A tow truck is pulling a car out of a ditch by means of a steel cable (y = 2.0 x 1011 n/m2) that is 9.55 m long and has a radius
1 answer:
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Answer:
the number of grains in the ball is 274,848
Explanation:
Given that;
diameter = 0.5 mm
so radius r = 0.25 mm
first we determine the volume of the ball using the following equation;
V = 4/3×πr³
we substitute
V = 4/3×π(0.25)³
V = 0.06544 mm³
Now form table 1.1 "Grain sizes" a metal with grain size number of 12 has about 4,200,000 grains/mm³
so;
Number of grains N = 0.06544 × 4,200,000
N = 274,848 grains
Therefore, the number of grains in the ball is 274,848
Answer:
Explanation:
Drag force is given by
C = Drag coefficient is constant
A = Area is constant
= Velocity of the passenger jet = 1200 km/h =
= Velocity of the prop plane =
= Density of the air where the jet was flying =
= Density of the air where the prop plane was flying =
The ratio of the drag forces is .