Lesson_3.1_Homework

# Lesson_3.1_Homework - Lesson 10 Homework 1 Vector A = 2i 3j...

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1. Vector A = 2 i – 3 j and vector B = -4 i + 6 j . Find A B and the angle between the two vectors. 2. A force F = 3 N i – 5 N j produces a displacement on a particle given by s = 5 m i – 2 m j . Find the work done by the force. 3. What is the work done to raise a 50-kg box to a height of 3.0 m? 4. A tractor exerts a constant force of 4.5 × 10 4 N in moving a load horizontally a distance of 150 m. (i) What is the work done? (ii) If the tractor does this work in 45 s, what is the power developed by its engine? 5. A hot air balloon with a mass of 50 kg ascends at a constant rate of 1.8 ms -1 for 1.2 minutes. What is the work done by the upward buoyant force? 6. A force F x = 15x 3 acts on a particle. Find the work done by the force when the particle is displaced from x = 2.2 m to x = 3.5 m 7. Find the work done to pull a 50-kg crate uniformly 3.5 m up an inclined plane of inclination 37 o if the coefficient of kinetic friction between the crate and the plane is 0.52.

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Lesson_3.1_Homework - Lesson 10 Homework 1 Vector A = 2i 3j...

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