The specific heat capacity of copper is three times the specific heat capacity of lead. Equal masses of copper and lead are heated from room temperature to the temperature of boiling water. To achieve this, the amount of heat added to the copper is ___________ the amount of heat added to the lead
a. 1/9
b. 1/3
c. equal to
d. 3 times
e. 9 times
D
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Continued use of the fuels most relied upon in developing countries will eventually lead to ________
a. depletion of soil nutrients b. severe thermal pollution of water c. increased oil prices d. depletion of coal reserves in those countries
An Atwood machine consists of an object of mass of 3.5 kg connected by a light string to an object of mass of 6.0 kg over a frictionless pulley with a moment of inertia of 0.0352 kg ? m2 and a radius of 12.5 cm
If the system is released from rest, what is the speed of the objects after they have moved through 1.25 m if the string does not slip on the pulley? A) 2.0 m/s B) 2.3 m/s C) 4.0 m/s D) 5.0 m/s E) 6.0 m/s
You measure the velocity of an electron to an accuracy of ±22.6 m/s
What is the minimum uncertainty in its position? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg) A) 5.12 µm B) 8.05 ?m C) 4.03 ?m D) 16.1 ?m E) 32.2 ?m
For a projectile launched horizontally, the vertical component of its velocity
A) is zero. B) remains a non-zero constant. C) continuously increases. D) continuously decreases. E) any of the above, depending on position.