<span> S = k ln(W)
= 1.38*10^-23 J/K * ln(4)
= 1.91*10^-23 J/K</span>
so it will be c
Answer:
The P.E of the pendulum is, P.E = 15 J
Explanation:
Given data,
The length of the pendulum, l = 3 m
The maximum angular displacement from vertical, Ф = 10°
The K.E at its lowest position is, K.E = 20 J
The total mechanical energy of the system is equal to the sum of its K.E and P.E
E = K.E + P.E
At the lowest position P.E = 0
Therefore, The total mechanical energy,
E = 20 J
When the K.E of the pendulum is K.E = 5 J
E = K.E + P.E
P.E = E - K.E
= 20 - 5
= 15 J
Hence, the P.E of the pendulum is, P.E = 15 J
For all elastic collisions we have
also by momentum conservation we will have
since two cars are identical so we know that
now by solving two equations we will have
so the correct answer must be
It attains the same speed as the first car.
B.
We know that the definition of acceleration is the rate of change of velocity. Moreover, velocity is a vector quantity, so it has both magnitude and direction. While moving in a circle, the direction of the car's velocity is constantly changing. This change means that the velocity of the car is changing. Because the velocity is changing, the car is accelerating, despite the magnitude of the velocity remaining the same.
Answer:
0.54m
Explanation:
Step one:
given data
length of seesaw= 3m
mass of man m1= 85kg
weight = mg
W1= 85*10= 850N
mass of daughter m2= 35kg
W2= 35*10= 350N
distance from the center= (1.5-0.2)= 1.3m
Step two:
we know that the sum of clockwise moment equals the anticlockwise moment
let the distance the must sit to balance the system be x
taking moment about the center of the system
350*1.3=850*x
455=850x
divide both sides by 850
x=455/850
x=0.54
Hence the man must sit 0.54m from the right to balance the system