How Do Nurses Calculate the Weight of a Patient Using Newtons?

  • Thread starter Thread starter themadperseid
  • Start date Start date
  • Tags Tags
    Method
AI Thread Summary
To calculate a patient's weight using Newtons, the total upward force exerted by the nurses is 960 N, derived from four nurses each applying 240 N. The patient experiences an upward acceleration of 0.504 m/s², which must be added to the gravitational force for accurate weight calculation. The formula used is 960 N = m(g + 0.504), leading to a patient mass of approximately 93.2 kg. Consequently, the weight is calculated as W = mg, resulting in 913 N. The calculations confirm that the weight of the patient is indeed 913 N.
themadperseid
Messages
6
Reaction score
0
Here is the question

To lift a patient, four nurses grip the sheet on which the patient is lying and lift upward. If each nurse exerts an upward force of 240n, and the patient has an upward acceleration of .504 m/s^2, what is the patients weight.

answer: 913 N

HOW DOES THIS WORK. THANKS
 
Physics news on Phys.org
weird, I keep getting 638N

Are you sure this answer you provided is correct?
 
I get 913 N as the weight as well.

960 N=W+m*.540 m/s^2
960 N= m(g+.54)
m=93.08 kg
W=mg=913 N
 
riru, just in case u missed that,
knowns
960n force up
.504 m/s^2 acceleration

n=kg*m/s^2
960n=?kg*(.504+9.8)---->to accelerate upwards, the force is the upward velocity, plus gravity, since that is being overcome.

thus, you have 93.2kg patient (mass)
w=mg
so 93.2kg*9.8m/s^2=913n
 
Thread 'Variable mass system : water sprayed into a moving container'
Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
I was thinking using 2 purple mattress samples, and taping them together, I do want other ideas though, the main guidelines are; Must have a volume LESS than 1600 cubic centimeters, and CAN'T exceed 25 cm in ANY direction. Must be LESS than 1 kg. NO parachutes. NO glue or Tape can touch the egg. MUST be able to take egg out in less than 1 minute. Grade A large eggs will be used.
Back
Top