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3 years ago

Describe two forms of energy-efficient transportation.

1 answer:

6 0

Electricity which may efficient transportation if you develop your way depending contact metal basis , such as electric train .

-Water is from of heat-energy using solar power which run a turbine may be wheel on a railway path.

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How much time does it take for a rattlesnake to strike its victim if it is strikes at a speed of 1.25 m/s and the victim is exac

Marianna [84]

Answer:

4 seconds

Explanation:

5/1.25=4

6 0

3 years ago

When a hypothesis is tested many times and supported by data, it becomes a __________. control theory solution conclusion

Kitty [74]

I think it would then become a theory

5 0

3 years ago

A force of 200 N stretches a spring 30 cm. What is the spring constant of the spring? How far would this spring stretch with a f

bija089 [108]

Hooke's Law

F = k. Δx

Δx = 30 cm = 0.3 m

200 = k . 0.3

$\tt k =\dfrac{200}{0.3}= 666.6$

the spring stretch for 100 N:

$\tt \Delta x=\dfrac{100}{666.6}=0.15=15\:cm$

4 0

2 years ago

Find the frequency of the 4th harmonic waves on a violin string that is 48.0cm long with a mass of 0.300 grams

Jlenok [28]

Answer:

The frequency of the 4th harmonic of the string is 481.13 Hz.

Explanation:

When a stretch string fixed at both ends is set into vibration, it produces its lowest sound of possible note called the fundamental frequency. Under certain conditions on the string, higher frequencies called harmonics or overtones can be produced.

The frequency of the forth harmonic is the third overtone of the string and can be determined by:

f = $\frac{2}{L}$ $\sqrt{\frac{T}{m} }$

Given that; L = 48.0 cm = 0.48 m,

m = 0.3 g = 0.0003 Kg,

T = 4.0 N,

f = $\frac{2}{0.48}$ $\sqrt{\frac{4}{0.0003} }$

f = 4.1667 × 115.4701

= 481.1252

f = 481.13 Hz

The frequency of the 4th harmonic of the string is 481.13 Hz.

4 0

3 years ago

In order to increase the kinetic energy of a speeding train by 44%, 42MJ of work must be performed (1 MJ = 106 J). If the final

victus00 [196]

Answer:

Explanation:

100 % increase makes an amount 2 times .

44 % increase = 42 MJ

100 % increase = 95.45 MJ

final kinetic energy = 2 x 95.45 MJ

= 190.9 x 10⁶ J

1/2 m v² = 190.9 x 10⁶

.5 x m x 9² = 190.9 x 10⁶

m = 4.71 x 10⁶ kg

= 4710 metric ton .

7 0

3 years ago