What is a control group in an experiment? Control group, the standard to which comparisons are made in an experiment. A typical use of a control group is in an experiment in which the effect of a treatment is unknown and comparisons between the control group and the experimental group are used to measure the […]
Why do potatoes hold heat so well?
Why do potatoes hold heat so well? Potatoes contain a lot of water, and thus have a high specific heat capacity. They are also rather dense (basically a solid blob of carbohydrates), which doesn’t allow heat from the center to dissipate as quickly. Is potato water good for anything? Potato water is the water that […]
What does the skater physically do to make themselves spin faster or slower?
What does the skater physically do to make themselves spin faster or slower? The principle of the conservation of angular momentum holds that an object’s angular momentum will stay the same unless acted upon by an outside force. This explains why a figure skater spins faster when she tucks her arms in close to her […]
What is called dynamo effect?
What is called dynamo effect? Dynamo Effect. The dynamo effect is a geophysical theory that explains the origin of the Earth’s main magnetic field in terms of a self-exciting (or self-sustaining) dynamo. The electric current, in turn, produces a magnetic field that also interacts with the fluid motion to create a secondary magnetic field. What […]
What are the 2 types of diver down flags?
What are the 2 types of diver down flags? Locally recognized – There are two recognized dive flags – a red flag with a white diagonal stripe, and the blue-and-white pennant tail Alpha flag. Know which flag to fly in your local area. Which marker indicates safe water? Safe water markers have red vertical stripes […]
What is the possible drawback to direct?
What is the possible drawback to direct? The drawback could be that the minority don’t like the policy that the People choose for their nation. It can be resolved by lobbying a majority to change it, or by moving to another nation-state and thereby “voting with one’s feet.” What are the advantages of direct rule? […]
Which soil has highest porosity?
Which soil has highest porosity? Clay What increases the porosity of soil? Usually, this is as simple as thoroughly mixing in organic material such as peat moss or garden gypsum to increase soil porosity. What are the factors that affect porosity? On the whole, porosity is directly dependent on the initial water content, temperature, pressure, […]
What causes perturbation?
What causes perturbation? Gravitational attraction is a main cause of perturbations. In the solar system, for example, the primary motion of planets and comets in their elliptical orbits is due to the sun. Perturbations are due to the attraction of the various other members of the system for each other. What is perturbation effect? Perturbation […]
What is the difference between SX and ox?
What is the difference between SX and ox? In other words, σx is the exact standard deviation of the data given (with n in the denominator), and sx is an unbiased estimation of the standard deviation of a larger population assuming that the data given is only a sample of that population (i.e. with n-1 […]