Two people, each of 70 kg mass, are riding in an elevator. One is standing on the floor. The other is hanging on a rope suspended from the ceiling. Compare the force
the floor exerts on the first person to the force 
the rope exerts on the second person. Which statement is correct?
a.
They are equal and opposite in direction.
b.
They are equal and have the same direction.
c. is greater than but they have the same direction.
d. is greater than they have opposite directions.
e. is less than , but they have the same direction.
b
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Parallel-Plate Capacitor: A tiny 0.0250-µg oil drop containing 15 excess electrons is suspended between two horizontally closely-spaced metal plates that carry equal but opposite charges on their facing surfaces. The plates are both circular with a radius of 6.50 cm. (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 C)(a) How much excess charge must be on each plate to hold the oil drop steady?(b) Which plate must be positive, the upper one or the lower one?
What will be an ideal response?
What are the two families of fundamental particles out of which all ordinary matter is made?
A) protons and neutrons B) leptons and quarks C) electrons and neutrinos D) quarks and neutrinos E) leptons and photons
Where must an object be placed with respect to a converging lens of focal length 30 cm if the image is to be virtual, and three times as large as the object?
What will be an ideal response?
Specific heat capacity of ice = 2,000 J/kg-°C latent heat of fusion of water = 334,000 J/kg specific heat capacity of water = 4,000 J/kg-°C A 1 kg block of ice is removed from a freezer where its temperature was –10°C. The amount of heat absorbed by the ice as it warms to 0°C is __________
Fill in the blank(s) with correct word