Answer: 808.24625J
Explanation:
Moment of inertia is the physical quantity, that expresses the tendency of a body to resist angular acceleration. It determines the Torque needed for a desired angular acceleration, about a rotational axis
I = 1/2mr²
I = 1/2(W/g)r²
I = 1/2 * 694/9.8 * 1.96²
I = 1/2 * 272.048
I = 136.024kgm²
Also,
Iα = Fr
136.024α = 61.5*1.96
136.024α = 120.54
α = 120.54/136.024
α = 0.8862 rad/s²
Angular Velocity,
ω = αt
ω = 0.8862*3.89
ω = 3.4473 rad/s
K = 1/2Iω²
K = 1/2*136.024*3.4473²
K = 1/2 * 1616.4925
K = 808.24625J
Answer:
E = 1.1 10⁶ N / C
Explanation:
In this case they indicate that we can approximate the membrane as a parallel plate capacitor, we can use
E =
note that in this case the electric field created by each plate goes in the same direction, they are added
let's calculate
E =
E = 1.1 10⁶ N / C
Answer:
<u>C: Energy </u>
Explanation:
Waves can transfer energy over large distances.
Complete Question:
A basketball player tosses a basketball m=1kg straight up with an initial speed of v=7.5 m/s. He releases the ball at shoulder height h= 2.15m. Let gravitational potential energy be zero at ground level
a) Give the total mechanical energy of the ball E in terms of maximum height hn it reaches, the mass m, and the gravitational acceleration g.
b) What is the height, hn in meters?
Answer:
a) Energy = mghₙ
b) Height, hₙ = 5.02 m
Explanation:
a) Total energy in terms of maximum height
Let maximum height be hₙ
At maximum height, velocity, V=0
Total mechanical energy , E = mgh + 1/2 mV^2
Since V=0 at maximum height, the total energy in terms of maximum height becomes
Energy = mghₙ
b) Height, hₙ in meters
mghₙ = mgh + 1/2 mV^2
mghₙ = m(gh + 1/2 V^2)
Divide both sides by mg
hₙ = h + 0.5 (V^2)/g
h = 2.15m
g = 9.8 m/s^2
V = 7.5 m/s
hₙ = 2.15 + 0.5(7.5^2)/9.8
hₙ = 2.15 + 2.87
hₙ = 5.02 m