Answer:
D.The mass and the latent heat of fusion.
Explanation:
When a block of ice is at its melting point, it doesn't need any additional heat in order to reach that temperature. Instead, it needs heat in order to break the bonds between the molecules and change state from solid to liquid. During the phase change, the temperature of the substance does not change, since all the heat provided is used to break the bonds between the molecules.
The heat needed for the phase change is
where
m is the mass of the block
is the latent heat of fusion
Therefore, we see that the correct answer is
D.The mass and the latent heat of fusion.
1) Constant speed
2) Slowing down
3) Not moving
4) Speeding up
Answer:
(a) The aspect of the upper string supporting the weight and the applied force
Student 1 is correct because the upper string is the source of support of the large weight and the force applied to the short string reacts at the support of the long string
(b) The aspect of Student's (2) reasoning that is correct is that the shorter piece of string will always break first, however, the statement is only true for sudden pull due to the increased force experienced by the shorter string from a more rapid change in momentum
(c) The aspect of Student 1's statement that is incorrect is the that the upper string will always break first
The aspect of Student 2's statement that is incorrect is the that the shorter piece of string will always break first
(d) A string will break when subject to a force equivalent to its breaking force. The force experienced by the string increases as the rate of pull (suddenness) increases and the suddenness increases inversely with the length of the string, as such the shorter lower string will break first from a sudden pull before the force of the pull is completely transmitted to the upper string. Whereby the lower string is slowly pulled, the force is evenly transmitted to the upper string which is then taking up the load of the weight and the applied force together and is likely to break first
Explanation:
Denser the medium more the velocity of sound.
Answer:
81.2 A
Explanation:
The magnetic field at the center of a current-carrying loop is given by
where
is the vacuum permeability
I is the current in the loop
R is the radius of the loop
In this problem, we have:
d = 12 cm is the diameter of the loop, so its radius is
R = d/2 = 12/2 = 6 cm = 0.06 m
is the magnetic field at the center
Therefore, the current in the loop must be: