miércoles, 19 de noviembre de 2014

PHYSICS WORK

1. A woman lifts her 100-newton child up one meter and carries her for a distance of 50 meters to the  child’s bedroom. How much work does the woman do?
2. How much work does a mother do if she lifts each of her twin babies upward 1 meter? Each baby weighs 90 newtons.
3.You pull your sled through the snow a distance of 500 meters with a horizontal force of 200 newtons. How much work did you do?

 4.Because the snow suddenly gets too slushy, you decide to carry your 100-newton sled the rest of the way home. How much work do you do when you pick up the sled, lifting it 0.5 meter upward? How much work do you do to carry the sled if your house is 800 meters away?
5. An ant sits on the back of a mouse. The mouse carries the ant across the floor for a distance of 10 meters.Was there work done by the mouse? Explain.
6. You decide to add up all the work you did yesterday. If you accomplished 10,000 newton·meters of work yesterday, how much work did you do in units of joules?
7. You did 150 joules of work lifting a 120-newton backpack.
a. How high did you lift the backpack?
b. How much did the backpack weigh in pounds? (Hint: There are 4.448 newtons in one pound.)
8. A crane does 62,500 joules of work to lift a boulder a distance of 25.0 meters. How much did the boulder weigh? (Hint: The weight of an object is considered to be a force in units of newtons.)
9. A bulldozer does 30,000 joules of work to push another boulder a distance of 20 meters. How much force is
applied to push the boulder?
Publicado por en No hay comentarios:

miércoles, 5 de noviembre de 2014

Momentum PHYSICS

Which is more difficult to stop: A tractor-trailer truck barreling down the
highway at 35 meters per second, or a small two-seater sports car traveling the same speed?
You probably guessed that it takes more force to stop a large truck than a small car. In physics terms, we say that the truck has greater momentum.
We can find momentum using this equation:

momentum = mass of object × velocity of object

Velocity is a term that refers to both speed and direction. For our purposes we will assume that the vehicles are traveling in a straight line. In that case, velocity and speed are the same.
The equation for momentum is abbreviated like this: .p = m × v
Momentum, symbolized with a p, is expressed in units of kg·m/sec; m is the mass of the object, in kilograms; and v is the velocity of the object in m/sec.

Use your knowledge about solving equations to work out the following problems:
1. If the truck has a mass of 2,000 kilograms, what is its momentum? Express your answer in kg·m/sec.
2. If the car has a mass of 1,000 kilograms, what is its momentum?
3. An 8-kilogram bowling ball is rolling in a straight line toward you. If its momentum is 16 kg·m/sec, how fast is it traveling?
4. A beach ball is rolling in a straight line toward you at a speed of 0.5 m/sec. Its momentum is 0.25 kg·m/sec.What is the mass of the beach ball?
5. A 4,000-kilogram truck travels in a straight line at 10.0 m/sec. What is its momentum?

Publicado por en No hay comentarios:

