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Sidana [21]
3 years ago
12

You are conducting an experiment inside a train car that may move along level rail tracks. A load is hung from the ceiling on a

string. The load is not swinging, and the string is observed to make a constant angle of 45 degrees with the horizontal. No forces other than tension and gravity are acting on the load. Which of the following statements are correct? Choose all that apply. a) The train is an inertial frame of reference b) The train is not an inertial frame of reference c) The train may be instantaneously at rest d) The train may be moving at a constant speed in a straight line e) The train may be moving at a constant speed in a circle f) The train must be speeding up g) The train must be slowing down h) The train must be accelerating
Physics
1 answer:
katrin2010 [14]3 years ago
7 0

Answer:

b

c

e

h

Explanation:

Note that the swing direction was not giving in the question and direction could be sideways (in a turn) or in a track or both

The question show something in common ...acceleration

So let's look at the statements and pick the correct ones

a is false while b is correct as the train is accelerating

c is correct. The train is accelerating even thou the speed could not be ascertained

d is false and not feasible as the train is accelerating

e is true as the train maybe moving at a constant speed in a circle

f is false. This could be constant velocity in a circle. Same as g (false)

h is true. It's accelerating

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What should be angle between force and displacement to get the maximum work​
Bas_tet [7]

Answer:

0°

Explanation:

The angle between force and displacement should be 0° in order to get the maximum work done.

 

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  Ф is the angle between force and displacement

When Ф is zero, the maximum work done is attained

When Ф is 90, the minimum work is done, in fact, work done is 0

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3 years ago
I really need help with this!! Will give brainliest if you help T^T
slava [35]

Answer:

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Butter has a lower melting point than the cheese and the wax. The motion of the cheese were a little separated while the butter articles have more space in between. The wax had the closest particles.

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3 years ago
At the _______________ point, the particles in an object have not kinetic energy
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3 years ago
The World-War II battleship U.S.S Massachusetts used 16-inch guns whose barrel lengths were 15 m long. The shells each of mass 1
Vaselesa [24]

Answer:

The explosive force experienced by the shell inside the barrel is 23437500 newtons.

Explanation:

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Where:

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\Delta s - Barrel length, measured in meters.

m - Mass of the shell, measured in kilograms.

v_{o}, v_{f} - Initial and final speeds of the shell, measured in meters per second.

If we know that m = 1250\,kg, v_{o} = 0\,\frac{m}{s}, v_{f} = 750\,\frac{m}{s} and \Delta s = 15\,m, then the explosive force experienced by the shell inside the barrel is:

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6 0
2 years ago
If three devices are plugged into one port on a switch and two devices are plugged into a different port, how many collision dom
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