The answer to this question is A. As the gas gets hotter, the molecules gain energy and move farther apart, causing the gas to expand. This is because, whenever you heat a substance, (solid, liquid, or gas), the molecules in the substance will always move more rapidly causing the substance to expand and the molecules to move further away from one another.
speed of balloon which is rising upwards with constant speed is

speed of the camera which is thrown up from the ground

the distance between camera and balloon when it is thrown from the ground

now let say after time "t" the camera is catch by her friend in the balloon
So the position of balloon and camera must be same



Solving above quadratic equation we got

So after t = 0.39 s her friend will get her camera on the balloon.
Transformer contains two coils: primary and secondary. They allow change of voltage to lower or higher value. In first case we have step-down and in second case we have step-up transformer.
Formula used for transformer is:

Where:N1 = number of turns on primary coilN2 = number of turns on secondary coilV1 = voltage on primary coilV2 = voltage on secondary coil
In a step-down transformer primary coil has more turns than secondary coil. So the ratio 1:38 means that for each turn on secondary coil we have 38 turns on primary coil.
We can solve the equation for V2:

Secondary coil provides voltage of 3.16V.
Answer:
coordinates of the center of mass for these two rods
(
,
)= (
,
)cm
Explanation:
given
mass of a rod = 2m
length of the rod = 3L
mass of two rods = 2(2m) = 4m
radius = diameter/2 = 
attached is the diagram and solution to the question