Answer:
A
Explanation:
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The process of flask becoming cold is due to endothermic reaction.
Answer: Option B
<u>Explanation:</u>
So two kinds of heat transfer can be possible in any chemical reaction. If the sample is considered as system and the sample container is considered as the surrounding, then heat transfer can occur between them.
If the heat is transferred from the surrounding to the system , then it is an endothermic reaction. And in those cases, the sample holder will be becoming colder. This is because the heat from the surrounding that is the container will be utilized to complete the reaction.
While when there is transfer of heat from the system to surrounding , it will be exothermic reaction and the beaker will be getting hot in this process. So in the present case, the container is becoming cold because of occurrence of endothermic process.
Horizontal velocity: 81.9 km/h
Vertical velocity: 57.4 km/h
Explanation:
We can solve this problem by resolving the velocity vector into its component along the horizontal and vertical direction.
The horizontal velocity of the stunt bike is given by:

where
v = 100 km/h is the magnitude of the velocity
is the angle of projection
Substituting, we find

The vertical velocity instead is given by

where


Substituting,

Learn more about vector components:
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Answer:

Explanation:
Given


Required
Determine the mass of the ball
This question will be answered using Newton's second law of motion.
Which states that

Substitute values for Force and Acceleration

Make Mass the subject


--- (approximated)