2009F Exam 2
... catapult during the launch is 6.5 multiplied by 108 J. (a) What is the mass of the jet? (b) If the jet is in contact with the catapult for 2.4 s, what is the power output of the catapult? [ANS] N/A ...
... catapult during the launch is 6.5 multiplied by 108 J. (a) What is the mass of the jet? (b) If the jet is in contact with the catapult for 2.4 s, what is the power output of the catapult? [ANS] N/A ...
Midterm I Solutions ρ
... 7. A ball is thrown horizontally from the top of a 15 m high cliff. If the initial speed of the ball is 10 m/s, what is the speed of the ball when it hits the ground? 10 m/s A) 10 m/s B) 15 m/s 15 m C) 19.8 m/s D) 29.8 m/s E) none of the above The easiest way to get the answer is by conservation of ...
... 7. A ball is thrown horizontally from the top of a 15 m high cliff. If the initial speed of the ball is 10 m/s, what is the speed of the ball when it hits the ground? 10 m/s A) 10 m/s B) 15 m/s 15 m C) 19.8 m/s D) 29.8 m/s E) none of the above The easiest way to get the answer is by conservation of ...
PDF of Slides
... Having balanced forces is the same as saying that the net force is zero. Remember: Balanced forces does not mean that there’s no motion! Floor ...
... Having balanced forces is the same as saying that the net force is zero. Remember: Balanced forces does not mean that there’s no motion! Floor ...
FA#5--Rotational Dynamics I FA#5
... (8) A 9.75-m ladder with a mass of 23.2 kg lies flat on the ground. A painter grabs the top end of the ladder and pulls straight upward with a force of 245 N. At the instant the top of the ladder leaves the ground, the ladder experiences an angular acceleration of 1.80 rad/s2 about an axis passing t ...
... (8) A 9.75-m ladder with a mass of 23.2 kg lies flat on the ground. A painter grabs the top end of the ladder and pulls straight upward with a force of 245 N. At the instant the top of the ladder leaves the ground, the ladder experiences an angular acceleration of 1.80 rad/s2 about an axis passing t ...
Electrostatics HW 2 HW 4.2 1e- = -1.6x10
... What can you conclude about the magnitude of the wool’s charge after the rubbing? Why? ...
... What can you conclude about the magnitude of the wool’s charge after the rubbing? Why? ...
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.