What would happen to the railway lines in hot weather if there are no gaps in the track?

1 answer:

3 0

When it gets hot, rails expand. The gaps in the track allow for it to expand straight, but if there were no gaps, it could expand in unexpected directions, so it could be very dangerous for a train to go over it because they could be bent.

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What is responsible for creating distinct weather patterns?

kupik [55]

The earths atmo.sphere

7 0

4 years ago

A shell is launched with an initial velocity at an angle of 40.0° above horizontal

olasank [31]

Answer:

122.17 m/s

Explanation:

x cos 40 = horizontal velocity

1500 m / x cos 40 = time in the air = 1958.11 / x

x sin 40 = vertical velocity

find when shell vertical velocity = 0 (this is max height....1/2 way through its flight) , the time when it hits the ground will be twice this...

0 = x sin 40 - 9.8 t

t = x sin40 / 9.8 time in the air is twice this = .13118 x

Equate the two times from above to solve for x

1958.11/ x = .13118 x

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2 years ago

Five men push a stalled car with an average force of 400 N per person. Find the mass of the

timama [110]

The mass of the car is 2000 kg

Explanation:

We can solve this problem by using Newton's second law of motion, which states that the net force acting on an object is equal to the product between the mass of the object and its acceleration:

$\sum F = ma$