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6. Which of the following is not a wedge?
a.
chisel b. jackscrew
c. nail
d. knife
7. Which of the following is a lever?
a.
screw b. Ferris wheel
c. ax
d. tooth
8. The work done by a machine is 80 joules while the work done on
the machine is 92 joules. What is the efficiency of the machine?
a.
72%
c. 90% d. 111%
b. 87%​


Sagot :

Answer:

sorry

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