Category: Physics

When an object of height 5 cm is placed at a distance of 20 cm in front of a concave mirror 2 times magnified real image is formed How is the image distance? Mirror formula is (1/v) + (1/u) = 1/f1/v = (1/f) − (1/u) = (−1/15) + (1/20) = −1/60 v = − 60 […]

Can Mariah Carey break glass with her voice? A human voice can shatter a glass. The human threshold for pain comes at about 120 decibels. Highly trained opera singers can sustain notes above 100 decibels. But no matter how loud the sound, if the pitch doesn’t match the resonant frequency of the glass, the glass […]

Is coastal erosion good or bad? Coastal erosion is a natural process that continually affects the Oregon coast. Erosion becomes a hazard when human development or public safety is threatened. Beaches, sand spits, dunes, and bluffs are constantly affected by waves, currents, tides, and storms, resulting in chronic erosion, landslides, and flooding. How do groynes […]

What is a volume of co2? The amount of CO2 is given in “volumes.” A volume is the space that the CO2 would take up at a pressure of one atmosphere (about 15 pounds per square inch) and at a temperature of 0 °C (32 °F) — that’s Standard Temperature and Pressure (STP). What is […]

Is coffee a weak or strong acid? Coffee often gets branded as an acidic drink, but in fact, coffee comes in at around a five on the pH scale, which is actually less acidic than drinks like beer, orange juice, and even soda. So, when we talk about acid and coffee, most often, we are […]

How does the circulatory system work while running? Exercise causes the heart to pump blood into the circulation more efficiently as a result of more forceful and efficient myocardial contractions, increased perfusion of tissues and organs with blood, and increased oxygen delivery. Aerobic exercise trains the heart to become more efficient. Can lack of exercise […]

How does an inhibitor slow down a reaction? Inhibitors. Enzyme inhibitors are compounds which modify the catalytic properties of the enzyme and, therefore, slow down the reaction rate, or in some cases, even stop the catalysis. Such inhibitors work by blocking or distorting the active site. What type of enzyme inhibitors are found? There are […]

What direction does buoyant force act? It states that any object, fully or partially immersed in a fluid, is pushed up by a buoyant force equal to the weight of the fluid displaced by the object. Buoyant force acts in the direction of the acceleration. In regards to Gravity, that would be in the upwards […]

What happens when two objects with different mass collide? In a collision between two objects, both objects experience forces that are equal in magnitude and opposite in direction. Thus, if the colliding objects have unequal mass, they will have unequal accelerations as a result of the contact force that results during the collision. What happens […]

How do humans help the water cycle? A number of human activities can impact on the water cycle: damming rivers for hydroelectricity, using water for farming, deforestation and the burning of fossil fuels. What is the importance of hydrology? Hydrology has evolved as a science in response to the need to understand the complex water […]