The concepts necessary to solve this problem are those given by the kinematic equations of motion. We will apply the speed as a unit of distance traveled in a given time.
The total distance of 50 miles is traveled with a speed of 34mph in the time 
and the distance of another 50 miles is traveled with a speed 66mph in the time 
.
Determine the value of as follows.
Where t=time, d=distance, v= Velocity
Determine the value of as
Therefore the total time taken is
The above result is the total time taken to reach the grandmother's house
Now the average velocity is
Therefore the average speed on the way to grandmother's house is 44.87mph
Answer:
Power = 50204 [watts]
Explanation:
We know that the power is defined by the following expression:
Power = Work/time
where:
Power [watts]
time [seconds]
The work done will be the following:
Work = Force * distance [Joules]
Force[Newtons]
distance[meters]
Force = mass* gravity
Force=290 [kg]*9.81[m/s^2] =2844.9[N]
Work = 2844.9[N]*300[m] = 853470[J]
Therefore
Power = 853470 / 17 = 50204 [watts]
The speed obtained by
the pilot is not accurate since it is measuring the rate of travel in the wind,
true velocity is that compared to the ground. Therefore the speed of the wind
is:
v wind = 165 - 145
v wind = 20 km/h<span>
<span>Therefore the wind velocity = 20 km/h against the plane.</span></span>
Answer:
The correct option is the last option.
Explanation:
Generally, when trying to create a mechanical advantage of a lever for an apparatus or a machine, <u>the load is usually moved closer to the fulcrum</u>. Hence, if a lever has a total length of 12 meters and the fulcrum is placed at 6 meters (the center), the best way (based on the previous statement) to double the mechanical advantage of the lever is <u>to move the fulcrum 4 meters toward the side on which the force is applied</u>. The correct option is the last option.
