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olga_2 [115]
3 years ago
10

Help me with this review question please.

Physics
1 answer:
QveST [7]3 years ago
6 0

Answer:

K E=( mv²)/2

=(60×3.5²)/2

=367.5J

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If you see ##### in a cell, you should
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it's D. Make the column wider

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Dragsters can actually reach a top speed of 145.0 m/s in only 4.45 s. (a) Calculate the average acceleration for such a dragster
astraxan [27]

Answer:

a) 32.58 m/s²

b) 161.84 m/s

Explanation:

Initial velocity = u = 0

Final velocity = v = 145 m/s

Time taken = t = 4.45 s

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a = Acceleration

v=u+at\\\Rightarrow a=\frac{v-u}{t}\\\Rightarrow a=\frac{145-0}{4.45}\\\Rightarrow a=32.58\ m/s^2

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The final velocity is greater than the velocity used to find the average acceleration due to the gear changes. The first gear in a dragster has the most amount of toque which means the acceleration will be maximum. The final gears have less torque which means the acceleration is lower here. The final gears have less acceleration but can spin faster which makes the dragster able to reach higher speeds but slowly.

7 0
3 years ago
Structures on a bird feather act like a diffraction grating having 8000 8000 lines per centimeter. What is the angle of the firs
sammy [17]

Answer:

Angle of first order maximum, \theta=21.19^{\circ}

Explanation:

Given that,

Wavelength of the light, \lambda=452\ nm=452\times 10^{-9}\ m

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n = 1

sin\theta=\dfrac{\lambda}{d}

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So, the angle of the first-order maximum is 21.19 degrees. Hence, this is the required solution.

6 0
3 years ago
The SI unit of refractive index is ___<br>a)km/s. b)m/s. c)sec. d)no unit​
cupoosta [38]

Answer:

d)no unit

Explanation:

refractive index is a unit less quantity.

6 0
3 years ago
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