8.0 grams of water initially at 100°C are poured into a cavity in a very large block of ice initially at 0°C. How many g of ice melt before thermal equilibrium is attained?
A) 10 g
B) 900 g
C) 500 g
D) 100 g
E) an unknown amount; it cannot be calculated without first knowing the mass of the block of ice
D
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Size of the Nucleus: What should be the approximate diameter (in fm) of a nucleus containing 92 protons and 143 neutrons?
Fill in the blank(s) with the appropriate word(s).
A 75 kg road bicycle racer rides down the highway from Pike’s peak. During one stretch of the ride, he descends 150 m while accelerating from 35 km/hr to some 45 km/hr. What work was done by friction and air resistance during this descent?
A. 27.5 kJ B. 70.0 kJ C. 50.2 kJ D. 23.9 kJ E. 36.7 kJ F. 40.3 kJ
An object of mass 4 kg is thrown vertically upwards from ground level with an initial speed of 20 m/s. Ignore friction and use g = 10 m/s2. What is the kinetic energy of the object as it reaches its maximum height?
A) 800 J B) 400 J C) 200 J D) 0 J E) 80 J
When an unstable Co nucleus undergoes beta decay, the nucleus formed is that of
a. Co. b. Cu. c. Fe. d. Mn. e. Ni.