Specific Heats of Selected Materials Material
C (J/kg-K)
Aluminum
897
Concrete
850
Diamond
509
Glass
840
Helium
5193
Water
4181
Q = mcAT
=
Joanna adds 12,000 J of heat to a 10 kg
sample of concrete which had an initial
temperature of 15°C. What was the final
temperature of the concrete after Joanna
added the thermal energy?
a) 1.4°C
b) 13.6°C
c) 16.4°C
d) 15°C

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

Elements on the periodic table are ordered according to their

City b is south of city a, and the 200 mile trip by car takes 4 hours. the cities are 120 miles apart in a straight line. what is the velocity of a trip from city a to city b?