Balancing equations


Balancing Worksheet
1.  H2 +  O2 --->  H2O                        
2.  N2   +   H2  --->   NH3
3.  S8 +  O2 --->  SO3                        
4.  N2   +   O2  --->   N2O
5.  HgO --->  Hg +  O2        
6.  CO2   +   H2O  --->   C6H12O6   +   O2
7.  Zn +  HCl --->  ZnCl2 +  H2
8.  SiCl4   +   H2O  --->   H4SiO4   +   HCl
9.  Na +  H2O --->  NaOH +  H2                
10.  H3PO4  --->   H4P2O7   +   H2O
11.  C10H16 +  Cl2 --->  C +  HCl
12.  CO2   +   NH3  --->   OC(NH2)2   +   H2O
 13.  Si2H3   +   O2  --->   SiO2   +   H2O    
14.  Al(OH)3   +   H2SO4  --->   Al2(SO4)3   +   H2O
15.  Fe +  O2 --->  Fe2O3             
16.  Fe2(SO4)3   +   KOH  --->   K2SO4   +   Fe(OH)3
 17.  C7H6O2 +  O2 --->  CO2 +  H2O    
18.  H2SO4   +   HI   --->   H2S   +   I2   +   H2O
19.  FeS2 +  O2 --->  Fe2O3 +  SO2     
20.  Al   +   FeO   --->   Al2O3   +   Fe
21.  Fe2O3  +  H2  --->   Fe   +   H2O
22.  Na2CO3   +   HCl   --->   NaCl   +   H2O   +   CO2
23.  K   +   Br2  --->    KBr
24.  P4   +   O2   --->   P2O5
25.  C2H2   +   O2  --->   CO2   +   H2O
26.  K2O   +   H2O   --->   KOH
27.  H2O2   --->   H2O   +   O2
28.  Al   +   O2   --->   Al2O3
29.  C7H16   +    O2   --->   CO2    +   H2O
30.  Na2O2   +   H2O   --->   NaOH   +   O2
31.  SiO2   +   HF  --->   SiF4    +    H2O
32.  C   +   H2O   --->   CO   +   H2
33.  KClO3   --->   KCl    +   O2
34.  H3AsO4   --->   As2O5   +   H2O
35.  KClO3   --->   KClO4   +   KCl           
36.  Al2(SO4)3 +  Ca(OH)2 --->  Al(OH)3 +  CaSO4
37.  P4O10    +   H2O   --->   H3PO4
38.  FeCl3   +   NH4OH   --->   Fe(OH)3   +   NH4Cl
39.  Sb   +   O2   --->   Sb4O6               
40.  Ca3(PO4)2   +  6 SiO2  --->   P4O10  +  CaSiO3
41.  C3H8   +   O2   --->   CO2    +   H2O
42.  N2O5   +   H2O   --->   HNO3
43.  Fe2O3   +    CO   --->   Fe   +   CO2    
44.  Al   +   HCl   --->   AlCl3   +   H2
45.  PCl5    +   H2O   --->   HCl   +   H3PO4
46.  H3BO3   --->   H4B6O11    +    H2O
47.  H2S   +   Cl2   --->   S8   +   HCl
48.  Mg   +   N2   --->    Mg3N2
49.  Fe   +   H2O   --->   Fe3O4    +   H2
50.  NaOH   +   Cl2   --->   NaCl   +   NaClO   +   H2O
51.  Li2O   +   H2O  --->   LiOH
52.  H3PO4 +  HCl --->  PCl5 +  H2O
52.  CaC2  +  H2O   --->   C2H2   +  Ca(OH)2
53.  HCl   +   K2CO3   --->   KCl   +   H2O   +   CO2
54.  Fe(OH)3   --->   Fe2O3    +    H2O
55.  Ca(ClO3)2   --->   CaCl2   +   O2
56.  Pb(NO3)2   --->   PbO  +  NO2    +   O2
57.  C2H5OH   +   O2   --->   CO   +   H2O
58.  BaO   +   H2O   --->   Ba(OH)2   
59.  Xe   +   F2   --->   XeF6
60.  Ca   +   AlCl3   --->   CaCl2   +   Al
61.  NH4NO3   --->   N2O   +   H2O
62.  NH3   +   NO   --->   N2   +   H2O
