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alexira [117]
3 years ago
10

Your English teacher runs 0.80 km north and 1.20 km west. What is the magnitude of the resultant vector of this position?

Physics
1 answer:
Stella [2.4K]3 years ago
5 0

Answer:

Answer: B

{ \rm{resultant =  \sqrt{ {d _{1} }^{2} +  {d _{2}}^{2}  } }}

  • d1 is 0.80 km
  • d2 is 1.20 km

{ \rm{resultant =  \sqrt{ {(0.80)}^{2} +  {(1.20)}^{2}  } }} \\  = { \rm{ \sqrt{2.80} }} \\ { \boxed{ \mathfrak{ \:  \: answer  = { \rm{1.44 \: km}}}}}

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The driver of a 1750 kg car traveling on a horizontal road at 110 km/h suddenly applies the brakes. Due to a slippery pavement,
Alexeev081 [22]

Answer: a=-2.4525 m/s^2

d=s=190.3 m

Explanation:The only force that is stopping the car and causing deceleration is the frictional force Fr

Fr = 25% of weight

W=mg

W=1750*9.81

W=17167.5

Hence

Fr=\frac{25}{100} * -17167.5\\\\Fr=-4291.875 N

Frictional force is negative as it acts in opposite direction

According to newton second law of motion

F=ma

hence

a=Fr/m

a=-4291.875/1750\\a=-2.4525

given

u= 110 km/h

u=110*1000/3600

u=30.55 m/s

to get t we know that final velocity v=0

v^2=u^2+2as\\0=30.55^2-2*2.4525*s\\s=190.34m

3 0
3 years ago
The sound from a bolt of lightning travelled 4.08 km in 12.0 s. What was the speed
LenaWriter [7]

Answer:

83.67 m/s

Explanation:

Set up a calculation to convert units of measure to what you need.

You have km/s and you need m/s.

4.08km     1000 m         83.67m

-----------  X ----------  =  ---------------   the km will cancel out and you are left

 12.0 s          1 km              s              with m/s

6 0
3 years ago
Where do people get their energy to turn a wheel??
Vesna [10]

Answer:

from food eaten (i.e contain carnlbohyadrates)

5 0
3 years ago
How do you measure the wavelength of a transverse wave?
DENIUS [597]
By looking at how wiggily the bar is lol
8 0
4 years ago
If 1 meter = 3.28 feet, what is the height of the Washington Monument in meters?
jasenka [17]
Since you didn't provide how tall the Monument was, I took the liberty to find it and it is 555 feet tall. So to convert to meters we must divide 555 by 3.28 or multiply it by 0.3048 (this is the method I used).
555 x 0.3048 = 169.164 meters
5 0
4 years ago
Read 2 more answers
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