It’s dust srry if I am late
Answer:
C) The acceleration is downward during the entire time the ball is in the air.
Explanation:
If we neglect air resistance, there is only one force acting on the ball, which is the force of gravity.
The magnitude of the force of gravity is
F = mg
where m is the mass of the ball and g is the acceleration of gravity. According to Newton's second law, therefore the acceleration of the ball during the entire motion is
![a=\frac{F}{m}=\frac{mg}{m}=g](https://tex.z-dn.net/?f=a%3D%5Cfrac%7BF%7D%7Bm%7D%3D%5Cfrac%7Bmg%7D%7Bm%7D%3Dg)
So, it is equal to the acceleration of gravity (
) and in the same direction (downward). Since this force is constant, then the acceleration is the same during the entire motion, therefore the correct answer is
C) The acceleration is downward during the entire time the ball is in the air.
The specific heat capacity of the metal is ![3000 J/kg^{\circ}C](https://tex.z-dn.net/?f=3000%20J%2Fkg%5E%7B%5Ccirc%7DC)
Explanation:
When a substance absorbs a certain amount of heat, its temperature increases according to the equation:
![Q=mC\Delta T](https://tex.z-dn.net/?f=Q%3DmC%5CDelta%20T)
where
Q is the amount of heat absorbed
m is the mass of the substance
C is its specific heat capacity
is the increase in temperature of the substance
For the metal in this problem, we have:
m = 0.3 kg
Q = 9000 J
![\Delta T = 10^{\circ}C](https://tex.z-dn.net/?f=%5CDelta%20T%20%3D%2010%5E%7B%5Ccirc%7DC)
Therefore, its specific heat is:
![C=\frac{Q}{m\Delta T}=\frac{9000}{(0.3)(10)}=3000 J/kg^{\circ}C](https://tex.z-dn.net/?f=C%3D%5Cfrac%7BQ%7D%7Bm%5CDelta%20T%7D%3D%5Cfrac%7B9000%7D%7B%280.3%29%2810%29%7D%3D3000%20J%2Fkg%5E%7B%5Ccirc%7DC)
Learn more about specific heat capacity:
brainly.com/question/3032746
brainly.com/question/4759369
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Electrons carry a negative charge.
Answer:
Some examples of the uses of a screw are in a jar lid, a drill, a bolt, a light bulb, faucets, bottle caps and ball point pens.
Explanation: