The reaction force exerted by the floor of the elevator on the man is D.944 N
Step-by-step explanation:
When the elevator is accelerating upwards at 2 m/s² there occurs a fictitious force acting downwards to produce a downward acceleration of 2 m/s².
The formula to apply here is ;
Weight due to gravity=mg where m is mass of the man and g is acceleration due to gravity.
Due to additional downward acceleration the total acceleration downwards will be : 9.8+2 = 11.8 m/s²
The man weighs down on the elevator floor with a force of ;
F=m(a+g) where m is mass of man, a is acceleration
F=80( 9.8+2)
F=80(11.8)= 944 N
The reaction force by the floor of the elevator is thus 944 N
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Elevator physics :brainly.com/question/13464055
Keywords : elevator, acceleration, moving upwards, reaction force, floor
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Answer:
. In other words, there number of girls is
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Step-by-step explanation:
The average of a number of measurements is equal to the sum of these measurements over the number of measurements.
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Rewrite to obtain:
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For this question:
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Therefore:
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On the other hand, there are
boys and girls in total. Using the formula for average:
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From the question, this average should be equal to
. In other words:
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Solve this equation for
to obtain:
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In other words, the number of girls here is
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Answer:
Whats The Answer Choice?
Step-by-step explanation:
Answer:
-4
Step-by-step explanation:
the highest f(x) value on the table is at -4 on the x column
Answer:
65°
Step-by-step explanation:
To obtain Angle A, we use the cosine rule ;
Cos A = (b² + c² - a²) / 2bc
Cos A = (12² + 14² - 14²) / 2(12)(14)
Cos A = 144 / 336
A = Cos^-1(144/336)
A = 64.62°
A = 65°