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roxenna attaches her 1.50 kg textbook to a 5.0 m, 4.00 n/m cord. she then drops it from a platform, 12.0 m off of the ground. show calculations step by step.

which of the following choices equals the elastic force in the cord at point 2?
a. 4.0 n
b. 6.0 n
c. 8.0 n
d. 12 n
20 n

The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is transformed ⇒ as it changes into other forms of energy.

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

Ababy stroller is a rest on top of a hill which is 10 m high. the stroller and baby have a mass of 20 kg. what is the potential energy of the baby and stroller?