Elements are identified by the nuclei of the atoms of which they are made. For example, an atom having six protons in its nucleus is carbon, and one having 26 protons is iron. ... Heavy elements can be formed from light ones by nuclear fusion reactions; these are nuclear reactions in which atomic nuclei merge together. This is how they are formed
Newton's 2nd law of motion says:
Force = (mass) x (acceleration).
In order to accomplish the task described in the question,
you would need
Force = (20 kilograms) x (the desired rate of acceleration) .
Answer:C
Explanation:
When a constant horizontal force is applied to the box, box started moving in the horizontal direction such that it moves with constant velocity
Constant velocity implies that net force on the box is zero
i.e. there must be an opposing force which is equal to the applied force and friction force can serve that purpose.
So option c is the correct choice.
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.