What total impulse was imparted by these forces. near earth, Ask an Expert

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Q. Near Earth, the density of protons in the solar wind (a stream of particles from the Sun) is 12.0 cm-3, and their speed is 702 km/s. (a) Find the current density of these protons. (b) If Earth's magnetic field did not deflect the protons, what total current in amperes Earth receive?

Q. A 4.0-N force acts for 3.0 seconds on an object. The force suddenly increases to 15 N and acts for one additional second. What total impulse was imparted by these forces?

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