1A week 3 tutorial questions fall 1998
... d) What is the minimum force required to keep the box in motion once it has started? e) If the horizontal force is 12N, how great is the frictional force? 5. NASA has a great big centrifuge that they use to test how large a 'g' force human beings can tolerate before they black out. (This is importan ...
... d) What is the minimum force required to keep the box in motion once it has started? e) If the horizontal force is 12N, how great is the frictional force? 5. NASA has a great big centrifuge that they use to test how large a 'g' force human beings can tolerate before they black out. (This is importan ...
Electric Force
... 1. A hydrogen atom is composed of a nucleus containing a single proton, about which a single electron orbits. The electric force between the two particles is 2.3×1039 greater than the gravitational force! If we can adjust the distance between the two particles, can we find a separation at which the ...
... 1. A hydrogen atom is composed of a nucleus containing a single proton, about which a single electron orbits. The electric force between the two particles is 2.3×1039 greater than the gravitational force! If we can adjust the distance between the two particles, can we find a separation at which the ...
2003 aapt physics olympiad
... A cube of aluminum has side length 0.10 m. It is dropped into a deep swimming pool of water with density 1.00 x 103 kg/m3. The cube comes gently to rest at the bottom of the pool. If the density of the aluminum is 2.7 x 103 kg/m3, the magnitude of the buoyant force acting on the aluminum is: A) 26.6 ...
... A cube of aluminum has side length 0.10 m. It is dropped into a deep swimming pool of water with density 1.00 x 103 kg/m3. The cube comes gently to rest at the bottom of the pool. If the density of the aluminum is 2.7 x 103 kg/m3, the magnitude of the buoyant force acting on the aluminum is: A) 26.6 ...
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.