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adelina 88 [10]
3 years ago
8

A runaway train with a mass of 6,251 kg is approaching the end of the line at a speed of 27 m/s. The end of the line has a massi

ve spring with a spring constant of 48,979 Nm. How far will the spring be compressed (in meters) when the train comes to rest
Physics
1 answer:
stiv31 [10]3 years ago
7 0

Answer:

The compression in the spring is 9.64 meters.

Explanation:

Given that,

Mass of the train, m = 6251 kg

Speed of the train, v = 27 m/s

Spring constant of the spring, k = 48979 N/m

We need to find the compression in the spring when it comes to rest. It is a case of conservation of energy. The kinetic energy of the train is converted to elastic potential energy. So,

\dfrac{1}{2}mv^2=\dfrac{1}{2}kx^2

x is compression in spring

mv^2=kx^2\\\\x=\sqrt{\dfrac{mv^2}{k}} \\\\x=\sqrt{\dfrac{6251\times (27)^2}{48979 }}\\\\x=9.64\ m

So, the compression in the spring is 9.64 meters.

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A 62 kg skydiver moving at terminal speed falls 50 m in 1 s. What power is the skydiver expending on the air?
IgorLugansk [536]

Answer:

P = 30380 W

Explanation:

given,

mass of the skydiver, m = 62 Kg

distance, s = 50 m

time, t = 1 s

we know,

Power= \dfrac{work\ done}{time}

Power= \dfrac{F.s}{t}

F = m g

Power= \dfrac{m g.s}{t}

inserting all the values

P = \dfrac{62\times 9.8\times 50}{1}

P = 30380 W

hence, Power the skydiver expending on the air is 30380 W

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3 years ago
Which type of radio waves have the highest frequency and are used in radar detection? microwaves x-rays waves infrared waves gam
goldfiish [28.3K]

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Explanation:

RADAR stands for radio detection and ranging.  Radio waves range from 300 GHz to 30 Hz. Modern radar uses higher frequency of waves for detection. These waves are microwaves (300 MHz-300 GHz). Microwaves are types of radio waves and are used in the radar detection.

The electromagnetic wave which has highest frequency is gamma wave but it is not used for radar detection.

Hence, the correct answer is microwaves are the type pf radio waves which have the highest frequency and are used in radar detection.

5 0
3 years ago
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Which of the following statements is false?
Allushta [10]

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MakcuM [25]

Answer:

I believe the answer is triangle

Hope it helps!

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Shtirlitz [24]
99.0km/h =27.5m/s (this is the initial speed)
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The distance is 50.0m
Therefore you use the formula:
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