PHYSICS 221 ... Final Exam Solutions May 3 2005 2:15pm—4:15pm
... −σ are separated by a distance d. Let E1 be the magnitude of the electric field half way between the two plates. In Figure 2 the two identical plates are separated by a distance 2d and the electric field half way between the plates is E2. What is the ratio between E1 and E2? (A)E1:E2=4:1 ...
... −σ are separated by a distance d. Let E1 be the magnitude of the electric field half way between the two plates. In Figure 2 the two identical plates are separated by a distance 2d and the electric field half way between the plates is E2. What is the ratio between E1 and E2? (A)E1:E2=4:1 ...
electrical field
... and the ground or between two clouds. As the electrons flow through the ionized air, they generate so much heat that a PLASMA is produced. We see that plasma and call it LIGHTNING! The air around the lightning expands so rapidly from the heat that it creates a strong pressure wave of air molecules ( ...
... and the ground or between two clouds. As the electrons flow through the ionized air, they generate so much heat that a PLASMA is produced. We see that plasma and call it LIGHTNING! The air around the lightning expands so rapidly from the heat that it creates a strong pressure wave of air molecules ( ...
Document
... Earth, it is often convenient to have the x-axis point east and the yaxis point north. When the motion involves an object moving through the air, the positive x-axis is often chosen to be horizontal and the positive yaxis vertical (upward). If the motion is on a hill, it’s convenient to place the po ...
... Earth, it is often convenient to have the x-axis point east and the yaxis point north. When the motion involves an object moving through the air, the positive x-axis is often chosen to be horizontal and the positive yaxis vertical (upward). If the motion is on a hill, it’s convenient to place the po ...
Momentum
... A) 9 a B) a /3 C) a /4 D) a /9 E) 27 a Answer: D 14. Suppose a planet exists that has half the mass of earth and half its radius. On the surface of that planet, the acceleration due to gravity is A) twice that on earth. D) one-fourth that on earth. B) the same as that on earth. E) none of these. C) ...
... A) 9 a B) a /3 C) a /4 D) a /9 E) 27 a Answer: D 14. Suppose a planet exists that has half the mass of earth and half its radius. On the surface of that planet, the acceleration due to gravity is A) twice that on earth. D) one-fourth that on earth. B) the same as that on earth. E) none of these. C) ...
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.