Answer:C
Explanation: I studied, and C is correct
Answer:
I feel like a person should vary their physical activities because it keeps your body in shape and fit and you are able to move around. For example, like running or jogging it helps burn calories and it helps keep your abs/stomach right.
Explanation:
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.
Answer:
the index of refraction for the transparent material is 1.48
Explanation:
let n1 = 1.0 be the refractive index of air and n2 be the refractive index of the trasnparent material.
then:
Snell's Law state that:
n1×sin(∅1) = n2×sin(∅2)
where ∅1 = 56.0° is the angle of incidence and ∅2 = 90 - 56.0 = 34° be the angle refraction.
n1×sin(∅1) = n2×sin(∅2)
n2 = n1×sin(∅1)/sin(∅2)
= (1.0)×sin(56.0°)/sin(34.0°)
= 1.48
Therefore, the index of refraction for the transparent material is 1.48
Friction always shows up as a force in the direction opposite
to the motion, so it always does "negative work". That means
that friction always robs kinetic energy from the moving object.
It never adds any.
Wouldn't it be awesome if friction could do positive work !
That would mean that you could start a ball rolling around a
a circular track, and if the track was coated with just the right
kind of sandpaper, the kinetic energy of the ball would keep
increasing, as friction did work on it. You could drain the extra
kinetic energy away from the ball, leave it enough to keep going,
and sell the extra energy. Bada boom ! Perpetual motion !
