Answer:
ΔT = 28.667°C is the answer.
Explanation:
Given, Mass of water = 4.0 kg
Water is heated by = 8 × 10² W = 800 W
Time = 10 min = 10 × 60 = 600 s
Now, using the equation of specific heat,
Q = mcΔT
where c is the specific heat capacity of water = 4186 J/kg°C
Q = Pt
Substituting,
Pt = mcΔT
800 × 600 = 4 × 4186 × ΔT
480000 = 16744 × ΔT
ΔT = 28.667
Temperature increased, ΔT = 28.667°C
Either kinetic energy or a energy transformation of gravitational potential energy to kinetic energy or applied kinetic energy
Answer:
Explanation:
The electrostatic force between the proton and the electron is given by:
where
is the Coulomb constant
is the magnitude of the charge of the proton
is the magnitude of the charge of the electron
is the distance between the proton and the electrons
Substituting the values into the formula, we find
Answer:
See the explanation.
Explanation:
The speeds of sound depend upon the temperature of the medium. As the temperature increased in the afternoon, the speed of sound increases. Then the time taken by reflected sound will be less than 0.1 sec in the afternoon. And to hear an echo the time gap between an original sound and reflected sound must be at least 0.1 sec. That is why the student could not hear the echo at all in the afternoon.
Answer:
C
Explanation:
Because everything on Earth falls at the same speed, the masses of the balls do not matter. Since the acceleration due to gravity is constant, their speeds will both be increasing at the same rate, and therefore the difference in speeds would remain constant until they hit the ground. Hope this helps!
