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maks197457 [2]
3 years ago
7

A train crosses a bridge that is 1300 m long in 1 minute and 5 seconds.

Physics
1 answer:
Nat2105 [25]3 years ago
3 0

Answer:

I'm pretty sure it's 20m/s because 1300m divided by 65 seconds is 20 so I think it's 20m/s

Explanation:

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Can someone help with this question pls
morpeh [17]
I solved it and got 374.2N so i would put 375N

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6 0
3 years ago
In each cycle, a heat engine an input of 1940 J of heat and exhausts 1480 J of heat. What is the thermal efficiency?
AleksAgata [21]

Answer:

0.237 (23.7 %)

Explanation:

The thermal efficiency of an engine is given by:

\eta=\frac{W}{Q_{in}}

where

W is the useful work output of the engine

Q_{in} is the heat in input

Here we have:

Q_{in}=1940 J

and the work done is the total heat in input minus the heat exhausted:

W=1940 J - 1480 J=460 J

So, the efficiency is

\eta=\frac{460 J}{1940 J}=0.237 (23.7 %)

8 0
3 years ago
The moving charge in the wire causes the compass to deflect; this is because
JulijaS [17]

The answer is A. the moving charge induces a magnet field .


5 0
3 years ago
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Svet_ta [14]
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8 0
2 years ago
calculate the densities of the following materials. Material A has a volume of 2 cm 3 and mass of 30 g.​
vladimir2022 [97]

Answer:

0.015kgcm^3

Explanation:

density = mass / volume

density = (30/1000) / 2

= 0.015kgcm^3

8 0
3 years ago
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