Answer:
The net power needed to change the speed of the vehicle is 275,000 W
Explanation:
Given;
mass of the sport vehicle, m = 1600 kg
initial velocity of the vehicle, u = 15 m/s
final velocity of the vehicle, v = 40 m/s
time of motion, t = 4 s
The force needed to change the speed of the sport vehicle;
![F = \frac{m(v-u)}{t} \\\\F = \frac{1600(40-15)}{4} \\\\F = 10,000 \ N](https://tex.z-dn.net/?f=F%20%3D%20%5Cfrac%7Bm%28v-u%29%7D%7Bt%7D%20%5C%5C%5C%5CF%20%3D%20%5Cfrac%7B1600%2840-15%29%7D%7B4%7D%20%5C%5C%5C%5CF%20%3D%2010%2C000%20%5C%20N)
The net power needed to change the speed of the vehicle is calculated as;
![P_{net} = \frac{1}{2} F[u + v]\\\\P_{net} = \frac{1}{2} \times 10,000[15 + 40]\\\\P_{net} = 275,000 \ W](https://tex.z-dn.net/?f=P_%7Bnet%7D%20%3D%20%5Cfrac%7B1%7D%7B2%7D%20F%5Bu%20%2B%20v%5D%5C%5C%5C%5CP_%7Bnet%7D%20%3D%20%5Cfrac%7B1%7D%7B2%7D%20%5Ctimes%2010%2C000%5B15%20%2B%2040%5D%5C%5C%5C%5CP_%7Bnet%7D%20%3D%20275%2C000%20%5C%20W)
Answer:
The differences between the Lincoln, Johnson, and Congress Reconstruction plans include: Although both the Lincoln and Johnson plan were open to readmission of the southern States, Congress claimed that the two administrations were too lenient and sought stiffer punishment for the States
The aspect of Abraham Lincoln's plan for reconstruction in the South that made it differ from the plan of congressional leaders was that Lincoln's plan was more focused on helping the South rebuild than on punishing it and the Radical Republicans' reconstruction offered all kinds of new opportunities to African Americans, including the vote (for males), property ownership, education, legal rights, and even the possibility of holding political office. By the beginning of 1868, about 700,000 African Americans were registered voters.
Reconstruction encompassed three major initiatives:
1. restoration of the Union
2. transformation of southern society
3.enactment of progressive legislation favoring the rights of freed slaves
Answer:6.298,4.1,1.9015
Explanation:
Wavelength=![\frac{velocity of sound }{frequency}](https://tex.z-dn.net/?f=%5Cfrac%7Bvelocity%20of%20sound%20%7D%7Bfrequency%7D)
=
=4.397 m
Distance of 3rd speaker from speaker A is x
From B 78-x
Difference between the distances must be a whole number of wavelengths
First
for 1 st wavelength
2x=8.2+4.397=12.597
x=6.298m
second
For zero wavelength
![x-\left ( 8.2-x\right )=0](https://tex.z-dn.net/?f=x-%5Cleft%20%28%208.2-x%5Cright%20%29%3D0)
2x=8.2
x=4.1m
Third
![\left ( 8.2-x\right )-x=4.397](https://tex.z-dn.net/?f=%5Cleft%20%28%208.2-x%5Cright%20%29-x%3D4.397)
x=1.9015 m