3 years ago

What experimental evidence led scientists to change from the previous model to this one?

Physics

1 answer:

san4es73 [151]3 years ago

6 0

The colors of light emitted from heated atoms had very specific energies.

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The driver of a car slams on the brakes when he sees a tree blocking the road. the car slows uniformly with acceleration of -5.9

Hatshy [7]

Let u = the speed of the car at the instant when braking begins.

The braking distance is s = 62.3 m, the acceleration is a = -5.9 m/s², and the braking duration is t = 4.15 s.

Use the formula s = ut + (1/2)at² to obtain
(u m/s)*(4.15 s) + 0.5*(-5.9 m/s²)*(4.5 s)² = (62.3 m)
4.15u = 62.3 + 50.8064 = 113.1064
u = 27.2546 m/s

Let v m/s be the speed with which the car strikes the tree.
Then
v = 27.2546 - 5.9*4.15
= 2.7696 m/s

Answer: 2.77 m/s (nearest hundredth)

4 0

3 years ago

It decomposes in a first-order reaction with a rate constant of 14 s–1. how long would it take for an initial concentration of 0

VikaD [51]

The rate constant of a reaction can be computed by the ratio of the changes in the concentration and time take taken for it to decompose. Thus, if the rate constant is given to be 14 M/s, we have

$rate = \frac{-(C_{new} - C_{old})}{t}$

where C are the concentration values and t is the time taken for it to decompose.

$14 = \frac{-(0.02 - 0.06)}{t}$
$t = 0.003 s$

Thus, it will take 0.003 s for it to decompose.
Answer: 0.003 s

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3 years ago

Which of the following is an example of the Doppler effect?

Oliga [24]

b is your answers in this thread

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2 years ago

Phase change occurs in which of the following A. A suspension. B boiling point. C An explosion D Mixing Point

Inessa05 [86]

C I think not totally sure

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3 years ago