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... 54. Two skaters are initially at rest next to each other on frictionless ice. Skater A pushes on skater B. If skater A has greater mass than skater B, which of the following correctly relates the magnitudes of their momentums p and their kinetic energies K after the push? (A) pA = pB and KA < KB (B) ...
... 54. Two skaters are initially at rest next to each other on frictionless ice. Skater A pushes on skater B. If skater A has greater mass than skater B, which of the following correctly relates the magnitudes of their momentums p and their kinetic energies K after the push? (A) pA = pB and KA < KB (B) ...
Electric Field Strength
... Grounding an object provides a conduit in which the excess electrons can leave the object. Objects that are charged by induction can gain a permanent charge by grounding. Objects that are charged by induction and then grounded end up with an opposite charge than the conductor. Objects charged by con ...
... Grounding an object provides a conduit in which the excess electrons can leave the object. Objects that are charged by induction can gain a permanent charge by grounding. Objects that are charged by induction and then grounded end up with an opposite charge than the conductor. Objects charged by con ...
Electric Force and Fields
... Electric field from a point charge : E = k Q / r2 The electric field from a positive charge points away from the charge; the electric field from a negative charge points toward the charge. Like the electric force, the electric field E is a vector. If the electric field at a particular point is known ...
... Electric field from a point charge : E = k Q / r2 The electric field from a positive charge points away from the charge; the electric field from a negative charge points toward the charge. Like the electric force, the electric field E is a vector. If the electric field at a particular point is known ...
Momentum is a property of an object in motion. An object in
... torque) exerted on the object multiplied by the time interval over which the force (or torque) acts. The impulse (or angular impulse) given an object equals the object’s change in linear momentum (or angular momentum). FΔt = Δp; τΔt = ΔL By Newton’s third law of motion, when two objects interact, th ...
... torque) exerted on the object multiplied by the time interval over which the force (or torque) acts. The impulse (or angular impulse) given an object equals the object’s change in linear momentum (or angular momentum). FΔt = Δp; τΔt = ΔL By Newton’s third law of motion, when two objects interact, th ...
URL - StealthSkater
... small craft as the "Sport Model" Flying Disc from Zeta-2 Reticuli Planet 4 to our Earth. Perhaps the “Sport Model” is a shuttle craft for a much larger “mother ship” stationed somewhere within our Solar System. But even if the “Sport Model” is “merely” a “shuttle craft” associated with a much larger ...
... small craft as the "Sport Model" Flying Disc from Zeta-2 Reticuli Planet 4 to our Earth. Perhaps the “Sport Model” is a shuttle craft for a much larger “mother ship” stationed somewhere within our Solar System. But even if the “Sport Model” is “merely” a “shuttle craft” associated with a much larger ...
Physics and Philosophy beyond the Standard Model
... ever be created or destroyed. The universe would not be unified to near-uniform temperature and curvature by the whole cosmos having once been small enough for everything to be in contact, then undergoing extremely rapid expansion from a big bang during a period called inflation. It would be quantum ...
... ever be created or destroyed. The universe would not be unified to near-uniform temperature and curvature by the whole cosmos having once been small enough for everything to be in contact, then undergoing extremely rapid expansion from a big bang during a period called inflation. It would be quantum ...
BASIC CONCEPTS OF BIOMECHANICS
... Wind in opposing direction decelerates ball. Resistance, so decelerates ball (gives more time before contact) Time in air = greater gravitational deceleration Racket contact with ball – ball warped (and racket) ...
... Wind in opposing direction decelerates ball. Resistance, so decelerates ball (gives more time before contact) Time in air = greater gravitational deceleration Racket contact with ball – ball warped (and racket) ...
Weightlessness
Weightlessness, or an absence of 'weight', is an absence of stress and strain resulting from externally applied mechanical contact-forces, typically normal forces from floors, seats, beds, scales, and the like. Counterintuitively, a uniform gravitational field does not by itself cause stress or strain, and a body in free fall in such an environment experiences no g-force acceleration and feels weightless. This is also termed ""zero-g"" where the term is more correctly understood as meaning ""zero g-force.""When bodies are acted upon by non-gravitational forces, as in a centrifuge, a rotating space station, or within a space ship with rockets firing, a sensation of weight is produced, as the contact forces from the moving structure act to overcome the body's inertia. In such cases, a sensation of weight, in the sense of a state of stress can occur, even if the gravitational field was zero. In such cases, g-forces are felt, and bodies are not weightless.When the gravitational field is non-uniform, a body in free fall suffers tidal effects and is not stress-free. Near a black hole, such tidal effects can be very strong. In the case of the Earth, the effects are minor, especially on objects of relatively small dimension (such as the human body or a spacecraft) and the overall sensation of weightlessness in these cases is preserved. This condition is known as microgravity and it prevails in orbiting spacecraft.