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3 years ago

Please help me with this. Finding speed.

Physics

2 answers:

JulijaS [17]3 years ago

7 0

The speed is 80 m/h you find it by dividing the distance by time

Neporo4naja [7]3 years ago

4 0

What you need is a definition of average speed. Here it is:

   Average speed = (distance covered) / (time to cover the distance) .

For the race car in the question:

Average speed = (200 mile) / (2.5 hour)

   = (200 / 2.5) (mile/hour)

   =    80 miles per hour .

That doesn't seem all that fast for a race-car.
But the math is bullet-proof.

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1. During a medieval siege of a castle, the attacking army uses a trebuchet to hurl heavy stones at the castle walls. If the tre

Grace [21]

Initial velocity u = 40
Angle at launch = 55 degrees
At maximum height v = 0, velocity equation v^2 = u^2 - 2gh,
0 = (40 x sin55)^2 - 2 x 9.81 x h => (40 x 0.819)^2 = 19.62h => h = 32.76^2 /
19.62
Maximum height = 54.7 m
We have v = u - gt => 0 = (40 x sin55) - 9.81 x t => t = 32.76 / 9.81 => t =
3.34 s
Time taken to hit the ground is 2t = 2 x 3.34 = 6.68 s
Distance from castle to trebuchet = utcos55 = 40 x 6.68 x 0.573 = 153.1 m

8 0

4 years ago

Define the refraction index of a

Andrews [41]

Answer:

see below

Explanation:

refractive index of a medium is defined as the ratio of the speed of light in vacuum to the speed of light in medium

critical angle of glass is 42 means that if the angle of incidence inside the glass is 42 degrees, then the angle of refraction in the optically less dense medium will be 90 degrees

hope this helps

6 0

3 years ago

Determine the shortest frequency of light required to remove an electron from a sample of ti metal if the binding energy of tita

Mama L [17]

The correct answer is: shortest frequency = 7.86*10^15 $s^{-1}$

Explanation:
The binding energy of titanium = 3.14*10^6 J/mol
The energy required to remove an electron = (3.14*10^6) /(6.023*10^23) = 5.213*10^-18 J
Where 6.023*10^23 = Avagadro number

Since E = hv

Frequency = v = E/h
E = Energy = 5.213*10^-18
h = Planck's constant = 6.626*10^-34
v = (5.213*10^-18) / 6.626*10^-34)
v = 7.86*10^15 $s^{-1}$ (shortest frequency)

7 0

4 years ago

What is the name of the theory describing how the lithosphere is broken into segments, or plates, which "float" on the asthenosp

kogti [31]

Answer:

C. Plate Tectonics

Explanation:

The theory of plate tectonics is when the lithosphere is separated into plates. These plates move over or float over the asthenosphere. The movement of these plates cause earthquakes and can interact with the volcanic activity.

4 0

3 years ago

An electric current through neon gas produces several distinct wavelengths of visible light. What are the wavelengths (in nm) of

MA_775_DIABLO [31]

Answer:

Explanation:

If a be grating element

a = 1 x 10⁻² / 11000

= .0909 x 10⁻⁵

= 909 x 10⁻⁹ m

for first order maxima , the condition is

a sinθ = λ where λ is wavelength

909 x 10⁻⁹ sin 49.67 = λ₁

λ₁ = 692.95 nm .

λ₂ = 909 x 10⁻⁹ sin 50.65

= 702.91 nm

λ₃ = 909 x 10⁻⁹ sin 52.06

= 716.88 nm

λ₄ = 909 x 10⁻⁹ sin 52.89

= 724.90 nm

692.95 nm , 702.91 nm , 716.88 nm , 724.90 nm .

4 0

3 years ago