Answer:
None of the stars give of light that is red-shifted
Explanation:
Motion of the observer or the source will cause a change in the wavelength of a wave. This is known as the Doppler effect. When an object and observer are getting close, blue shift occurs i.e., the wavelength gets shorter. When an object and observer are getting farther red shift occurs i.e., the wavelength gets longer.
Here, both the stars are getting closer to us so blue shift will occur.
If a mass of a neutron is 1 the electron mass is 0.00054386734 and it's charge is negative. Hope this helps! ;)
the answer is c) the speed and direction of travel must be constant
Answer: 4m/s
Explanation:
Mass of girl = m1 = 30kg
Mass of boy = m2 = 25kg
Resultant speed after collision = 1.0m/s
Speed of girl = v1
Speed of boy = v2
Momentum = mass × velocity
m1v1 - m2v2 = mv
30v1 - 25v2 = 1×m
30v1 - 25v2 = m
v1 = (m + 25v2)/30 ...eqn 1
but m1 - m2 = m
m = 30 - 25 = 5kg
v1 = (5 + 25v2)/30 ...eqn 2
v1-v2 = 1m/s
v2 = (v1 - 1)m/s
Substitute for v2 in eqn 2
v1 = [5 + 25(v1 - 1)]/30
30v1 = 5 + 25v1 - 25
30v1 - 25v1 = -20
5v1 = -20
v1 = -4m/s
Because she moved in an opposite direction to the boy, the negative sign is featured on her speed
