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

Physics & Space Science

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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

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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

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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).

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When an unstable Co nucleus undergoes beta decay, the nucleus formed is that of

a. Co. b. Cu. c. Fe. d. Mn. e. Ni.

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