smaller applied force. The lever. – involves a load, a fulcrum and an applied force. The pulley. – In simplest form it changes the direction of a force […]

Is the angle of incidence is 30 What is the value of the angle of reflection? The angle between the mirror and the incident ray is 30 degrees. The sum of the angle of incidence and this angle (30) makes a right angle. So, the angle of incidence is 90 – 30 = 60 degrees. […]

What is the true bond angle of H2O? In lecture, Lavelle had mentioned that the bond angle for H2O is (104.5) less than 109.5. What is the bond angle between the oxygen atoms in the carbon dioxide molecule? 180 degrees What shape is SiS2? A.P. Chem Chapter 10 and 11 (Bonding) Review Concentration A B […]