How many molecules are in (a) 1.0 cm3 of air at STP and (b) 1.0 cm3 of helium at STP? (R = 8.31 J/mol ? K, NA = 6.022 × 1023 molecules/mol)
What will be an ideal response?
2.7 × 1019 molecules in both cases
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An huge bear and a leaf fall from a tree through the air to the ground below. The force of air resistance is greater on the
A) bear. B) leaf. C) same on each
A magnet of solid metal is placed in a magnetic field. Within the magnet, the magnetic field is greater than that outside (but still oriented in the same direction). The magnet is then heated by an external source to a very high temperature. The magnetic field inside the magnet is now significantly weaker but still greater than the outside field. What kind of magnet is this?
Which of the following could be a stable planetary orbit in a binary system?
A) a large orbit around both stars in a wide binary system B) an orbit close to one of the stars in a wide binary system C) a "figure-of-eight" orbit about both stars in a close binary system D) an orbit close to one of the stars in a close binary system
A 83 g steel ball is released from rest and falls vertically onto a steel plate. The ball strikes the plate and is in contact with it for 0.5 ms. The ball rebounds elastically, and returns to its original height
The time interval for a round trip is 4.00 s. In this situation, assume the plate does not deform during contact. The maximum elastic energy stored by the ball is closest to: A) 16 J B) 24 J C) 32 J D) 48 J E) 64 J