1. What is the rotational speed of the second hand on a clock? 2. A child with a
ID: 2210990 • Letter: 1
Question
1. What is the rotational speed of the second hand on a clock?2. A child with a mass of 57 kg is riding on a merry-go-round. If the child has a speed of 3 m/s and is located 1.4 m from the center of the merry-go-round, what is the child's angular momentum?
3. Given that the carbon atom has a mass of 12 amu, how many carbon atoms are there in a diamond with a mass of 8 g?
4. A liter of water has a mass of 1 kg and the mass of a water molecule is 18 amu. How many molecules of water are there in 2 L of water?
5. An ideal gas has the following initial conditions: Vi = 490 cm3, Pi = 3 atm, and Ti = 100
Explanation / Answer
1. 2pi/60 =0.1047 rad/s 2.239.4 3. 4.015x10^23 4. 669.11x10^23 5.- 19.26 C 6. 750 kg/m^3 7. 8.167 cm3 and l=2.013 cm 8. 230.08 in 9. 450 gms 10. buoyant force on an objec= weight of volume of water displaced 11.4980 calories 12. 1560 J calories of thermal energy are produced by the friction = 373.2 cal 13.16 J 16. 4000 cal = 16.72 KJ 18. 2.8 sec 19. not clear 20. 0.29775 21. 48 cm/s 22. 14.44 m
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