3. A carpenter uses a crowbar to remove the top of a box. The top has a resistance of 500 N. The
carpenter applies an input force of 250 N. What is the mechanical advantage of the crowbar?
aw-Hill Companies, In

2

Explanation:

M.A= load/effort

Load= resistance force =500N

Effort= input force = 250N

Hence,

M.A = 500/250

M.A=2

this would be about 43%

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.