1)Would a windowless spaceship, rotating at constant speed in deep space, qualif
ID: 1272801 • Letter: 1
Question
1)Would a windowless spaceship, rotating at constant speed in deep space, qualify as an inertial reference frame?
yes or no
2)
3)
An astronomer on Earth measures the speed of light coming from the star Sirius, and measures u = c. Meanwhile, the astronomer also sees spaceship A racing by at 0.715c to the right. An observer in ship A sees a scientific research vessel, B, that is moving at 0.650c to the left, as measured from reference frame A. The scientists on research vessel B also measure the speed of light coming from the star Sirius. What speed do they measure? Express your answer as a multiple of c. Hint: you should not have to do any calculations.
4)
Spaceship A and spaceship B are racing toward an airless moon at speeds of 0.15c and 0.85c, respectively. They each fire a pulsed laser as a signaling device, and the speed of each of the pulses is measured on the moon. (a) What is the speed of the pulse received from spaceship A? (b) What is the speed of the pulse received from spaceship B? (a) 0.15c 0.85c 1.00c (1/1 submissions used)
(b) 0.15c 0.85c 1.00c (0/1 submissions used)
3)
An astronomer on Earth measures the speed of light coming from the star Sirius, and measures u = c. Meanwhile, the astronomer also sees spaceship A racing by at 0.715c to the right. An observer in ship A sees a scientific research vessel, B, that is moving at 0.650c to the left, as measured from reference frame A. The scientists on research vessel B also measure the speed of light coming from the star Sirius. What speed do they measure? Express your answer as a multiple of c. Hint: you should not have to do any calculations.
4)
A spacetime event occurs at a location of x = 5.0 m at time t = 1.2Explanation / Answer
1 ) yes
2 ) 0.15c 0.85c 1.00c (0/1 submissions used)
3 )
skipping to the actual question, "The scientists on research vessel B also measure the speed of light coming from the star Sirius. What speed do they measure?"
The anser is c or
299,792,458 metres per second
4 )
Here is my perspective. Sometimes the fundamental ideas of science can be expressed rather easily, take Newton's laws for example. But, there is often more than one way to skin a cat. Energy, at least at the level it appears in introductory textbooks, really is nothing more than Newton's laws expressed from a different point of view. Often in science we find that if we find clever new ways to express some idea, we gain insight and we make problem solving easier. No new fundamental physics is introduced but our whole understanding becomes clarified. That is what energy is, just a new way of looking at things. If we define something called work, it turns out that when we do work on a system we change its energy, and this energy stuff turns out to be very powerful (pun intended). One thing that comes from it is that if we have some system where no work is being done on it, its energy is conserved. And seemingly hard problems become easy. For example, if you have a car sliding down a smooth hill whose shape is unknown but whose height is known, it is trivially easy to find the car's speed at the bottom using energy concepts yet very subtle and tricky to do just using F=ma. The simplest example of work/energy is the isolated particle on which we do work; the thing you change about the particle is
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