The answer is statement 4. This is the most unique property of water since most materials becomes more dense when it undergoes transition from liquid to solid. However, this is not the case of water. When water freezes it becomes less dense because the hydrogen bonds causes the molecule to push each other farther apart.
Solution :
The angular acceleration, is obtained from the equation of the of rotational motion,
Thus,
or
where is torque, F is force, d is moment arm distance, I is the moment of inertia
Thus,
Now if the force and the moment arm distance are constant, then the
That is when, F = d = constant, then .
Thus, moment of inertia, I is proportional to mass of the bar.
The mass is less for the bar in case (1) in comparison with that with the bar in case (2) due to the holes that is made in the bar.
Therefore, the bar in case (1), has less moment of inertia and a greater angular acceleration.
Question: Initially, the car travels along a straight road with a speed of 35 m/s. If the brakes are applied and the speed of the car is reduced to 13 m/s in 17 s, determine the constant deceleration of the car.
Answer:
1.29 m/s²
Explanation:
From the question,
a = (v-u)/t............................ Equation 1
Where a = deceleration of the car, v = final velocity of the car, u = initial velocity of the car, t = time.
Given: v = 13 m/s, u = 35 m/s, t = 17 s.
a = (13-35)/17
a = -22/17
a = -1.29 m/s²
Hence the deceleration of the car is 1.29 m/s²