Who are the only two players in the box during a penalty kick? The goalie and the penalty kick taker are the only players allowed in the penalty area until the kick is taken. They have to make split second decisions as the shot is being taken. Where will the kick be placed and how […]
Is it safe to zipline?
Is it safe to zipline? Researchers at Ohio State University found that almost 12 percent of zip-line injuries resulted in fractures or other injuries requiring hospitalization, making zip-lining mishaps at least as serious as rock climbing. Has anyone died on a zipline? There have been fatal zip-line crashes in the U.S., including two in Utah, […]
Why is hemoglobin so important?
Why is hemoglobin so important? Hemoglobin is essential for transferring oxygen in your blood from the lungs to the tissues. Myoglobin, in muscle cells, accepts, stores, transports and releases oxygen. What organ makes hemoglobin? Hemoglobin is produced in bone marrow by erythrocytes and is circulated with them until their destruction. It is then broken down […]
Can machine change the direction of force?
Can machine change the direction of force? Machines make work easier by increasing the amount of force that is applied, increasing the distance over which the force is applied, or changing the direction in which the force is applied. That’s because a machine doesn’t change the amount of work and work equals force times distance. […]
How entropy is a measure of disorder?
How entropy is a measure of disorder? Because work is obtained from ordered molecular motion, the amount of entropy is also a measure of the molecular disorder, or randomness, of a system. The concept of entropy provides deep insight into the direction of spontaneous change for many everyday phenomena. Does entropy mean disorder? Entropy is […]
How do you interpret a negative Pearson correlation?
How do you interpret a negative Pearson correlation? Negative Correlation A negative (inverse) correlation occurs when the correlation coefficient is less than 0. This is an indication that both variables move in the opposite direction. In short, any reading between 0 and -1 means that the two securities move in opposite directions. What is negative […]
What do you get when you reverse an exothermic reaction?
What do you get when you reverse an exothermic reaction? If the forward reaction is exothermic the reverse reaction will be endothermic, and if the forward reaction is endothermic the reverse reaction will be exothermic. A reaction that produces no change in temperature in an insulated container is said to be athermal. What is forward […]
What is the difference between dynamics and kinematics?
What is the difference between dynamics and kinematics? Traditionally, motion studies have been divided into two categories: kinematics and dynamics. Kinematics is the study of motion without regard to forces that cause it; dynamics is the study of motions that result from forces. What are kinematic properties? To describe motion, kinematics studies the trajectories of […]
Is isolated ground necessary?
Is isolated ground necessary? An isolated ground, if installed correctly, can reduce some electrical noise. However, complete power conditioning and protection usually requires additional devices such as a surge protector or an uninterruptible power supply. If the receptacle is not installed correctly, it can create a dangerous installation. What is the difference between a grounded […]
Is there a natural law?
Is there a natural law? Natural law holds that there are universal moral standards that are inherent in humankind throughout all time, and these standards should form the basis of a just society. Human beings are not taught natural law per se, but rather we “discover” it by consistently making choices for good instead of […]