Question

7) A ballet dancer does a pirouette on the tip of his toe. If the dancer has a weight of 580 N and the tip of his ballet shoe measures 0.02 m by 0.01 m, what
pressure does his toe exert on the stage?
8) A poorly tied down blimp falls over in a field. If the blimp exerts a downward force of 4000 N over an area of 250 m, what pressure is put on the ground by
the blimp?
9) The tip of a hypodermic needle is pressed against someone's skin with a force of 2 N. If the tip of the needle has an area of 0.000 001 m, what is the
pressure exerted on the skin by the needle?
10) A charity fundraiser fits 12 students into a small car. If the combined weight of the car and students is 1600 kg and the combined area of the wheels
touching the ground is 0.08 m, what is the pressure placed on the ground by the car and students?






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Answer 1

Explanation:

solution:

7. P= Force/Area

P= 580/0.0002

P= 2,900,000

The pressure exerted by the ballet dancer is 2,900,000 newtons per metre squared.

8.Pressure=force/area

=4000n/250m

=16 pasacl

9. P= f/a

P= 2/0.000001

P= 2,000,000

The pressure exerted by the needle is 2,000,000 newton per metre squared.

10. According to the question:

We know that pressure=force/area

=ma/area

=1600×9.8/0.08

=196000N/m^2