Answer:
Cannonball b spends more time in the air than cannonball a.
Explanation:
Starting with the definition of acceleration, we have that:
Since both cannonballs will stop in their maximum height, their final velocity is zero. And since the acceleration in the y-axis is g, we have:
Now, this time interval is from the moment the cannonballs are launched to the moment of their maximum height, exactly the half of their time in the air. So their flying time t_f is (the minus sign is ignored since we are interested in the magnitudes only):
Then, we can see that the time the cannonballs spend in the air is proportional to the vertical component of the initial velocity. And we know that:
Finally, since 
and 
, we can conclude that:
In words, the cannonball b spends more time in the air than cannonball a.
conducted
Conduction occurs when a substance is heated, particles will gain more energy, and vibrate more. These molecules then bump into nearby particles and transfer some of their energy to them. This then continues and passes the energy from the hot end down to the colder end of the substance.
Answer: 40.2m/sec
Work: v=p/m= 5.83kg/0.145k=40.2cm/sec
Answer:An object can be considered a point object if during motion in a given time it covers a distance much greater than its own size.
Explanation:
Answer:
A magnetic tape is being played on a cassette deck. The tension in the tape applies a torque to supply reel. Assuming the tension remains constant during playback, the torque varies as the reel becomes empty because the lever arm gets smaller. Therefore, the torque exerted on the reel by the tape becomes smaller.
Explanation:
Inertia increases and the angular momentum is to remain the constant.
Torque =rFsinФ
r=radius
F=force
Ф=angle between the F and lever arm
