Answer:
The rotational kinetic energy of the rotating wheel is 529.09 J
Explanation:
Given;
moment of inertia I = 0.35kg⋅m²
number of revolutions = 35.0
time of revolution, t = 4.00 s
Angular speed (in revolution per second), ω = 35/4 = 8.75 rev/s
Angular speed (in radian per second), ω = 8.75 rev/s x 2π = 54.985 rad/s
Rotational kinetic energy, K = ¹/₂Iω²
Rotational kinetic energy, K = ¹/₂ x 0.35 x (54.985)²
Rotational kinetic energy, K = 529.09 J
Therefore, the rotational kinetic energy of the rotating wheel is 529.09 J
Answer:
The correct answer is a. Both are the same
Explanation:
For this calculation we must use the gravitational attraction equation
F = G m M / r²
Where M will use the mass of the Earth, m the mass of the girl and r is the distance of the girl to the center of the earth that we consider spherical
To better visualize things, let's repair the equation a little
F = m (G M / r²)
The amount in parentheses called acceleration of gravity, entered the force called peos
g = G M / r²
F = W
W = m g
When analyzing this equation we see that the variation in the weight of the girl depends on the distance, which is the radius of the earth plus the height where the girl is
r = Re + h
Re = 6.37 10⁶ m
r² = (Re + h)²
r² = Re² (1 + h / Re)²
Let's replace
W = m (GM / Re²) (1+ h / Re)⁻²
W = m g (1+ h / Re)⁻²
This is the exact expression for weight change with height, but let's look at its values for some reasonable heights h = 6300 m (very high mountain)
h / Re = 10
⁻³
(1+ h / Re)⁻² = 0.999⁻²
Therefore, the negligible weight reduction, therefore, for practical purposes the weight does not change with the height of the mountain on Earth
The correct answer is a
Answer:
momentum
Explanation:
when something starts rolling momentum keeps it going.
Answer:
They are spherical and hollow (not compact or dense)
Explanation:
An elastic collision is a form of a collision where kinetic energy and momentum are conserved in the process. When there is zero loss of kinetic energy and momentum, it is called a perfectly elastic collision.
This form of collision is observed in atmospheric gases and colliding balls which happens to be spherical and hollow.
