Category: Physics

What are the four categories of immune system disorders? Examples of autoimmune diseases include: Rheumatoid arthritis. Systemic lupus erythematosus (lupus). Inflammatory bowel disease (IBD). Multiple sclerosis (MS). Type 1 diabetes mellitus. Guillain-Barre syndrome. Chronic inflammatory demyelinating polyneuropathy. Psoriasis. What is the difference between a patient receiving a vaccine and immune serum? Vaccine therapy for prevention […]

What is the exact diameter of Earth? 12,756 km Which one is bigger Mercury or Earth? Mercury’s diameter is 3,030 miles (4,878 km), comparable to the size of the continental United States. This makes it about two-fifths the size of Earth. It is smaller than Jupiter’s moon Ganymede and Saturn’s moon Titan. But it’s not […]

What is the weight of Aluminium? Aluminum has an atomic weight of 26.9815 in Daltons or grams per mole (g/mol). This means if you have a certain number of moles of aluminum, you can multiply it by the atomic weight to figure out how many grams per mole of aluminum you have. This accounts for […]

What is efficiency give an example? Efficiency is defined as the ability to produce something with a minimum amount of effort. An example of efficiency is a reduction in the number of workers needed to make a car. The ratio of the effective or useful output to the total input in any system. What is […]

How does electric motor works and what is its importance? Most electric motors operate through the interaction between the motor’s magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor’s shaft. General-purpose motors with standard dimensions and characteristics provide convenient mechanical power for industrial […]

How long would it take to get to Mars with a solar sail? The idea is to yoke a small probe to a solar sail, orbit a laser array, and push the probe toward its destination at speeds far in excess of anything we can attain these days. Lubin estimates a probe weighing only a […]

What has the strongest gravitational field? Jupiter, the fifth planet from the Sun, has the strongest gravitational pull because it’s the biggest and most massive. Massive Gravitation. Jupiter and the Asteroid Belt. Almost a Star. Jupiter and Neighboring Planets. Who found the value of G? Henry Cavendish How would the value of G and G […]

What is the ratio of the volume of a sphere? For a sphere, surface area is S= 4*Pi*R*R, where R is the radius of the sphere and Pi is 3.1415… The volume of a sphere is V= 4*Pi*R*R*R/3. So for a sphere, the ratio of surface area to volume is given by: S/V = 3/R. […]

What is the equation of the line through with an undefined slope? If the slope of a line is undefined, then the line is a vertical line, so it cannot be written in slope-intercept form, but it can be written in the form: x=a , where a is a constant. If the line has an […]

Does friction decrease inertia? Overcoming Inertia Once an object starts moving, inertia keeps it moving without any additional force being applied. Friction opposes the motion of all moving objects, so—like the skateboard—all moving objects eventually stop moving even if no other forces oppose their motion. What is the importance of friction in our daily life? […]