Answer:
68.57 mile/hour
Explanation:
The distance from Yakima to Ellensburg is 50 miles and you travel with 60 miles/hour for the first 25 miles, then 80 miles/hour for the last 25 miles. The easy way to solve this question is to find the total time needed to travel.
The time needed to travel 25 miles with 60 miles/hour speed will be: 25 miles/ (60 miles/hr)= 0.42 hr
The time needed to travel 25 miles with 80 miles/hour speed will be: 25 miles/ (80 miles/hr)= 0.31 hr
Total time needed to travel 50 miles will be: 0.41 hr + 0.31hr = 0.73 hr
The average speed will be:
average speed= sum of travel distance/ sum of time needed= 50 miles/ 0.73hr= 68.57 mile/hr
Explanation:
Solution,
- Mass(m)= 60 kg
- Force (F)= 20 N
- Acceleration (a)= ?
We know that,
- F=ma
- a=F/m
- a=20/60
- a=0.333 m/s²
So, her acceleration is 0.333 m/s².
Applying Concepts: What happens to the volume of a balloon that is taken outside on a cold winter day? ... When the air particles inside the balloon become cooler, they slow down and do not hit the inside of the balloon as often, so the balloon's volume decreases. this is google answer sorry i didnt know how to word it
Answer:
a) R(fw) = 46.75*10⁶ (N)
b) R(rwi) = 70.125*10⁶ [N]
Explanation: See Attached file (the rectangle stands for a jet)
The diagram shows forces acting on the jet
Let R(fw) Reaction of front wheels and
R(rw) Reaction of rear wheels
Now we apply the Stevin relation, for R(fw) and a jet weight as follows
R(fw)/ 4 = 187*10⁶ / 16
Then :
R(fw) = ( 1/4) *187*10⁶ ⇒ R(fw) = 46.75*10⁶ (N)
And e do the same for the reaction on rear wheels
R(rw) / 12 = 187*10⁶ /16 ⇒ R(rw) =(3/4)*187*10⁶
R(rw) = 140,25*10⁶ [N]
The last expression is for the whole reaction, and must be devide by 2
because that force is exerted for two wheels, therefore on each of the two rear wheels the reaction will be:
R(rwi) = 70.125*10⁶ [N]
<span>No. Work is not done if you carry a book across the room
at a constant velocity?
The force applied is perpendicular to the direction of motion. (C)</span>