Category: Physics

Can coefficient of drag be negative? Drag coefficient cannot be negative in steady flow and a negative value of drag coefficient in steady flow indicates a computational error. It can however be zero in unsteady flow instantaneously. Negative drag is thrust. Why is drag negative? When drag is termed “positive”, that means that it is […]

What is Stonehenge aligned with? The sarsen stones, put up in at the centre of the site in about 2500 BC, were carefully aligned to line up with the movements of the sun. If you were to stand in the middle of the stone circle on midsummer’s day, the sun rises just to the left […]

What temperature does it need to be to sunbathe? 88° F: Perfect beach temperature. Hot enough that you have motivation to get in the water, not so hot that you bake too quickly. 90° F: Excellent sunbathing temperature. Is 25 degrees warm enough for the beach? Refreshing, but after a while it still feels too […]

What is the effect on the pressure of a gas if you simultaneously? According to the combined gas law, When we halve the pressure and double the Kelvin temperature of a gas simultaneously, then the volume of the gas will be increased by a factor of 4. Chapter 8, Problem 65AP is solved. Does water […]

What causes changes in seasons? Seasons change because of the tilt of the Earth and the planet’s movement around the Sun. Did you know? It takes about 365.25 days for the Earth to orbit the Sun. We have leap years to make up for the extra ¼ day! Why are there only two seasons in […]

How do you know if a graph is direct or inverse? Numerically: Direct Variation: Because k is positive, y increases as x increases. So as x increases by 1, y increases by 1.5. Inverse Variation: Because k is positive, y decreases as x increases. Is addition and subtraction inverse relationship? Addition and subtraction are inverse […]

What foods promote neurogenesis? Intake of flavonoids, which are contained in dark chocolate or blueberries, will increase neurogenesis. Omega-3 fatty acids, present in fatty fish, like salmon, will increase the production of these new neurons. Conversely, a diet rich in high saturated fat will have a negative impact on neurogenesis. How does neurogenesis affect memory? […]

How do you tell if a freezer is going out? Your Freezer is Freezing Over Your freezer is supposed to freeze your food not freeze itself. One of the most obvious signs of how to tell if your freezer is going out is when it’s so frozen that the door sticks or ice starts forming […]

What President passed the Newlands Reclamation Act? President Theodore Roosevelt Why is the Bureau of Reclamation so important? The Bureau of Reclamation: Manages, develops, and protects water and related resources in an environmentally and economically sound manner in the interest of the American public. What was the National Reclamation Act of 1902 mostly concerned with? […]

Which of the following has the smallest atomic radius group of answer choices? Helium What is the trend for atomic radius down a group? In general, atomic radius decreases across a period and increases down a group. Across a period, effective nuclear charge increases as electron shielding remains constant. Why does atomic radius increase as […]