Answer:
Angular acceleration is defined as the rate of change of angular velocity of a body.
consider the attached figure as shown
It rotates with an angular velocity 
An point inside the object rotates along the path as indicated thus turning by an angle 
in time 't'
Thus we have
physically angular acceleration can be understood as the rate at which the angular speed of any object is changing with time.
Acceleration equals 24 km/s
Average equals 396km/s
Answer: 0.75 g/cm³
Explanation:
FORMULA
Density=mass/volume
-----------------------------------
Given: mass is 300 g, volume is 400 cm³
Density=mass/volume
Density=300/400
Density=3/4
Density=0.75 g/cm³
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Answer:
20. m/s
Explanation:
Draw a free body diagram of the skier. There are three forces: normal force pushing perpendicular to the slope, weight pulling down, and friction force pushing up the slope.
Sum of the forces perpendicular to the slope:
∑F = ma
N − mg cos θ = 0
N = mg cos θ
Sum of the forces parallel to the slope:
∑F = ma
mg sin θ − Nμ = ma
Substituting:
mg sin θ − (mg cos θ) μ = ma
g (sin θ − μ cos θ) = a
Given g = 9.8 m/s², θ = 32°, and μ = 0.15:
a = (9.8 m/s²) (sin 32° − (0.15) cos 32°)
a = 3.95 m/s²
After 5.0 s, the velocity is:
v = at + v₀
v = (3.95 m/s²) (5.0 s) + (0 m/s)
v = 19.7 m/s
Rounded to two significant figures, the skier's velocity is 20. m/s.
Inertia: the plates over the tablecloth will try to stay in the same state of non movement. If there is minimum friction between the tablecloth and the objects standing on it, a rapid movement of the tablecloth does not change the state of the objects.
