A block of metal initially at 25°C is submerged in water initially at 75°C in a coffee cup. Which of the following is true? a. The final temperature of the coffee cup will be less than 20°C.
b. The final temperature of the coffee cup will be higher than 25°C but less than 75°C.
c. The final temperature of the coffee cup will be more than 80°C.
d. The final temperature of the coffee cup will be 80°C.
Answers
Answer:
b. The final temperature of the coffee cup will be higher than 25°C but less than 75°C.
Explanation:
We know in thermal equilibrium.
Heat loss by one object = Heat gain by other object.
Now, heat is loss by the object whose temperature is higher than other because heat travels from high temperature to other.
And the object who gain heat its temperature increases till both body reach same temperature.
In this case, water loss heat, therefore its temperature decreases.
Similarly , metal block is at low temperature so its temperature increases.
Therefore , both water and metal block must have temperature less than and
to have thermal equilibrium.
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An atom of sodium-23 (atomic number = 11) with a positive charge of +1 has total number of 10 electron and this atom has 11 protons and 12 neutron.
What is atom?
Protons, neutrons, and electrons make up an atom, with hydrogen being the sole exception since it lacks neutrons.
- Every atom has a nucleus, which is surrounded by one or more electrons.
- Protons and neutrons, together known as nucleons, normally make up the same number of the nucleus.
- Neutrons are neutral, protons are positively charged, and electrons are negatively charged.
Given: An atom of sodium-23 (atomic number = 11) has a positive charge of +1.
So, total number of electrons it have = 11 -1 = 10.
total number of proton it have = 11.
total number of neutron it have = 23 -11 = 12.
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For instance, a heat engine is more efficient when it uses in cold weather because there is a greater temperature difference ( Carnot Efficient )
A heat engine could be less efficient because of friction
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Final answer:
The two variables that affect current in a circuit according to Ohm's law are voltage and resistance. If voltage increases, current increases assuming resistance remains constant. Conversely, if resistance increases, current decreases.
Explanation:
According to Ohm's law, the two variables that affect the amount of current in a circuit are voltage and resistance. If the voltage in a circuit is increased, according to Ohm's law, so is the current, providing the resistance doesn't change. On the other hand, if the resistance in a circuit is increased, the current is reduced.
For instance, if we consider a simple electric circuit with a battery and a light bulb. If the voltage of the battery is increased, more current will flow, and the light bulb will shine brighter. However, if the resistance (for example by adding another light bulb in series) is increased, less current will flow, and the bulbs will be dimmer.
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#pany. Image Credits: () OHM; (b) Rob Matheson
change as they are moved apart?
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b
Answers
Answer:b
Explanation: