Правка разделов «Statement», «Solution», «Answer»
en/1.2.19.md
+4 −4
| @@ -1,6 +1,6 @@ | |||
| ### Statement | |||
| − | $1.2.19.$ The speedometer scale is $15\text{ | ||
| + | $1.2.19.$ The speedometer scale is $15\text{ cm}$ long and measures the vehicle speed from zero to $150~\mathrm{\frac{km}{h}}$. Find the speed of the speedometer indicator if the car is moving at an acceleration of $2~\mathrm{\frac{m}{s^2}}$. | ||
|  | |||
| ### Solution | |||
| Equation for equal accelerated motion | |||
| $$ | |||
| 150 \text{ km/h}=0 \text{ km/h}+at_n | |||
| $$ | |||
| Acceleration time from zero to full speed | |||
| $$ | |||
| t_n=20.83 \text{ s} | |||
| $$ | |||
| @@ -21,17 +21,17 @@Solution | |||
| During this time, the speedometer arrow will travel the distance | |||
| $$ | |||
| − | 15 \text{ | ||
| + | 15 \text{ cm}=ut_n | ||
| $$ | |||
| making the speed equal to | |||
| $$ | |||
| − | u=0.72 \text{ | ||
| + | u=0.72 \text{ cm/s} | ||
| $$ | |||
| #### Answer | |||
| $$ | |||
| − | v = 0.72 \text{ | ||
| + | v = 0.72 \text{ cm/s} | ||
| $$ | |||
| @@ -1,6 +1,6 @@ | |||
| ### Statement | ### Statement | ||
| $1.2.19.$ The speedometer scale is $15\text{ |
$1.2.19.$ The speedometer scale is $15\text{ cm}$ long and measures the vehicle speed from zero to $150~\mathrm{\frac{km}{h}}$. Find the speed of the speedometer indicator if the car is moving at an acceleration of $2~\mathrm{\frac{m}{s^2}}$. | ||
|  |  | ||
| ### Solution | ### Solution | ||
| Equation for equal accelerated motion | Equation for equal accelerated motion | ||
| $$ | $$ | ||
| 150 \text{ km/h}=0 \text{ km/h}+at_n | 150 \text{ km/h}=0 \text{ km/h}+at_n | ||
| $$ | $$ | ||
| Acceleration time from zero to full speed | Acceleration time from zero to full speed | ||
| $$ | $$ | ||
| t_n=20.83 \text{ s} | t_n=20.83 \text{ s} | ||
| $$ | $$ | ||
| @@ -21,17 +21,17 @@Solution | |||
| During this time, the speedometer arrow will travel the distance | During this time, the speedometer arrow will travel the distance | ||
| $$ | $$ | ||
| 15 \text{ |
15 \text{ cm}=ut_n | ||
| $$ | $$ | ||
| making the speed equal to | making the speed equal to | ||
| $$ | $$ | ||
| u=0.72 \text{ |
u=0.72 \text{ cm/s} | ||
| $$ | $$ | ||
| #### Answer | #### Answer | ||
| $$ | $$ | ||
| v = 0.72 \text{ |
v = 0.72 \text{ cm/s} | ||
| $$ | $$ | ||