Chris and Jamie are carrying Wayne on a horizontal stretcher. The uniform stretcher is 2.00 m long and weighs 100 N. Wayne weighs 800 N. Wayne's center of gravity is 75.0 cm from Chris. Chris and Jamie are at the ends of the stretcher. The upward force that Jamie is exerting to support the stretcher, with Wayne on it, is:

Complete Question

The diagram for this question is shown on the first uploaded image

The value is

Explanation:

From the question we are told that

   The length of the stretcher is  

    The weight of the stretcher is

    The weight for Wayne is  

     The distance of  center of gravity for Wayne from Chris is

Generally taking moment about the first end where Chris is

                       => upward moment

Here is the force applied by Jamie

Generally  taking moment about the second end where Jamie is

           => downward moment

Generally at equilibrium , the upward moment is equal to the downward moment

=>  

=>    

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation: