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garri49 [273]
3 years ago
9

You are driving to the grocery store at 18 m/s. You are 120 m from an intersection when the traffic light turns red. Assume that

your reaction time is 0.50 s and that your car brakes with constant acceleration.
What magnitude braking acceleration will bring you to a stop exactly at the intersection?
Physics
1 answer:
andrew-mc [135]3 years ago
8 0

Answer:

11.64225 m

Explanation:A = 45 m/s – 15m/s / 6s  

A = 5m/s^2

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O
Sergio [31]

see

below

Explanation:

refractive index = speed of light in vacuum / speed of light in medium

light travels at a speed of 3.0 x 10^8 m/s in vacuum

refractive index = 3.0 x 10^8 / 2.0 x 10^8

refractive index = 1.5

hope this helps, please mark it

4 0
3 years ago
Sean, after being so happy for two full days that he reported he "never needed much sleep," now is stating he is so sad that he
Kaylis [27]
D or A i'm not that sure
5 0
3 years ago
Read 2 more answers
A block of aluminium of density 7900 kg/m3 has a volume of 250 cm. Find the<br>mass of the block.​
pashok25 [27]

Answer:

mass of block=2.7 gm

Explanation:

concept: Density=mass/volume

given:ρ=2700 kg/m^3 and v=250 cm^3 (in cm^3 not in m^3)

=> v= convert cm^3 to m^3

there fore= 1 cm^3=1 cm*1 cm*1 cm

i.e 1 cm^3=1/100*1/00*1/100 m^3 => 1 cm^3=1/1000000 m^3

ρ=m/v

=>mass=ρ*volume

=>mass=2700*1/10^-6

=>mass=2.7*10^-3 kg =>2.7 gm

8 0
3 years ago
A student moves a horseshoe magnet by hand across a tabletop to varying distances from an electromagnet, as shown in the diagram
Sloan [31]

The closer together they are the harder it is to hold on to because the magnetic field is stronger as it gets closer.


Answer:

D. The electromagnet's magnetic field is stronger close to it than far from it.​

4 0
2 years ago
Read 2 more answers
An Airplane taxis onto the runway going at 10 m/s. If it can accelerate steady at 3
kirza4 [7]

Answer: 1333 m

the length of runway it will need is S = \frac{90^{2}-10^{2}  }{2.3}=1333 (m)

Explanation:

4 0
3 years ago
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