Q1
http://s30.postimg.org/7gwwvi1rj/Pipes.jpg
Water (viscosity = 8.90 × 10-4 Pa s, density = 1.00 ×103 kg/m3) flows along the pipe shown in the diagram, the diagram is not to scale. The first pipe (at the top) has a radius, R1 = 0.5470 m and the second pipe (at the bottom) has a radius, r2 = 0.2810 m. Water in the first pipe has a pressure of P1 = 1.133 atm and flows at a speed of v1 = 0.3680 ms-1. The height difference, h, between the two pipes is 10 m.
What is the speed of water along the second pipe?__ ms-1
What is the pressure of water in the second pipe?___atm
What is the rate at which the water looses gravitational potential energy?__ W
Q2
http://postimg.org/image/7a1exlnwf/
Two balls collide. The diagram below shows the initial and final velocities of the balls.
In this case:
m1 = 1.88 kg
m2 = 2.15 kg
u1 = 4.91 ms-1
u2 = -2.59 ms-1
v1 = -1.56 ms-1
v2 = ?
What is the initial momentum of the system?__ kgms-1 (Note: if it is to the left enter a negative answer)
What is the final velocity of ball 2?__ ms-1 to the right (enter a negative number if it is to the left)
If the collision lasts for 0.124 s what is the magnitude of the impulse felt by ball 1?__ Ns (right is positive, left is negative)
What average force is experienced by ball 1 during the collision?__ N (right is positive, left is negative)
Select any of the comments below that are correct (there may be more than one correct answer).
Select one or more:
a. Kinetic energy is conserved in this collision so the collision is elastic.
b. The forces experienced by ball 1 and ball 2 have the same magnitude.
c. Momentum is conserved so this is an elastic collision.
d. Ball 1 and ball 2 experience identical forces.
e. Kinetic energy is not conserved in this collision so this is an inelastic collision.
謝謝！！
更新1:
謝謝你的幫忙~~不過我交左first draft 話呢兩條答案不對~~想問問會不會有別的做法？ What is the pressure of water in the second pipe?___atm What is the rate at which the water looses gravitational potential energy?__ W