Answer:
a. 1.5rad/s
b. 0.40J
Explanation:
a. Angular acceleration is obtained by determining the gradient of the straight line.
-The graph perfectly cuts two points[4,4], [2,1]:
#The line's gradient is 1.5
Hence, the rod's angular acceleration is 1.5rad/s
b. Let at t=0, the angular velocity be and at .
#Rotational kinetic energy is determined using the formula:
#Equate the expression to the energy value given:
Hence, the kinetic energy at t=o is 0.40J
By previous elements found in other stars, accurate guesses and lots of studying
Answer: The gravitational potential energy is
8.74 ×10^8Joules
Explanation:
To find the gravitational potential energy between ANY two objects that have mass, such as the Earth and the moon, you need to know the universal gravitational constant (G), the mass of the two objects (M and m), and the center to center distance between them (r).
The equation for determining gravitational potential energy Ug = - GMm/r
Where G = gravitational constant 6.67×10^-11
r = radius of the earth = 6.378×10^6m
M = mass of the earth = 5.97 ×10^24kg
m = mass of object = 14kg
Substituting into the equation
Ug = [( 6.67×10^11)(5.97×10^24)(14)] / (6.378×10^6)
Ug = (5.575×10^15)/(6.378×10^6)
Ug = 8.74 ×10^8 Joules