When 50 g of a certain material at 100°C is mixed with 100 g of water at 0°C, the final temperature is 40°C. What is the specific heat of the material? The specific heat of water is 1.00 kcal/kg ? °C
A) 0.33 kcal/kg ? °C
B) 0.75 kcal/kg ? °C
C) 1.3 kcal/kg ? °C
D) 7.5 kcal/kg ?°C
C
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A vehicle designed to operate on a drag strip accelerates from zero to 34 m/s while undergoing a straight-line path displacement of 48 m. What is the vehicle's acceleration if its value may be assumed to be constant?
a. 9 m/s2 b. 6.0 m/s2 c. 12 m/s2 d. 18 m/s2 e. 24 m/s2
A solid conducting sphere (radius = 5.0 cm) has a charge of 0.25 nC distributed uniformly on its surface. If point A is located at the center of the sphere and point B is 15 cm from the center, what is the magnitude of the electric potential difference between these two points?
a. 23 V b. 30 V c. 15 V d. 45 V e. 60 V
The energy of a system
a. always increases. b. always remains constant. c. decreases when work is done by the system. d. decreases when work is done on the system.
A highly ionized atom with Z = 5 has only one electron left around it, in its ground state. How much more energy is required to finish the job and have a bare nucleus?
A) 13.1 eV B) 10.9 eV C) 340.0 eV D) 68.0 eV