Explanation:
Transparent objects do not form shadows. The light passes completely from the transparent objects thus these objects will not form shadow. ... In such objects, the light gets refracted thus, such objects forms shadow. The refraction is also the reason why we can see such objects.
When the roller coaster moves down from the top of the hill, all of its stored potential energy is converted into kinetic energy to move it and when it goes back up the hill it turns kinetic into potential.
Friction is the force that always acts in the opposite direction of the force so, decrease it's magnitude.
That's why, it never speed up an object but always decrease it's speed it up to an extent!
Hope this helps!
Answer:
(A) The ratio between the restoring force and the density of the medium remain constant
Explanation:
The ratio between the restoring force and the density of the medium is equal to the square of the velocity of the wave.
The general formula that relates the displacement and velocity (x = vt) can be written in wave mechanics such that
where f is the frequency, λ is the wavelength, and v is the velocity of the wave.
According to this equation, in order to halve the wavelength by doubling the frequency, the velocity should be constant. Therefore, the correct answer is (A).
Answer:
The 40g mass will be attached at 69 cm
Explanation:
First, make a sketch of the meterstick with the masses placed on it;
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↓ Δ ↓
20 g.................50 cm.................40g
38 cm y cm
Apply principle of moment;
sum of clockwise moment = sum of anticlockwise moment
40y = 20 (38)
40y = 760
y = 760 / 40
y = 19 cm
Therefore, the 40g mass will be attached at 50cm + 19cm = 69 cm
12cm 50 cm 69cm
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↓ Δ ↓
20 g.................50 cm.................40g
38 cm 19 cm