A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time th
1 answer:
Answer: D) directed downward.
Explanation:
We know that the constant acceleration of of every-thing is always DIRECT DOWNWARDS because of the to the influence of the gravity of the Earth.
This motion is denoted as free fall motion , where the acceleration due to the gravity is constant .
∴ A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always directed downward.
Hence, the correct answer is D) directed downward..
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Answer:
326149.2 KJ
Explanation:
The heat transfer toward and object that suffered an increase in temperature can be calculated using the expression:
Q = m*cv*ΔT
Where m is the mass of the object, cv is the specific heat capacity at constant volume, which basically means the amount of heat necessary for a 1kg of water to increase 1C degree in temperatur, and ΔT is the change in temperature.
A 65000 L swimming pool will have a mass of:
65000L * = 65000 kg
The specific heat capacity at constant volume of water is equal to 4.1814 KJ/KgC.
We replace the data and get:
Q = m*cv*ΔT = 65000 kg * 4.1814 KJ/KgC * 1.2°C = 326149.2 KJ