Week 3 HW questions - Q1 Which has the larger linear...

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Q1Which has the larger linear momentum: a 2,300-kg houseboat going 9 m/s or a 720-kg speedboat going 25 m/s?Step 1: Write down what you know in symbolic form:
Step 2: Write down what you don't know in symbolic form:Momentum of the houseboat and speedboat.a. Momentum of the houseboat = ?b. Momentum of the speedboat = ?Step 3: Find an equation that contains what you know and what you don't know:
Step 4: Solve the equation for what you don't know:The equation is in the form we need,Step 5: Plug in (substitute) what you know and you will find out what you don't know:
Q2A 4,200-kg truck runs into the rear of a 1,000-kg car that was stationary. The truck and car are locked together after the collision and move with speed 2 m/s. What was the speed of the truck before the collision?
Q3In compressing the spring in a toy dart gun, 0.4 J of work is done. When the gun is fired, the spring gives its potential energy to a dart with a mass of 0.09 kg. (a) What is the dart's kinetic energy as it leaves the gun?Step 1: Write down what you know in symbolic form:a. Work done compressing the spring = potential energy of the system: W = PE= 0.4 JStep 2: Write down what you don't know in symbolic form:a. What is the dart's kinetic energy when it leaves the gun?KE = ?Step 3: Find an equation that contains what you know and what you don't know:

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