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physics student

Questions (6)

Which of the following statements about emission spectra is correct?All the lines are evenly spaced. All noble gases have the
1. 2 answers
2. 2,232 views
A conductor of length 2m carrying a 1.5A current experiences a force of 2.2 N. What is the magnitude of the magnetic field that
1. 0 answers
2. 1,143 views
Which of the following is true for a photon?A photon of wavelength 3000 x 10-10 m has momentum twice than a photon of wavelength
1. 0 answers
2. 840 views
a 715 N person walks up three flights of stairs, covering a total vertical distance of 10.5 m. (a) If, as is typical, only 20%
1. 3 answers
2. 610 views
a standard man intending to do reverse curls in a gym. He holds his arms straight, using an overhand grip to hold the bar. If
1. 1 answer
2. 571 views
The forces acting on the arm of a person lifting a dumbbell. The force F is the force pulling on the hand due to the weight of
1. 1 answer
2. 2,442 views

Thanks, I am unsure of how to start the problem though.
my values were θ = 40o, m1 = 397g, m2 = 314g, |Fext| = 4.7 N... i got my answer as 0.971 N

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