1.) Due to a jaw injury, a patient must wear a strap (see the figure) that produ

Question

1.) Due to a jaw injury, a patient must wear a strap (see the figure) that produces a net upward force of 7.90 N on his chin. The tension is the same throughout the strap. To what tension must the strap be adjusted to provide the necessary upward force?

2.) The upward normal force exerted by the floor is 690 N on an elevator passenger who weighs 740 N .

What is the reaction force to the upward normal force exerted by the floor?

What is the reaction force to weight of the passenger?

What is the magnitude of the acceleration?

Explanation / Answer

1) NEED A FIGURE TO SLOVE THE PROBLEM

2) According to newton's third law action = -reaction

if upward normal force is the action then the reaction is -690N

if weight of the passenger is the action then reaction force is the -740 N

net force is Fnet = 690-740 = -50 N

then according to Newton's second law

Fnet = m*a

m is mass of the passenger = 740/9.8 = 75.5 kg

accelaration a = Fnet/m = -50/75.5 = -0.662 m/s^2

magnitude of accelaration a   = 0.662 m/s^2

and direction is in downwared direction

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