They didn’t multiply 7 by 12, making it seven dozen
Answer:
(a) 62.5 N
(b) 694.4 N/m
(c) 41.7 N
Step-by-step explanation:
Work done in stretching a spring is
since 
F is the applied force, E is the elongation and k is the spring constant.
(a) Here, e = 16 cm = 0.16 m


(b) Here, e = 12 cm = 0.12 m


(c) The restoring force is the same as the applied force.

Answer:
Step-by-step explanation:
1) If
is needed to cover
than we need 3 more:
: 
Answer:
719010
Step-by-step explanation: