Spring p has force constant k and a little boy stretches it a distance ℓ. spring q has force constant 2 k and the same little boy stretches it a distance 2 ℓ. what is the ratio wq wp of the work done by the boy?

Along, straight wire with 3.0 a current flowing through it produces magnetic field strength 1.0 t at its surface. if the wire has a radius r, where within the wire is the field strength equal to 36.0% of the field strength at the surface of the wire? assume that the current density is uniform throughout the wire

Ameter stick is pivoted at the 0.50-m line. a 3.0-kg object is hung from the 0.15-m line. where should a 5.0-kg object be hung to achieve equilibrium (the meter stick oriented horizontal and motionless)?

Atomic nuclei of almost all elements consist of