A weightless spring of force constant 2.50 N/cm is 15.0 cm long when nothing is attached to it. It is now used to pull horizontally on a 12.5 kg box on a smooth horizontal floor
You observe that the box starts from rest and moves 96.0 cm during the first 1.60 s of its motion. How long is the spring during this motion?
18.8 cm
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Two parallel square metal plates that are 1.5 cm apart and 22 cm on each side carry equal but opposite charges uniformly spread out over their facing surfaces
How many excess electrons are on the negative surface if the electric field between the plates has a magnitude of 18,000 N/C? (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 C)
When a flower petal is 4.0 cm in front of a converging lens, the inverted image is half the height of the petal. What is the focal length of this lens?
A) 1.3 cm B) 2.0 cm C) 4.0 cm D) 5.3 cm
What is the underlying cause of air motion?
What will be an ideal response?
Oceanic thermal generation operates from a relatively inexhaustible source of energy in the oceans that have heat energy from
A. subatomic heat. B. the decay of carbon in the rock formations underlying Earth's oceans. C. the energy in sunlight. D. carbon dioxide in the ozone layer.