# Question

Vector A has a magnitude of 5.00 units, and B has a magnitude of 9.00 units. The two vectors make an angle of 50.0° with each other. Find A∙B.

## Answer to relevant Questions

For any two vectors A and B, show that A∙B = AxBx + AyBy + AzBz. (Suggestion: Write A and B in unit vector form and use Equations 7.4 and 7.5.)The force acting on a particle varies as in Figure P7.11. Find the work done by the force on the particle as it moves (a) From x = 0 to x = 8.00 m, (b) From x = 8.00 m to x = 10.0 m, and (c) From x = 0 to x = 10.0 m.A 100-g bullet is fired from a rifle having a barrel 0.600 m long. Assuming the origin is placed where the bullet begins to move, the force (in newtons) exerted by the expanding gas on the bullet is 15 000 + 10 000x ─ ...A 3.00-kg object has a velocity (6.00i ─ 2.00j) m/s. (a) What is its kinetic energy at this time? (b) Find the total work done on the object if its velocity changes to (8.00i + 4.00j) m/s. (Note: From the ...A sled of mass m is given a kick on a frozen pond. The kick imparts to it an initial speed of 2.00 m/s. The coefficient of kinetic friction between sled and ice is 0.100. Use energy considerations to find the distance the ...Post your question

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