HW-_Fields_combo_with_other_topics

# 040 kg cart is moving at a speed of 60 ms when it

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A 0.040 kg cart is moving at a speed of 6.0 m/s when it enters a 1.8 x 10 4 N/C electric field that stops the cart in 0.40 m. Determine the electric charge on the cart. 1x10 -4 C (HINT: Remember these problems combine your knowledge of Electric Fields, Newton’s 2 nd Law, and our 1 st 4 math reps of Kinematics. You will have to use all of these in some order.) Since this is only the second time you’ve seen this type of problem, there’s a really big hint…. The order will be kinematics, newton’s 2 nd , then e-field. Kinematics and Newton’s 2 nd are connected by acceleration. Newton’s 2 nd and E-Field are connected by Force. 2) A charge of 4x10 -6 C starts from rest in an electric field with a strength of 520 N/C. After 0.03 s, the charge is traveling at 3.5x10 5 m/s. What is the mass of the charge? 1.78x10 -10 kg 3) A 2 kg mass with charge of 5x10 -3 C starts from rest in an electric field with a strength of 2.4x10 5 N/C. What will its velocity be after 0.4 s? 240 m/s 4) A 0.50 kg cart with charge 3.0 x 10 –6 C slides on a horizontal surface that exerts a 2.0 N friction force on the cart. The cart moves through a 1.0 x 10 6 N/C horizontal constant r E field that points toward the right. If the cart starts at rest, determine its speed after moving 2.0 m. (HINT: remember… the sum of the forces equals mass multiplied by acceleration. 2.83 m/s

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0.5m 5,000 N/C + + + + + + + + q ?
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