63.  Au2O3   --->   Au   +   O2
64.  H3PO3   --->   H3PO4   +    PH3
65.  C4H10   +   O2   --->   CO2   +   H2O
66.  Fe2O3   +   C   --->   CO   +   Fe              
67.  Fe3O4   +   H2   --->   Fe   +   H2O
68.  FeS   +   O2   --->   Fe2O3   +   SO2    
69.  O2   --->   O3
70.  NH3   +   O2   --->   NO   +   H2O
71.  I2   +   HNO3   --->   HIO3   +   NO2   +   H2
72.  Si   +   S8   --->   Si2S4
73.  C6H6   +   O2   --->   CO2   +   H2O
74.  Hg2CO3   --->   Hg   +   HgO   +   CO2   
75.  C2H5OH   +   O2   --->   CO2   +   H2O
76.  SiC   +   Cl2   --->   SiCl4   +   C
77.  HClO4   +   P4O10   --->   H3PO4   +   Cl2O7
78.  Al4C3   +   H2O  --->  CH4   +   Al(OH)3  
79.  BaCl2   +   Al2(SO4)3   --->   BaSO4   +   AlCl3
80.  V2O5   +   HCl   --->   VOCl3   +   H2O  
81.  (NH4)2Cr2O7   --->   Cr2O3   +   N2   +   H2O
82.  Ag2S  +  KCN  --->  KAg(CN)2  +  K2S
83.  NaHCO3   --->   Na2CO3   +   CO2   +   H2O
84.  Au2S3   +   H2   --->   Au   +   H2S
85.  Fe2(C2O4)3   --->   FeC2O4   +   CO2
86.  ClO2   +   H2O   --->   HClO2   +   HClO3
87.  Ca3P2   +   H2O   --->   Ca(OH)2   +   PH3
88.  KO2    +    CO2   --->  K2CO3   +    O2   
89.  As  +   NaOH  --->   Na3AsO3  +   H2
90.  MgNH4PO4   --->   Mg2P2O7   +   NH3   +   H2O
91.  MnO2   +   HCl   --->   MnCl2   +   H2O   +   Cl2
92.  Pb   +   Na   +   C2H5Cl   --->   Pb(C2H5)4   +   NaCl
93.  Ca(OH)2   +   H3PO4   --->   CaHPO4   +   H2O
94.  Zn   +   NaOH   +   H2O   --->   Na2Zn(OH)4   +   H2
95.  SrBr2   +   (NH4)2CO3   --->   SrCO3   +   NH4Br
96.  Hg(OH)2   +   H3PO4   --->   Hg3(PO4)2   +   H2O
97.  Ca3(PO4)2   +   SiO2   +   C   --->   CaSiO3   +   P4   +   CO
98.  I4O9   --->   I2O6   +   I2   +   O2 (this equation can be balanced with various sets of coefficients)
99.  C2H3Cl   +   O2   --->   CO2   +   H2O   +   HCl
100. (NH4)2Cr2O7   --->   NH3   +   H2O   +   Cr2O3   +   O2
101. Al   +   NaOH   +   H2O   --->   NaAl(OH)4   +   H2
102. NH4Cl   +   Ca(OH)2   --->   CaCl2   +   NH3   +   H2O
103. Al   +   NH4ClO4   --->   Al2O3   +   AlCl3   +   NO   +   H2O
104. H2SO4   +   NaHCO3   --->   Na2SO4   +   CO2   +   H2O
105. Ca10F2(PO4)6   +   H2SO4  --->   Ca(H2PO4)2  +  CaSO4   +   HF
106. Ca3(PO4)2   +   H2SO4  --->   CaSO4   +   Ca(H2PO4)2
107. H3PO4   +   (NH4)2MoO4   +   HNO3   --->   (NH4)3PO4 . 12MoO3   +  NH4NO3   +   H2O
108. C4H10   +  Cl2   +  O2  --->   CO2   +   CCl4   +   H2O
109. C7H10N   +   O2   --->   CO2   +   H2O   +   NO2
110. K4Fe(CN)6 + KMnO4 + H2SO4 ---> KHSO4 + Fe2(SO4)3 + MnSO4 + HNO3 +  CO2+ H2O
112. CaF2 ⋅ 3Ca3(PO4)2 + H2SO4 + H2O ---> H3PO4 + HF + CaSO4 ⋅ 2H2O
Publicado por en No hay comentarios:
Suscribirse a: Entradas (Atom)