A package is dropped at time t = 0, homework help

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Name: . . . . . . . . . . . . Due: 6-Jun-2017 Phys 205.104 Summer 2017 Homework #1 Instruction: Show your steps. 1. Problem #46 | Page 53 Serway and Jewett 8th Ed. A package is dropped at time t = 0 from a helicopter that is descending steadily at a speed of v . (a) What is the speed of the package in terms of v , g , and t? (b) What vertical distance d is it from the helicopter in terms of g and t? (c) What are the answers to parts (a) and (b) if the helicopter is rising steadily at the same speed? 2. Problem #60 | Page 53 Serway and Jewett 8th Ed. Two students are on a balcony a distance h above the street. One student throws a ball vertically down at a speed v ; at the same time, the other student throws a ball vertically upward at the same speed. Answer the following symbolically in terms of v , g , h, and t. (a) What is the time interval between when the rst ball strikes the ground and the second ball strikes the ground? (b) Find the velocity of each ball as it strikes the ground. (c) How far apart are the balls at a time t after they are grown and before they strike the ground? 3. Note: To avoid round-o error, compute the numbers at the very end of your solution You're approaching an intersection at 50 km/h. You see the light turn yellow when you are 35 m from the intersection. Assume a reaction time of 0.6 s before braking begins and a braking acceleration of −3.0 m/s2 . (a) Will you be able to stop before the intersection? (b) The yellow light stays on for 3.4 s before turning red. If you continue at 50 km/h without braking, will you make it through the 9.5 -m-wide intersection before the light turns red? 1
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Name: . . . . . . . .
Due: 6-Jun-2017

Phys 205.104 Summer 2017
Homework #
Instruction: Show your steps
1. Problem #46 | Page 53 Serway and Jewett 8th Ed.

A package is dropped at time t = 0 from a helicopter that is descending steadily at a speed of v. (a) What
is the speed of the package in terms of v, g, and t? (b) What vertical distance d is it from the helicopter in
terms of g and t? (c) What are the answers to parts (a) and (b) if the helicopter is rising steadily at the
same speed?
Answer and solution:
d = (1/2)*a*t^2 + v_i*t + d_i
v = a*t + v_i
a = to +g (+9.81 gravity because same direction as your reference directio...


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