How much time will you save on a ten mile trip if u travel at 60mph rather than at 55mph?
Answers
Answer:
The time saved on a ten mile trip by traveling at 60 mph instead of 55 mph is 54 seconds
Explanation:
Velocity is a physical quantity that expresses the relationship between the space traveled by an object, the time used for it and its direction. So velocity is the change in position of a body over time:
The mile per hour (mph) is a unit of speed measurement that expresses the number of international miles traveled per hour.
From the definition of speed it can be deduced that the time it takes to travel a certain distance at a constant velocity is:
velocity*time=position
Then, if the position is 10 miles and the velocity is 55 mph:
time=0.1818 hours
If 1 hour is 60 minutes, the time can be expressed as:
time=0.1818 hours*60 minutes= 10.90 minutes
The position is now constant at 10 miles, but the speed is 60 mph. So the time it takes to travel that distance at that speed is:
time=0.166 hours
If 1 hour is 60 minutes, the time can be expressed as:
time=0.166 hours*60 minutes= 10 minutes
To calculate the time you will save, the subtraction of both times obtained is performed:
10.9 minutes - 10 minutes= 0.9 minutes
If 1 minute is 60 seconds, the time can be expressed as:
0.9 minutes*60 seconds= 54 seconds
The time saved on a ten mile trip by traveling at 60 mph instead of 55 mph is 54 seconds
Time = Distance/Rate
for 60 mph
Time = 10 miles/60 mph
= 0.1666 * 60 minutes = 10 minutes
for 55 mph
Time = 10 miles/55 mph
= 0.181818 * 60 minutes = 10.90 minutes
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B. Calcium chloride (CaCl2)
C. Potassium Iodide (KI)
D. Glucose (C6H12O6)
Answers
Answer:
- Option B. Calcium chloride (CaCl₂)
Explanation:
The colligative properties depend on the concentration of particles (molecules or ions) of solute dissolved and not on the identity of the solute.
For your reference the colligative properties are: i) boiling point increase, ii) freezing point depression, iii) vapor pressure lowering, and iv) osmotic pressure.
When the solute is a ionic compound the ionization yields several ions, so for ionic solutes you must predict first the number or ions formed per unit of compound and then predict the effect on the colligative properties: the greater the number of ions per unit of compound the greater the effect on colligative properties.
So, just set the ionization equations for each compound:
- MgSO₄ (aq) → Mg²⁺ (aq) + SO₄²⁻ (aq): 2 ions
- CaCl₂ (aq) → Ca²⁺ (aq) + 2Cl⁻ (aq) : 3 ions
- KI (aq) → K⁺ (aq) + I⁻ (aq): 2 ions
- C₆H₁₂O₆ is a molecular compound, not a ionic one, so it remains s 1 molecule.
Then, since calcium chloride, CaCl₂, produces the greater number of ions it is the solute that productes the greatest effect on colligative properties.
Answer:
D. Calcium chloride (CaCl2)
Explanation:
Founder's Education/ Educere Answer
Answers
C₁ * V₁ = C₂ * V₂
6.0 * 455 = C₂ * 2500
2730 = C₂ * 2500
C₂ = 2730 / 2500
C₂ = 1.092 M
hope this helps!
Answers
Nitrogen dioxide has 2 oxygen atoms
B. water boils.
C. water freezes.
D. molecular motion stops.
Answers
Answers
There are 2 aluminum atoms
Al- 2 atoms*27 <--- 27 is the estimated atomic mass number
S- 3 atoms*32
O-12 atoms*16
multiply that out...
Al- 54 grams +
S- 96 grams +
O- 192 grams+ now lets add everything together
__________
342 grams of Al2(SO4)3. Pretty cool?