Can a bubble float high into the sky? The heavier carbon dioxide in the air around the bubble pushes up on the air trapped inside the bubble and off it goes. This upward force is called “buoyancy.” If you’ve ever watched a helium balloon or blimp go soaring off into the sky, you’ve already seen […]
Does the velocity of the center of mass change?
Can you tell which element an atom is if you know its charge and the number of electrons it has?
Can you tell which element an atom is if you know its charge and the number of electrons it has? The number of protons in one atom of an element determines the atom’s identity, and the number of electrons determines its electrical charge. The atomic number tells you the number of protons in one atom […]
Is an immunologist a doctor?
Is an immunologist a doctor? An allergist / immunologist (commonly referred to as an allergist) is a physician specially trained to diagnose, treat and manage allergies, asthma and immunologic disorders including primary immunodeficiency disorders. What is being an immunologist like? What Does an Immunologist Do? Immunologists study, diagnose, treat, and help prevent immune system disorders […]
When you are climbing stairs work done by weight is positive true or false?
When you are climbing stairs work done by weight is positive true or false? There is no work being done by the ladder/stairs. The man exerts a force on the stairs but as long as the stairs don’t move, there is no energy being transferred. Work equals force times distance and this case the distance […]
What are excimer lasers used for?
What are excimer lasers used for? Excimer lasers are used, for example, in: Ophthalmology — to vaporize part of the surface layer of the cornea and thus reshape the cornea to correct refractive errors from myopia (nearsightedness), hyperopia (farsightedness), and astigmatism. Dermatology — to treat psoriasis and vitiligo. What is the basic principle of excimer […]
What is the difference between projectile and trajectory?
What is the difference between projectile and trajectory? Projectile motion is when an object moves in a bilaterally symmetrical, parabolic path. The path that the object follows is called its trajectory. Projectile motion only occurs when there is one force applied at the beginning, after which the only influence on the trajectory is that of […]
Is room temperature a controlled variable?
Is room temperature a controlled variable? However, a substance at room temperature is cooler than the body, so when it is applied to the body, it extracts heat, making it not thermal neutral and not a good control variable. Is constant a algebraic expression? Constants are the terms in the algebraic expression that contain only […]