Category: Physics

Is force dimensionless quantity? The ratio of the internal forces to the external forces will depend upon its speed, and the viscosity of the fluid, and the size of the body. But the ratio of the internal to the viscous forces is dimensionless, so it must depend on some combination of the viscosity, speed V […]

Which of the following property of a charge can change when it moves freely in a uniform perpendicular magnetic field? The magnetic force acts perpendicular to the direction of motion of the proton. It does not change its mass and speed but changes its direction of motion. So both velocity and momentum get changed. What […]

What happens at the beginning of every roller coaster ride? What happens at the beginning of every roller coaster ride? The car is pulled up a long hill. [The roller coaster cannot go higher than the first hill because the total energy of the roller coaster cannot increase unless energy is added.] What happens to […]

What traits are dominant and recessive? The traits due to dominant alleles are always observed, even when a recessive allele is present. Traits due to recessive alleles are only observed when two recessive alleles are present. For example, the allele for widow’s peak is dominant and the allele for straight hairline is recessive. How do […]

What is rapidly renewable materials? The USGBC defines “rapidly renewable” as a material that’s able to regenerate itself in 10 years or less. That includes bio-based products made from plants harvested on a 10-year (or shorter) cycle. Rapidly renewable materials include linseed, straw, cotton, wheat, sunflowers, natural rubber, bamboo, and cork. Is Bamboo rapidly renewable? […]

What units are used for W? In both cases, the power (in watts, W) is calculated by dividing something in joules (J) by something in seconds (s). This means that an equivalent unit for the watt is the joule per second: 1 W = 1 J/s. What are the types of workers? Types of Workers […]

What happens to the resistivity of wire if it is stretched? The resistance of a wire is inversely proportional to its area and directly proportional to its length. When the length is tripled then resistance will also become three times. If The wire is stretched 3 times the original length, the cross-section of the wire […]

What happens in terms of energy when a player strikes the sweet spot? Hitting the ball on the sweet spot makes the vibration caused by the ball hitting the bat cancel out. Since less energy is used on that vibration, more energy can go to the ball. This causes the ball to bounce off of […]

What is the lowest passing grade? D Are BS a good grade? If you really are focused on bringing your grade up, consider asking for any extra credit you may be able to complete A B- is still a good grade, so don’t stress yourself. A grade of B will not keep you out of […]

What are the 5 Rules of contour lines? Rule 1 – every point of a contour line has the same elevation. Rule 2 – contour lines separate uphill from downhill. Rule 3 – contour lines do not touch or cross each other except at a cliff. Rule 4 – every 5th contour line is darker […]