Explanation:
alike
no contact with the object itself
they can attract objects
they're between 2 objects
difference
source of foundations
type of forces
gravity is only for huge objects
Answer:
a) 19.4 m/s
b) 19 m/s
Explanation:
a) In the given question,
the potential energy at the initial point = Ui = 0
the potential energy at the final point = Uf = mgh
the kinetic energy at the initial point = Ki = 1/2 mv₀².
the kinetic energy at the final point = Kf = 0
work done by air= Ea= fh = 0.262 N
Now, using the law of conservation of energy
initial energy= final energy
Ki +Ui = Kf + Uf +Ea
1/2 mv₀² + 0 = 0 + mgh + fh
1/2 mv₀² = mgh + fh
h = v₀²/ 2g (1 +f/w)
calculate m
m= w/g = 5.29 /9.8
= 0.54 kg
h = 20 ²/ (2 x9.80) x (1 0.265/5.29)
h = 19.4 m.
b) 1/2 mv² + 2fh = 1/2 mv₀²
Vg = 19 m/s
F = m * a = 60kg * 2 m/s^2 = 120 N
<span>It has the same starting and ending point</span>
Answer:
The total distance traveled by the comet is 225000 [km]
Explanation:
In order to determine the travel distance we must use the following kinematics equation:
x = v*t
where:
x = distance traveled [km]
v = velocity = 50000 [km/h]
t = time = 4.5 [h]
x = 50000*4.5 = 225000 [km]
