The planet MARS is visible without a telescope on many clear nights. The planets JUPITER, MERCURY, VENUS and SATURN are also viewable without the aid of magnification.
Sound travels best through solids
Answer:
Refer below.
Explanation:
Refer to the picture for brief explanation.
Velocity (v) is a vector quantity that includes the magnitude and the direction. The magnitude of the quantity is the quotient obtained in dividing the distance (d) by the time (t).
v = d / t
Substituting the known values,
v = (5 km) / (25 minutes) = (5000 m) / (1500 s) =3.33 m/s
Therefore, Walt's velocity is 3.33 m/s due east.
The range, R, of a projectile based on its angle of projection ∅ and velocity v can be directly calculated by:
R = (v²sin2∅)/g
Let the v of ball 1 be v₁
R₁ = (v₁²sin(2*30))/g
v₂ = 2v₁
R₂ = ((2v₁)²sin(2*30))/g
R₂ = 4[(v₁²sin(2*30))/g]
R₂ = 4R₁
So ratio of d2/d1 = 4