Explanation:
u = 0m/s
v = 30m/s
a = 2m/s²
Using Kinematics, we have v = u + at.
Therefore t = (v - u) / a
= (30 - 0) / (2) = 15 seconds. (B)
If earth was not tilted on a axis, we wouldn't have any seasons. we wouldn't have seasons because the axis tilts us towards or away from the sun, and if you're tilted torwards the sun the sun you would have summer. if you're tilted away from the sun, you have winter. if there was no axis, the temperature would be the same all around the earth, so therefore we would not have seasons.
hopefully this helps
Answer:
It is the third-lightest halogen, and is a fuming red-brownliquid at room temperature that evaporates readily to form a similarly coloured gas. Its properties are thus intermediate between those of chlorine and iodine. .
All waves have the same wavelength.
FALSE
All waves may not be of same frequency because all waves are of different energy levels and energy depends on the frequency which is different.
Radio telescopes give us information about the birthplace of a star.
FALSE
Radio telescope is an astronomical instrument consisting of a radio receiver and an antenna system that is used to detect radio-frequency radiation emitted by extraterrestrial sources.
If the wavelength of a wave increases, its frequency also increases.
FALSE
relation between frequency and wavelength is given as
so they are inversely related to each other and hence if wavelength is increased then frequency must have to decrease.
Visible light is a kind of electromagnetic wave.
TRUE
All visible light is a part of electromagnetic waves.
All objects emit electromagnetic waves.
TRUE
Due to thermal vibrations all objects radiate electromagnetic waves of different frequencies.
Answer: The net charge on the sphere is -5.9nC
Explanation:
The electric field outside the conducting solid sphere is given as:
E = (kq)/r^2
Here, q is the net charge on the sphere and r is the distance from the center of the sphere.
The net charge is calculated as follows;
q = Er^2/k
E = 2.7*10^3N/C
r = 14cm = 0.14m
k = 8.99*10^9Nm^2/C^2
q = (2.7*10^3)(0.14^2)/(8.99*10^9)
q = 5.9*10^-9C
= 5.9nC
As the electric field directed radially inward, the net charge on the sphere is negative.
Hence the net charge on the sphere is -5.9nC