|| BIO Force during a jump. An average person can reach a maximum height of about 60 em when jumping straight up from a crouched position. During the jump itself, the person's body from the knees up typically rises a distance of around 50 em. To keep the calculations simple and yet get a reasonable result, assume that the entire body rises this much during the jump. (a) With what initial speed does the person leave the ground to reach a height of 60 em? (b) Make a free-body diagram of the person during the jump. (c) In terms of this jumper's weight W, what force does the ground exert on him or her during the jump?
|| BIO Force during a jump. An average person can reach a maximum height of about 60 em when jumping straight up from a crouched position. During the jump itself, the person's body from the knees up typically rises a distance of around 50 em. To keep the calculations simple and yet get a reasonable result, assume that the entire body rises this much during the jump. (a) With what initial speed does the person leave the ground to reach a height of 60 em? (b) Make a free-body diagram of the person during the jump. (c) In terms of this jumper's weight W, what force does the ground exert on him or her during the jump?
|| BIO Force during a jump. An average person can reach a maximum height of about 60 em when jumping straight up from a crouched position. During the jump itself, the person's body from the knees up typically rises a distance of around 50 em. To keep the calculations simple and yet get a reasonable result, assume that the entire body rises this much during the jump. (a) With what initial speed does the person leave the ground to reach a height of 60 em? (b) Make a free-body diagram of the person during the jump. (c) In terms of this jumper's weight W, what force does the ground exert on him or her during the jump?
Q2: Jane, who weighs 500 N, must cross a river full of hungry crocodiles to save Tarzan, who weighs 700 N, from danger. She jumps (from rest) off a cliff hanging from the end of an 18 m long vine, Fig.length, Fig. 1(b). From the top of the cliff to the lowest point of the trajectory she descends 3.0 m. The vine will breakif the force exerted on it exceeds 650 N.(a) Show that she will not be able to reach Tarzan?(b) And determine the angle of rupture θ, with respect to vertical.(c) Using a rope strong enough to hold them both, Jane rescues Tarzan. What will be the speed of thetwo when Jane "grabs" him (assume Jane is strong enough to hold him)?(d) Is the energy conserved? If yes, justify, if no, calculate∆K/Ki and explain what happened to the energy.
Chapter 07, Problem 051
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A force F = (7.I0N)? + (4.00 N)ĵ + (5.00 N) k acts on a 1.70 kg mobile object that
moves from an initial position of di
: (3.70 m) î + (8.10 m)ĵ + (2.00 m) ê to a final
=
position of áf = (2.80 m)î + (8.50 m)} + (4.40 m) k in 1.70 s. Find (a) the work
done on the object by the force in the 1.70 s interval, (b) the average power due to the
force during that interval, and (c) the angle between vectors d; and df.
a dj.
(a) Number
Units
38.8
(b) NumberT22.8
Units
(c) NumberT12.43
UnitsTo (degrees)
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