Let us presume that this skydiver initially continues to fall downward as descri

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Let us presume that this skydiver initially continues to fall downward as described in the previous question, increasing | nu |. What is his net force once he reaches terminal velocity? (was in Chapter 4.) a) 1000 N b) 700 N c) 300 N d) 1300 N e) 0 N f) completely different value. A longitudinal force is exerted on an object Q. Which of the following is false? (a) the Kinetic Energy of the object changes as time passes. (b) the kinetic Energy of the object changes as the position of this object changes. (c) an additional perpendicular force newly introduced within the first second (so that curvature is less than 2 degree allows for the speed of Q to stay constant even thought two forces are present. (d) an instantaneously perpendicular force (an F2 which is to vel.) does not change the kinetic energy. Relative to the ground. an airplane gains speed when it encounters wind from behind, and loses speed when it encounters wind head on. When it encounters wind at a right angle to the direction it is pointing, its speed the ground below (A) increases. (B) decreases. (C) is the is same as if there were no wind. (D) Need more information A physics book and a portrait of Dali it falls, the portrait is dragged horizontally across the table book is pushed off the edge of a table surface. With no friction, acceleration of the 2 objects is (A) zero. (B) g (C) g/2 (D) a value between zero and g In an isolated system (no mass leaves or enters) in which there are many bodies interacting where the mechanical energy might decrease for all of the objects and bodies. But, the following hold s. A) The sum of thermal energy, mechanical energy, and other energy remains constant. B) The thermal energy constant. But the other energies approach zero over much time. C) The mechanical energy will completely revived over a long time because all systems with wheels and levers are cyclical. D) No prediction can be made since this is not necessarily a necessarily a harmonious & repetitive mechanical system. It is required that an object which has kinetic energy be A) moving. B) falling C) at an elevated position. D) at rest. E) none of these. An object that has significant potential energy may have this energy because of its A) speed. B) acceleration C) momentum D) position to other objects. E) none of these In figure 7-A, there is zero slippage that occurs on the marble as it roles along on the track. At position B, the extra potential energy has been__. A) increased from pt A, since all energy along with kinetic energy has increased B) reduced from pt A, where the potential energy has turned into kinetic energy C) remained the same as at pt A due to conservation of energy. D) reduced from pt A, where most of energy has disappeared, transforming into vibrational energy. E) been effected in another way. A truck with a weight of 5,000 N climbs up a step road which has a constant slope. This truck moves at constant a speed. This truck gains an altitude of very close to 8 meters within every 2 seconds. Presuming 100% efficiency, how much power is the engine of the truck delivering inorder to maintain this rate of climb? A) 2500 W D) 40,000 C) 20,000 W D) 40,000 W E) other

Explanation / Answer

part 17 )

potential energy U = mgh

U = is related to position in relation to other object

part 18 )

here energy is conserved

At B point , cpmpared to A PE is reduced and convert into kinetic energy ( B option )

part 19 )

P = W/t

W = F*d

t = 2 s

P = 5000*8/2 = 20,000 W

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