2nd lecture The electric field_Coulombs law
... and er is the unit vector parallel with r, er=r/r. Thus two +1 C charges would repel each other with a force of 9x109 N. Moreover the vector equation shows the direction of the force which is a repelling one in the case of charges with the same sing and an attracting one for charges with different s ...
... and er is the unit vector parallel with r, er=r/r. Thus two +1 C charges would repel each other with a force of 9x109 N. Moreover the vector equation shows the direction of the force which is a repelling one in the case of charges with the same sing and an attracting one for charges with different s ...
CHAPTER 6
... which gives v = 8.03 m/s. (b) For the motion from the release point to the highest point, we use energy conservation: KEi + PEgravi + PEspringi = KEf + PEgravf + PEspringf ; 0 + 0 + 1/2 kx2 = 0 + mgh + 0; 0 + 0 + 1/2 (900 N/m)(0.150 m)2 = (0.300 kg)(9.80 m/s2)h, which gives h = 3.44 m. ...
... which gives v = 8.03 m/s. (b) For the motion from the release point to the highest point, we use energy conservation: KEi + PEgravi + PEspringi = KEf + PEgravf + PEspringf ; 0 + 0 + 1/2 kx2 = 0 + mgh + 0; 0 + 0 + 1/2 (900 N/m)(0.150 m)2 = (0.300 kg)(9.80 m/s2)h, which gives h = 3.44 m. ...
PES 1120 Spring 2014, Spendier Lecture 2/Page 1 Lecture
... 1) Showed the electric discharge from Van de Graff generator to a nearby grounded rod 2) Showed the hair stands up like charges repel! 3) Laid a stack of aluminum pie plates on the generator and turn it on. The plates will rose off one at a time by electrostatic repulsion as if they were an armada ...
... 1) Showed the electric discharge from Van de Graff generator to a nearby grounded rod 2) Showed the hair stands up like charges repel! 3) Laid a stack of aluminum pie plates on the generator and turn it on. The plates will rose off one at a time by electrostatic repulsion as if they were an armada ...
1 - Net Start Class
... e. TRUE - A projectile could be moving strictly in a vertical direction with no horizontal motion. A ball thrown straight up in the air would be such a case. f. TRUE - There is no rule about which direction a projectile must be moving at the instant it is projected. It could begin its motion with a ...
... e. TRUE - A projectile could be moving strictly in a vertical direction with no horizontal motion. A ball thrown straight up in the air would be such a case. f. TRUE - There is no rule about which direction a projectile must be moving at the instant it is projected. It could begin its motion with a ...
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.