Answer:
1st is magnetic waves. second one is air.
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.
Answer:
The correct option is;
The sports car, because it has less mass and therefore less inertia
Explanation:
Newton's first law of motion states that an object will continue in its state of rest or uniform motion in a straight line unless acted on by a force. The property exhibited by the object is known as inertia
Newton's second law states that force is directly proportional to the rate of change of momentum produced
The rate of change of momentum of an object is directly proportional to the resultant force applied and is in the direction of the resultant force. The resultant force is equal to the rate of change of momentum.
Therefore, we have;
F = m·dv/dt = m×a
Given that the force required to move an object is directly proportional to its mass therefore, the inertia or the object resistance that requires a force to bring change is directly proportional to the mass of the object.
The mass of a sports car being considered lesser than the mass of the minivan will require less force to push and therefore has less inertia.
Answer:
Maximum height is20m and time taken will be 2second
Explanation:
vi=20m/s
vf=0m/s
g=10m/s^2
Using third equation for objects falling freely
2gh=(vf)^2-(vi)^2
Putting values
2(10m/s^2)h=(0m/s)^2-(20m/s)^2
20h=400m
h=20m
Now we have to find the time
Using first equation of motion for objects falling down freely
vf=vi+at
substituting the equation
(vf-vi)/g=t
(0-20)/10=t
t=2second
Over time, the substances will reach equilibrium, meaning the heat calories lost by Substance 1 will be gained by Substance 2. Therefore, Substance 2 will eventually gain 40 calories of heat.
