Find the current through a person and identify the likely effect on her if she touches a 120 V AC source in the following circumstances. (Note that currents above 10 mA lead to involuntarily muscle contraction.) (a) Find the current (in mA) if she is standing on a rubber mat and offers a total resistance of 330 kΩ. mA Identify the likely effect. 1. She will experience muscle contraction for the duration of the shock. 2. She will feel nothing. (b) Find the current (in mA) if she is standing barefoot on wet grass and has a resistance of only 3600 kΩ. mA Identify the likely effect. 1. She will experience muscle contraction for the duration of the shock. 2. She will feel nothing.

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

a skateboard rolling across the street - apex

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.