Answer:
Star A
Explanation:
μ = proper motion = 1 arcsecond per year
r = 20 light-years = Distance
Transverse velocity
V = 1.45 × μ × r
⇒ V = 1.45 × 1 × 20
⇒ V = 29 km/sec
When r = 10 light-years
V = 1.45 × 1 × 10
⇒ V = 14.5 km/sec
∴ Star A which is 20 light-years from Earth is moving faster compared to Star B which is 10 light-years from Earth.
Answer:
The description is true because the plane has to be moving order for it to fly. :)
Read a book or search up something
Answer:
I think that the centre of mass is the point at which the distribution of mass is equal in all directions, and does not depend on gravitational field. Centre of gravity is the point at which the distribution of weight is equal in all directions, and does depend on gravitational field
Answer:
96.7 s
Explanation:
Time of flight in projectile can be calculated thus:
T = 2 × u × sin ϴ/ g
Where;
T = time of flight (s)
u = initial velocity (m/s)
ϴ = Angle of projectile (°)
g = acceleration due to gravity (9.8m/s²)
Based on the provided information; u = 670m/s, ϴ = 45°
Hence, using T = 2.u.sin ϴ/ g
T = 2 × 670 × sin 45° ÷ 9.8
T = 1340 × 0.7071 ÷ 9.8
T = 947.52 ÷ 9.8
T = 96.68
T = 96.7s