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
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.
Answer:
friction force is the force that slow down motions
Answer:
40mph
Explanation:
1st leg DATA:
time = 3 hrs ; speed = r mph ; distance = 3r miles
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2nd leg DATA:
speed = r mph ; distance = 12 miles
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3r + 12 = 132
3r = 120
rate = 40 mph
Answer: The answer is A
Explanation: There is a strong relationship between them because if you get more sleep then you will have more energy and focus more on the exam.
Answer: A. The flask would probably feel cooler than before the reaction started.
Explanation: An endothermic reaction is a type of of chemical reaction in which energy is absorbed from the surroundings. The temperature of the surrounding decreases.
An Exothermic reaction is a type of of chemical reaction in which energy is released into the surrounding. The temperature of the surrounding increases.
When an endothermic reaction takes place in the flask, the heat is absorbed by the flask and thus the temperature of the surrounding (here the flask) will decrease which can be felt by touching the outside of the test tube. Thus the flask would appear colder.