ch 4 hw 4

# ch 4 hw 4 - Ch4 HW4 f10 Page 1 of 5 WebAssign Ch4 HW4...

This preview shows pages 1–3. Sign up to view the full content.

Web Assign Ch4 HW4 f10 (Homework) Ashlyn Baum Physics 303K, section B, Fall 2010 Instructor: Jim Chelikowsky Current Score : 23 / 29 Due : Thursday, September 30, 2010 11:30 PM CDT 1. 1.5/1.5 points Question: MI3 4.10.X.011 2. 4/4 points Question: MI3 4.10.X.012 3. 2.5/2.5 points Question: MI3 4.11.X.072 A ball whose mass is 1.8 kg is suspended from a spring whose stiffness is 5 N/m. The ball oscillates up and down with an amplitude of 14 cm. The due date for this assignment is past. Your work can be viewed below, but no changes can be made. View Key If an object is moving with constant momentum 11 , 14 , 5 kg · m/s, what is the rate of change of momentum d / dt ? d / dt = (kg · m/s)/s What is the net force acting on the object? net = N The velocity of a ball changes from 7 , 4 , 0 m/s to 6.92 , 4.32 , 0 m/s in 0.04 s, due to the gravitational attraction of the Earth and to air resistance. The mass of the ball is 140 grams. (a) What is the acceleration of the ball? = -2 , -8 , 0 (m/s)/s (b) What is the rate of change of momentum of the ball? d / dt = -0.28 , -1.12 , 0 (kg · m/s)/s (c) What is the net force acting on the ball? net = -0.28 , -1.12 , 0 N Page 1 of 5 Ch4 HW4 f10 11/21/2010 http:[email protected][email protected] ..

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
(a) What is the angular frequency? = 1.667 radians/s (b) What is the frequency? f = 0.26525 hertz (cycles per second) (c) What is the period? T = 3.769 s (d) Suppose this apparatus were taken to the Moon, where the strength of the gravitational field is only 1/6 of that on Earth. What would the period be on the Moon? (Consider carefully how the period depends on properties of the system; look at the equation.) T = 3.769 s 4. 3/3 points Question: MI3 4.11.X.073 A mass of 2.9 kg is connected to a horizontal spring whose stiffness is 6.5 N/m. When the spring is relaxed, x = 0. The spring is stretched so that the initial value of x = + 0.18 m. The mass is released from rest at time t = 0. Remember that when the argument of a trigonometric function is in radians, on a calculator you have to switch the calculator to radians
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 11/21/2010 for the course PHY 56665 taught by Professor Chelikowsky during the Fall '10 term at University of Texas.

### Page1 / 5

ch 4 hw 4 - Ch4 HW4 f10 Page 1 of 5 WebAssign Ch4 HW4...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online