Answer:
The temperature would fall.
Explanation:
The question can be solved by using first law of thermodynamics.
The law states:
The change in internal energy of the system is equal to the heat energy supplied to the system minus the workdone by the system.
ΔU = Q - W
where ΔU is change in internal energy of the system
Q is energy given to the system
W is workdone by the system
Because the charges are repelling each other it means they will move away from each other and their repulsive forces will do positive workdone (workdone is defined as distance moved in the direction of the force applied). Therefore W > 0.
There is no energy supplied to the system so Q = 0.
Using the relation ΔU = Q - W we can see that if Q = 0 and W > 0 then ΔU < 0. Hence internal energy of the system falls so the temperature falls.
Answer:
D. Both occur between objects independently whether they are in contact or not.
Explanation:
- The gravitational force is a force that is exerted between two (or more) objects having mass. This force is always attractive and its magnitude is given by
where G is the gravitational constant, m1 and m2 are the two masses, and r is the distance between the two masses.
- The electrical force is a force that is exerted between two (or more) objects having electrical charge. It can be either attractive or repulsive, depending on the sign of the two charges, and its magnitude is given by
where k is the Coulomb's constant, q1 and q2 are the two charges, and r the distance between the two charges.
Looking at both formulas, we see that the two forces are present even when the two objects are not in contact with each other (in fact, r can assume any value in the formula). They are said to be non-contact forces. Therefore, the correct option is
D. Both occur between objects independently whether they are in contact or not.
Add more of the liquid because the length is more redemption.
Answer:
Water that contains a larger than normal amount of <em>magnesium</em> is still safe to drink.
Explanation:
Sulfur, lead and arsenic are harmful metals that are toxic to human health. Although magnesium present at high concentrations (above approximately 250 mg/l each) can have a laxative effect. However, data suggest that consumers adapt to these levels as exposures continue.
Answer:
954.88kg
Explanation:
F=ma
Given that,
F = 4106N
and a = 4.3m/s²
By rearranging the equation,
m = F÷a
m = 4106 ÷ 4.3
m = 954.88kg