1.5 ms\(^{-1}\)
6.0 m s\(^{-1}\)
17.3 m s\(^{-1}\)
24.5 m s\(^{-1}\)
Correct answer is D
v = ?, u = 0, a = 10, s = 30
V² = U²+2as
V² = 0 + 2 * 10 * 30
V² = 0 + 600
V = √600
V = 24.5m/s
rise steadily
fall steadily
fall and then rises
rise and then falls
Correct answer is D
When water is heated, the density rises and falls steadily, remember the anomalous expansion of water.
44.0 m
22.2 m
11.1 m
5.5 m
Correct answer is B
Acceleration[a] = \(\frac{[forward - resistive]force}{mass}\)
a = \(\frac{1240-800}{1220}\) → \(\frac{440-800}{1220}\)
a = 0.36m/s\(^2\), v = 4m/s, s = ?
Second equation of motion:
s is distance
u is initial velocity
v is final velocity
a is acceleration
v\(^2\) = u\(^2\) + 2as
4\(^2\) = 0\(^2\) + 2 * 0.36 * s
16 = 0.72s
22.2m = s
The refracted angle is less than the incident angle if the speed is higher in the first material
Its wavelength does not change
It bends away from the normal if the speed is lower in the first material
Its frequency changes.
Correct answer is D
Refraction occurs when light travels from one medium to another which changes the speed at which the light travels.
This causes light to bend upon incidence with the interface of a new material.
Angle of refraction is smaller than angle of incidence when light ray travels from rarer medium to denser medium.
I.e light can either refract towards the normal(when slowing down while crossing the boundary) or away from the normal (when speeding up while crossing the boundary).
When light undergoes refraction, its frequency remains the same.
Conduction
Diffusion
Convection
Radiation
Correct answer is D
Radiation is energy that comes from a source and travels through space and may be able to penetrate various materials.
Light, radio, and microwaves are good examples