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Knight - Physics for Scientists and Engineers 1/e (Homework)

James Finch

Physics - College, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score: 1/12

Due: Tuesday, November 9, 2010 20:00 EST

About this Assignment

Question
Points
1 2 3 4 5
0/2 0/4 1/3 0/1 0/2
Total
1/12

Description

Here are some textbook questions from Physics for Scientists and Engineers 1/e by Randall D. Knight published by Addison Wesley. Click here for a list of all of the questions coded in WebAssign.


Instructions

This demo assignment allows many submissions and allows you to try another version of the same question for practice.



1. –/2 points Notes Question: Knight 1.005.
Question part
Points
Submissions
1 2
0/1 0/1
0/50 0/50
Total
0/2
 
(a) What is an "operational definition"?

(b) Give operational definitions of displacement and velocity. Your definition should be given mostly in words and pictures, with a minimum of symbols or mathematics. (Do any drawings on paper. Your instructor may ask you to turn in your work.)


2. –/4 points Notes Question: Knight 2.015.
Question part
Points
Submissions
1 2 3 4
0/1 0/1 0/1 0/1
0/50 0/50 0/50 0/50
Total
0/4
 
(a) What constant acceleration, in SI units, must a car have to go from zero to 48 mph in 8 s?
Enter a number.
 m/s2
(b) What fraction of g is this?
Enter a number.
g
(c) How far has the car traveled when it reaches 48 mph? Give your answer both in SI units and in feet.
Enter a number.
 m
Enter a number.
 ft

3. 1/3 points All Submissions Notes Question: Knight 5.027.
Question part
Points
Submissions
1 2 3
1 0/1 0/1
1/50 0/50 0/50
Total
1/3
 
A 900 kg steel beam is supported by two ropes. Each rope has a maximum sustained tension of 6600 N.


Figure P5.27

Does either rope break? If so, which one(s)?

Your answer is correct.



What is the tension in each rope?
rope 1
Enter a number.
 N
rope 2
Enter a number.
 N


4. 0/1 points All Submissions Notes Question: Knight 8.044.
Question part
Points
Submissions
1
0/1
2/50
Total
0/1
 
Find an expression for the magnitude of the horizontal force F in Figure P8.44 for which m1 does not slip either up or down along the wedge. All surfaces are frictionless. (Use only m_1 for m1, m_2 for m2, g for gravity, and theta for .)
F =
Enter a mathematical expression.
Click here to preview your answer.Your answer is incorrect.
Click here for help with symbolic formatting.


Figure P8.44



5. –/2 points Notes Question: Knight 10.056.
Question part
Points
Submissions
1 2
0/1 0/1
0/50 0/50
Total
0/2
 
A new event has been proposed for the Winter Olympics. An athlete will sprint 100 m, starting from rest, then leap onto a 20 kg bobsled. The person and bobsled will then slide down a 50 m long ice covered ramp, sloped at 20°, and into a spring with a carefully calibrated spring constant of 2300 N/m. The athlete who compresses the spring the farthest wins the gold medal. Lisa, whose mass is 40 kg, has been training for this event. She can reach a maximum speed of 12 m/s in the 100 m dash.


Figure Ex10-56

(a) How far will Lisa compress the spring?
Enter a number.
 m
(b) The Olympic committee has very exact specifications about the shape and angle of the ramp. Is this necessary? If the committee asks your opinion, what factors about the ramp will you tell them are important? (Select all that apply.)



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