Answer:
correct answer is 3(Is it the most unusual rock in the area)
Explanation:
Option 1:
During the formation of a rock some quantity of radioactive elements mixed with it. By measuring the quantity of this radioactive element scientist can determine the age of the rock which is known as absolute age.
option 2:
Throgh scientific investigation scientist can determine the types of minerals which make up the rock
option 3:
Through scientific investigation scientist cannot determine whether the rock is the most unusual or not. It can be determine by just looking all the rock in the area.
Option 4
Through scientific investigation the weight of the rock can be determine and it can be determine whether it is the heaviest rock in the backyard.
Answer:
Kinetic energy is equals to 0.5mv² where m is the mass in
kilograms and v is the velocity in ms-1
So, for a bicycle of 10kg moving at 10ms-1,
K.E
= 0.5mv²
= 0.5(10)(10²)
= 500 J
Explanation:
an unexpected visitor as it begins making you feel uncomfortable but it's get calm
Hi!
Convex mirrors always form virtual images regardless of object position and the image is formed behind the mirror in both cases I.e. at infinity and between infinity and the pole. The image is diminished in both the cases.
Concave mirrors form a virtual image when the object is placed in between the Principal focus and the Pole and the image is formed behind the mirror. The virtual image is enlarged in this case. In all other object positions I.e. at infinity, beyond Center of curvature, at Center,between centre of curvature and principal focus and at principal focus, a real and an inverted image of the object is formed.
The ray diagrams for all the positions for the object in concave and convex mirrors are given below:
Answer:
Explanation:
Given
Train travels towards south with a velocity if 
Rain makes an angle of
with vertical
If an observer sees the drop fall perfectly vertical i.e. horizontal component of rain velocity is equal to train velocity
suppose
is the velocity of rain with respect to ground then



Therefore velocity of rain drops is 27.36 m/s