Answer:
v=3.649 m/s
Explanation:
Lets start with the force of gravity on the elevator.
But the friction clamp opposes this with a force of 17000 N
So the Net force on the elevator is
Kinetic Energy
The motion will be describe
original Kinetic energy + work done = final kinetic energy + spring energy
Answer:
96 J
Explanation:
KE = (1/2) mv^2
m= 3kg
v= 4 m/s
(We have to calculate the KE of the cart when it is moving twice as fast, so 4x2=8, v=8m/s.)
KE = (1/2)(3kg)(8^2) = 96J
Answer:
a) N = 8.54[rev]; b) v = 21.73 [m/s]; c) T = 4.918[s]; d) 12.2[rev/min]
Explanation:
We know that the arc length is calculated by the following expression:
L = α * r
where:
r = radius = 17 [cm] or 0.17 [m]
α = 360° or 2*pi [rad] = 6.283 [rad]
L = (6.283*0.17) = 1.068 [m] = 106.81 [cm] is the distance travelled in one revolution of the CD
a) N = number of revolutions
N = 913 / 106.81
N = 8.54 [rev]
b ) The speed can be calculated by the following expression:
v = d/t
Where:
d = distance = 913[cm]
t = time = 42[sec]
v = 913/42 = 21.73 [cm/s]
c)
We have the number of revolutions and the time therefore we can calculate the number of revolutions per second
w = 8.54 / 42 =0.2033 [rev/s]
And we know that the period is the reciprocal of the time
T = 1 / 0.2033
T = 4.918 [s]
d )
We need to convert from [rev/s] into [rev/min]
Answer:
A
Explanation:
Energy is stored inside the batteries. Thus it is chemical potential energy