A block slides on a table pulled by a string attached to a hanging weight. In case 1 the block slides without friction and in ca
2 answers:
Answer:
In case 2
Explanation:
Thinking process:
The friction is a force that tends to oppose motion.
In case 1, the block slides without friction. This means that the surface is a smooth surface. Thus, the net force needed to pull the string is minimal.
In case 2, there is kinetic friction between the sliding block and the table. Now, the kinetic friction is given by the formula:
where, = coefficient of friction and N = normal force.
Thus, the net force needed:
Thus, the force is larger in case 2.
Therefore, the tension is larger in case 2.
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Answer: The energy absorbed by the reaction from the water is 996 Joules.
Explanation:
Energy absorbed by the reaction or energy lost by the water to the reaction,Q.
Mass of the the reaction ,m = 60 g
Specific heat of water = c = 4.15 J\g ^oC
Change is temperature=
Negative sigh indicates that energy was given by the water to the reaction.
The energy absorbed by the reaction from the water is 996 Joules.
Explanation:
The given data is as follows.
Concentration of caffeine = 2.97 mg/oz
Number of oz in a can = 12 oz
Therefore, the concentration of caffeine in one can is calculated as follows.
= mg
= 35.64 mg
=
Since, it is given that lethal dose is 10.0 g. Hence, number of cans are calculated as follows.
No. of cans =
=
= 280.58
= 281 (approx)
Thus, we can conclude that 281 cans of soda would be lethal.