A .22 rifle bullet, traveling at 305 m/s,strikes a block of soft wood, which it
ID: 1739581 • Letter: A
Question
A .22 rifle bullet, traveling at 305 m/s,strikes a block of soft wood, which it penetrates to a depth of0.130 m. The block of wood is clamped inplace and doesn't move. The mass of the bullet is 1.30 g. Assume a constant retarding force.(a) How much time is required for the bullet to stop?
1 s
(b) What force, in newtons, does the wood exert on the bullet?
2 N
A Standing Vertical Jump.A basketball playeris on record as attaining a standing vertical jump of 1.2 m (4 ft).(This means that he moved upward by 1.2 m after his feet left thefloor.) The basketball player weighs 850 N(191 lb).
(a) What is his speed as he leaves the floor?The two blocks in Fig. 4.32 are connected by a heavy uniformrope with a mass m = 4.00 kg. Anupward force F = 172 N is appliedas shown (a) Draw three free-body diagrams, one for the 6.00 kg block,one for the 4.00 kg rope, and another onefor the 5.00 kg block. For each force, indicate what body exertsthat force. (Do this on paper. Your instructor may ask you to turnin this work.)
1 m/s
(b) If the time of the part of the jump before his feet leave thefloor was 0.320 s, what is his averageacceleration while he was pushing against the floor?
2 m/s2
(c) Draw his free-body diagram. (See Section 4.6. Do this on paper.Your instructor may ask you to turn in this work.)
In terms of the forces on the diagram, what is the net force onhim? Use Newton's laws and the results of part(b) to calcualate theaverage force he applied to the ground.
4 N
(b) What is the acceleration of the system?
2____________ m/s2 (upwards)
(c) What is the tension at the top of the heavy rope?
3 N
(d) What is the tension at the midpoint of the rope?
4 N (a) How much time is required for the bullet to stop?
1 s
(b) What force, in newtons, does the wood exert on the bullet?
2 N
A Standing Vertical Jump.A basketball playeris on record as attaining a standing vertical jump of 1.2 m (4 ft).(This means that he moved upward by 1.2 m after his feet left thefloor.) The basketball player weighs 850 N(191 lb).
(a) What is his speed as he leaves the floor?The two blocks in Fig. 4.32 are connected by a heavy uniformrope with a mass m = 4.00 kg. Anupward force F = 172 N is appliedas shown (a) Draw three free-body diagrams, one for the 6.00 kg block,one for the 4.00 kg rope, and another onefor the 5.00 kg block. For each force, indicate what body exertsthat force. (Do this on paper. Your instructor may ask you to turnin this work.)
1 m/s
(b) If the time of the part of the jump before his feet leave thefloor was 0.320 s, what is his averageacceleration while he was pushing against the floor?
2 m/s2
(c) Draw his free-body diagram. (See Section 4.6. Do this on paper.Your instructor may ask you to turn in this work.)
In terms of the forces on the diagram, what is the net force onhim? Use Newton's laws and the results of part(b) to calcualate theaverage force he applied to the ground.
4 N
(b) What is the acceleration of the system?
2____________ m/s2 (upwards)
(c) What is the tension at the top of the heavy rope?
3 N
(d) What is the tension at the midpoint of the rope?
4 N
Explanation / Answer
kinetic energy of the bullet K= mv^2 / 2 m = mass ofthe bullet v = velocity of thebullet penetration depth into the wood = S average force on the bullet F = E /S acceleration of the bullet = a = F / m time of penetration be =t S = vt-at^2 / 2 v = initla velocity of the bullet a = acceleration of the bullet t = time . using the given values from the aboverelations we can sovle for the F, t SEND ONLY ONE QUESTION PER POST.Related Questions
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