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3 years ago

Identify the wave with the shortest wave length.

Physics

2 answers:

Valentin [98]3 years ago

7 0

Answer:

d) gamma

Explanation:

hope i helped

lubasha [3.4K]3 years ago

6 0

Answer:

2nd one

mark me brainliest

Explanation:

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A light-rail commuter train accelerates at a rate of 1.35 m/s2. How long does it take to reach its top speed of 80.0 km/h, start

Alona [7]

Answer:

16.46 seconds.

13.46 seconds

2.67 m/s²

Explanation:

Acceleration = a = 1.35 m/s²

Final velocity = v = 80 km/h = $80\frac{1000}{3600}=\frac{200}{9}\ m/s$

Initial velocity = u = 0

Equation of motion

$v=u+at\\\Rightarrow \frac{200}{9}=0+1.35t\\\Rightarrow t=\frac{\frac{200}{9}}{1.35}=16.46\ s$

Time taken to accelerate to top speed is 16.46 seconds.

Acceleration = a = -1.65 m/s²

Initial velocity = u = 80 km/h= $80\frac{1000}{3600}=\frac{200}{9}\ m/s$

Final velocity = v = 0

$v=u+at\\\Rightarrow 0=\frac{200}{9}-1.65t\\\Rightarrow t=\frac{\frac{200}{9}}{1.65}=13.46\ s$

Time taken to stop the train from top speed is 13.46 seconds

Initial velocity = u = 80 km/h= $80\frac{1000}{3600}=\frac{200}{9}\ m/s$

Time taken = t = 8.3 s

Final velocity = v = 0

$v=u+at\\\Rightarrow 0=\frac{200}{9}+a8.3\\\Rightarrow a=\frac{-\frac{200}{9}}{8.3}=-2.67\ m/s^2$

Emergency deceleration is 2.67 m/s²

3 0

3 years ago

Investigators should collect virtually everything from a crime scene. True or false?

Stels [109]

I think it would be TRUE but I’m not 100% sure.... please let me know if I’m right or wrong

4 0

3 years ago

Read 2 more answers

Which statement best explains why an object weight less on mercury than it does on earth

larisa [96]

This is because planet weigh different amount and force of gravity is different from planet to planet for example if your weigh on earth is 100 pound than on mercury is only 78 pounds

5 0

4 years ago

Convert 4.5 hour into second

KiRa [710]

Answer:

4.5 hours =

16200 seconds

Explanation:

here you go

6 0

3 years ago

Many physical properties, such as force and mass, cannot be measured directly. Rather, some other physical property is measured

Salsk061 [2.6K]

Answer:

u =0.269

Explanation:

To find the coefficient of friction we know the following formula

$F_{f} = uN$

Where

$F_{f}$ = Force of Friction

$u$ = Coefficient of Friction

$N$ = Normal Force

Thus we first find the Normal force (N). Remember that the Normal force is perpendicular to the surface, and is equal to the opposing component of Weight (W). Since the surface here is horizontal, then the Normal force will be equal to the Weight.

$N = mg\\ N = (2.12)(9.8)\\ N = 20.776 N$