Here the weight is hung from the thread inside the ceiling of train
now the FBD of train is analysed
We can say
now by ratio of two equations we have
this shows that train must be in accelerating condition due to which the thread is making an angle with the vertical
now we will have
2 The train is not an inertial frame of reference.
Since train is accelerating so it must be non inertial frame
5 The train may be moving at a constant speed in a circle.
Since its moving in circle so it is in accelerating condition
8 The train must be accelerating.
Answer:
An electrical charge is created when electrons are transferred to or removed from an object. Because electrons have a negative charge, when they are added to an object, it becomes negatively charged. When electrons are removed from an object, it becomes positively charged
Answer:
The answer is below
Explanation:
The equation for a linear line graph is given by:
y = mx + b, where y and x are variables, m is the slope of the graph and b is the y intercept (that is value of y when x is zero).
The slope (m) of a line passing through two points 
is given by:
A) The first line passes through the point (0, 0) and (10, 60). It is represented as (time, velocity). Hence the slope is:
B) The second line passes through the point (10, 60) and (15, 60). Hence the slope is:
C) The third line passes through the point (15, 60) and (40, -40). Hence the slope is:
D) The third line passes through the point (40, -40) and (55, 0). Hence the slope is:
Tachyons are a putative class of particles which able to travel faster than the speed of light. Tachyons were first proposed by physicist Arnold Sommerfeld, and named by Gerald Feinberg. The word tachyon derives from the Greek (tachus), meaning "speedy.".
Answer:
Waves
Waves can be described as oscillations or vibrations about a rest position. For example:
sound waves cause air particles to vibrate back and forth;
ripples cause water particles to vibrate up and down.
The direction of these oscillations is the difference between longitudinal and transverse waves.
Longitudinal waves
A longitudinal wave is one in which the vibrations of the particles are parallel to the direction in which the energy of the wave travels.
Demonstrating longitudinal waves
Longitudinal waves show areas of compression and rarefaction:
compressions are regions of high pressure due to particles being close together.
rarefactions are regions of low pressure due to particles being spread further apart.
An accelerating electric charge will emit transverse electromagnetic waves. These waves are propagating away in wave fronts that become flatter and flatter as getting further from the source. So they will start to resemble a plane wave
