Announcements
... law using the same sort of torsion balance that Cavendish used to measure the gravitational constant G l But Cavendish had an easier time of it since mass does not tend to leak away as charge does l Did Coulomb’s data decisively determine a 1/r2 force law, or did he jump to that conclusion in or ...
... law using the same sort of torsion balance that Cavendish used to measure the gravitational constant G l But Cavendish had an easier time of it since mass does not tend to leak away as charge does l Did Coulomb’s data decisively determine a 1/r2 force law, or did he jump to that conclusion in or ...
Document
... 2. A hockey puck has a mass of 0.122 kg and is at rest. A hockey player makes a shot, exerting a constant force of 25.0 N on the puck for 0.180 s. With what speed does the puck head toward the goal? 3. How long must a 12.0 N force be applied to a 4.00 kg block sitting at rest on a frictionless surfa ...
... 2. A hockey puck has a mass of 0.122 kg and is at rest. A hockey player makes a shot, exerting a constant force of 25.0 N on the puck for 0.180 s. With what speed does the puck head toward the goal? 3. How long must a 12.0 N force be applied to a 4.00 kg block sitting at rest on a frictionless surfa ...
Electric Potential Difference
... The electric potential at a point is 0 J/C. Is it possible for the electric field at that point to be non-zero. If there is no charge, then there is no electric field. In order for an Electric Potential of 0 J/C, we need charges of ...
... The electric potential at a point is 0 J/C. Is it possible for the electric field at that point to be non-zero. If there is no charge, then there is no electric field. In order for an Electric Potential of 0 J/C, we need charges of ...
notes about solving friction problems
... (frictional force) = (coefficient of friction) x (contact force) The symbol μ that we are using is a Greek letter “mu,” and it is going to stand for the “coefficient of friction,” which is a unitless number that tells us how rough the two surfaces are. The coefficient of friction is different for di ...
... (frictional force) = (coefficient of friction) x (contact force) The symbol μ that we are using is a Greek letter “mu,” and it is going to stand for the “coefficient of friction,” which is a unitless number that tells us how rough the two surfaces are. The coefficient of friction is different for di ...
Physics 880.06: Problem Set 6
... Note: please turn these problems into the mailbox of the grader, Wissam AlSaidi, by 5PM on Friday, May 23, 2003. Remember that you will be graded only on the best 5 out of the 7 problem sets. 1. Consider a single Abrikosov vortex parallel to the z axis. Assume that this vortex experiences three forc ...
... Note: please turn these problems into the mailbox of the grader, Wissam AlSaidi, by 5PM on Friday, May 23, 2003. Remember that you will be graded only on the best 5 out of the 7 problem sets. 1. Consider a single Abrikosov vortex parallel to the z axis. Assume that this vortex experiences three forc ...
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.