A uniform rope hangs from a ceiling. Without tugging on the rope, you give the bottom of the rope a wiggle and a wave travels upward along the rope. What can you say about the speed of the wave as the wave travels up the rope?
What will be an ideal response?
The speed increases because the tension is increasing.
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If 50 g of lead (of specific heat 0.11 kcal/kg ? C°) at 100°C is put into 75 g of water (of specific heat 1.0 kcal/kg ? C°) at 0°C. What is the final temperature of the mixture?
A) 2.0°C B) 25°C C) 50°C D) 6.8°C
Sodium metal is paramagnetic with a dimensionless magnetic susceptibility (?) of 8.48×10-6 . The paramagnetism of sodium metal is due to the rotation of some of the spins of the metal’s free electrons into the direction of the applied magnetic field. The applied magnetic field is equal to 1×105 A/m. Sodium metal is BCC with a lattice parameter of 0.428×10-9 m, and sodium is from Group 1A of the periodic table.
(a) What is the intensity of magnetization or the dipole moment per unit volume? (b) For sodium, what is the number of atoms per unit volume, and what is the number of free electrons per unit volume? (c) What is the dipole moment per sodium atom? (d) Assuming that all of the magnetic susceptibility is due to the orientation of free electron spins, what is the net number of free electron spins per atom oriented in the direction of the applied magnetic field?
Multiplying a 4 significant figure number by a 3 significant figure number and then dividing the product by a six significant figure number yields a number with how many significant figures?
a. 7/6 c. 2 b. 3 d. 13
Suppose that we suddenly discovered that all these years we'd been wrong about the distance from Earth to the Sun, and it is actually 10% greater than we'd thought. How would that affect our estimate of the distance to the Andromeda Galaxy?
A) It would not have any effect on our estimate of the distance to the Andromeda Galaxy. B) It would mean the distance to the Andromeda Galaxy is also 10% greater than we thought. C) It would mean the distance to the Andromeda Galaxy is 10% less than we thought. D) It would mean that all the objects we've assumed are standard candles really are not good standard candles, and therefore that we have no idea of the true distance to the Andromeda Galaxy.