Physics home work 1 (4 questions)

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PHY-121: General Physics I (Fall 2018) Final December 7, 2018 Read all instructions below, before beginning the test. • This is a open book and open notes test. You can use a calculator. • Show all intermediate steps between setting up the problem and the final solution. • Pay attention to the units. Correct answers with wrong units will only get partial credit. 1. A water slide is constructed so that swimmers, starting from rest at the top of the slide, leave the end of the slide traveling horizontally. As the drawing shows, one person hits the water 5.00 m from the end of the slide in a time of 0.578 s after leaving the slide. Ignore friction and air resistance, find the height H in the drawing. · · · (10 − points) Figure 1: Credit: WileyPlus 2. Assuming that the Earth is a solid sphere with uniform mass density and that it orbits the Sun in a perfectly circular orbit, find its rotational kinetic energy about its own axis. (Hint: Refer to the moment of inertia expression for a solid sphere from your textbook. The other astronomical data is available in your textbook table. Make sure that calculations done in class were free from any substitution or math errors.) · · · (10 − points) 1 3. Find the energy consumed by a 60W bulb that was left ON for 5 minutes. How high could a mass of 1kg be lifted vertically (g = 9.8 m ) using this s2 energy? Express your answer in miles. · · · (5 − points) 4. A 5 g bullet fired horizontally at a resting wooden block of mass 1.20kg gets embedded in it, and the bullet-block system slides across the surface for 0.230m . If the coefficient of kinetic friction between the block and the surface is 0.20, find the initial speed of the bullet. (Note:Setup any necessary equations, showing all the steps and clearly define any variables used). · · · (10 − points) 2

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School: University of Virginia

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