As a protostar evolves from stage 4 to stage 6, it gets hotter but much less bright
Indicate whether the statement is true or false
TRUE
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Two spaceships, each 100 m long in its own rest frame, approach Earth from opposite directions, each with a speed 0.50c relative to Earth. As measured by a passenger in one of the spaceships, how long is the other spaceship?
A) 50 m B) 60 m C) 70 m D) 80 m E) 90 m
Answer the following statement(s) true (T) or false (F)
1. Equation 
implies that a sinusoidal wave’s phase speed depends on its wavelength
As a projectile moves along its parabolic trajectory, which of the following remain constant (ignoring air resistance, and defining the z axis as pointing upward)?
A. Its speed B. Its velocity C. Its x-velocity and y-velocity D. Its z-velocity E. Its acceleration F. Its x-velocity, y-velocity, and acceleration T. Some other combination of the given quantities
Addition by 1. Components: The figure shows three vectors, src="https://sciemce.com/media/4/ppg__cp1pbb0313192044__f15g1q35g6.jpg" style="vertical-align: -5.0px;" />.
, 
, and 
, along with their magnitudes. Determine the magnitude and direction of the vector given by 
- 
- 
What will be an ideal response?