Some forms of cancer can be treated using proton therapy in which proton beams are accelerated to high energies, then directed into a tumour, killing the malignant cells. Suppose a proton accelerator is 5.0 m long and must accelerate protons from rest to a speed of 3.0 × 10" m/s. (a) Determine the magnitude of the acceleration required. (b) Determine the magnitude of the force that must be applied to the protons (note: m, = 1.67 × 10-27 kg). (c) Determine the magnitude of the electric field that could be used to accelerate the protons.
Gravitational force
In nature, every object is attracted by every other object. This phenomenon is called gravity. The force associated with gravity is called gravitational force. The gravitational force is the weakest force that exists in nature. The gravitational force is always attractive.
Acceleration Due to Gravity
In fundamental physics, gravity or gravitational force is the universal attractive force acting between all the matters that exist or exhibit. It is the weakest known force. Therefore no internal changes in an object occurs due to this force. On the other hand, it has control over the trajectories of bodies in the solar system and in the universe due to its vast scope and universal action. The free fall of objects on Earth and the motions of celestial bodies, according to Newton, are both determined by the same force. It was Newton who put forward that the moon is held by a strong attractive force exerted by the Earth which makes it revolve in a straight line. He was sure that this force is similar to the downward force which Earth exerts on all the objects on it.
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