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nagle_phys2020_fa07_lecture9

# nagle_phys2020_fa07_lecture9 - How can we multiply two...

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1 18 1. Vector Dot Product or Scalar Vector Product Multiply two vectors and get an answer that is a scalar! How can we multiply two vectors by each other? A B Project A onto B = |A| cos θ A . B = |A| |B| cos θ θ |A| cos θ 19 Clicker Question A person is pulling a rock with a rope. The tension in the rope is 10 Newtons. After dragging the rock 5 meters, how much work has the person done? A) Work = 10 Joules B) Work = 25 Joules C) Work = 50 Joules D) Work = 100 Joules θ =60 0 W = F . Δ r = |F| | Δ r| cos θ = 10 N 5 m (1/2) = 25 Nm 20 field ext i f W W U U U = + = = Δ Potential Energy and the Relationship with Work…. r Q kQ U f 2 1 = Potential Energy between two electrical charges. 21 r U(r) r U(r) r Q kQ r U 2 1 ) ( = Both cases below are for two point charges separated by a distance r. Which graph is correct for two negative charges? A) Left Plot, B) Right Plot Clicker Question Just like a compressed spring stores potential energy. 22

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nagle_phys2020_fa07_lecture9 - How can we multiply two...

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