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Consider a block (initially at rest) of mass 5 kg on a table top. Assume that the surface is frictionless. Let a pushing force of 50 N directed at an angle of 30o below the horizontal act on the block.
A) Find the acceleration of the block.
B) Find the (normal) force that the table exerts on the block.
Protons in cosmic rays have been observed with kinetic energies as large 2.70 × 108 eV. How fast are these protons moving
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