Student Workbook For College Physics Format: Paper
4th Edition
ISBN: 9780134724805
Author: Knight, Randall D., (professor Emeritus)^jones, Br
Publisher: Prentice Hall
expand_more
expand_more
format_list_bulleted
Concept explainers
Textbook Question
Chapter 8, Problem 23P
Experiments using “optical tweezers” measure the elasticity of individual DNA molecules. For small enough changes in length, the elasticity has the same form as that of a spring. A DNA molecule is anchored at one end, then a force of 1.5 nN (1.5 × 10–9 N) pulls on the other end, causing the molecule to stretch by 5.0 nm (5.0 × 10–9 m). What is the spring constant of that DNA molecule?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
Experiments using “optical tweezers” measure the elasticity of individual DNA molecules. For small enough changes in length, the elasticity has the same form as that of a spring. A DNA molecule is anchored at one end, then a force of 1.5 nN (1.5 x 10-9 N) pulls on the other end, causing the molecule to stretch by 5.0 nm (5.0 x 10-9 m). What is the spring constant of that DNA molecule?
To measure the static friction coefficient between a 1.40-kg block and a vertical wall, a spring (k = 770 N/m) is
attached to the block, is pushed on the end in a direction perpendicular to the wall until the block does not slip downward
(see figure). If the spring is compressed by 0.048 m, what is the coefficient of static friction?
I attach a metal block to a vertical spring and it stretches by 6 cm. If I replace the block with another one twice the mass, the spring will stretch
another 3 cm, making the total stretch 9 cm.
another 6 cm, making the total stretch 12 cm.
another 12 cm, making the total stretch 18 cm.
more than another 12 cm.
Chapter 8 Solutions
Student Workbook For College Physics Format: Paper
Ch. 8 - Prob. 1CQCh. 8 - Could a ladder on a level floor lean against a...Ch. 8 - Prob. 3CQCh. 8 - Prob. 4CQCh. 8 - Prob. 5CQCh. 8 - Prob. 6CQCh. 8 - Prob. 7CQCh. 8 - A spring exerts a 10 N force after being stretched...Ch. 8 - Prob. 9CQCh. 8 - A typical mattress has a network of springs that...
Ch. 8 - Take a spring and cut it in half to make two...Ch. 8 - A wire is stretched right to its breaking point by...Ch. 8 - Prob. 13CQCh. 8 - Prob. 14CQCh. 8 - Steel nails are rigid and unbending. Steel wool is...Ch. 8 - Two children hold opposite ends of a lightweight,...Ch. 8 - Prob. 19MCQCh. 8 - Prob. 20MCQCh. 8 - Prob. 21MCQCh. 8 - Prob. 22MCQCh. 8 - Prob. 23MCQCh. 8 - Prob. 24MCQCh. 8 - Prob. 25MCQCh. 8 - Prob. 26MCQCh. 8 - You have a heavy piece of equipment hanging from a...Ch. 8 - Prob. 1PCh. 8 - Prob. 2PCh. 8 - Prob. 3PCh. 8 - Prob. 4PCh. 8 - Youre carrying a 3.6-m-long, 25 kg pole to a...Ch. 8 - Prob. 6PCh. 8 - Prob. 7PCh. 8 - Prob. 9PCh. 8 - Prob. 11PCh. 8 - Prob. 13PCh. 8 - Prob. 14PCh. 8 - Prob. 15PCh. 8 - The stability of a vehicle is often rated by the...Ch. 8 - Prob. 18PCh. 8 - A car manufacturer claims that you can drive its...Ch. 8 - Prob. 20PCh. 8 - An orthodontic spring, connected between the upper...Ch. 8 - Prob. 22PCh. 8 - Experiments using optical tweezers measure the...Ch. 8 - Prob. 24PCh. 8 - One end of a 10-cm-long spring is attached to the...Ch. 8 - Prob. 26PCh. 8 - A spring has an unstretched length of 10 cm. It...Ch. 8 - A spring stretches 5.0 cm when a 0.20 kg block is...Ch. 8 - You need to make a spring scale to measure the...Ch. 8 - Prob. 30PCh. 8 - A force stretches a wire by 1.0 mm. a. A second...Ch. 8 - Prob. 32PCh. 8 - What hanging mass will stretch a 2.0-m-long,...Ch. 8 - An 80-cm-long, 1.0-mm-diameter steel guitar string...Ch. 8 - A mineshaft has an ore elevator hung from a single...Ch. 8 - The normal force of the ground on the foot can...Ch. 8 - A three-legged wooden bar stool made out of solid...Ch. 8 - Prob. 38PCh. 8 - Prob. 39PCh. 8 - Prob. 40PCh. 8 - A glass optical fiber in a communications system...Ch. 8 - The Achilles tendon connects the muscles in your...Ch. 8 - Prob. 44PCh. 8 - Prob. 47PCh. 8 - Prob. 48PCh. 8 - Prob. 49PCh. 8 - Prob. 51GPCh. 8 - Prob. 52GPCh. 8 - Prob. 53GPCh. 8 - Prob. 55GPCh. 8 - Two identical, side-by-side springs with spring...Ch. 8 - Prob. 57GPCh. 8 - Prob. 58GPCh. 8 - Prob. 59GPCh. 8 - A 25 kg child bounces on a pogo stick. The pogo...Ch. 8 - Prob. 61GPCh. 8 - In the hammer throw, an athlete spins a heavy mass...Ch. 8 - There is a disk of cartilage between each pair of...Ch. 8 - Orb spiders make silk with a typical diameter of...Ch. 8 - Larger animals have sturdier bones than smaller...Ch. 8 - Prob. 67GPCh. 8 - Prob. 68GPCh. 8 - Prob. 69MSPPCh. 8 - Prob. 70MSPPCh. 8 - Prob. 71MSPPCh. 8 - Prob. 72MSPP
Additional Science Textbook Solutions
Find more solutions based on key concepts
3. What is free-fall, and why does it make you weightless? Briefly describe why astronauts are weightless in th...
The Cosmic Perspective
A spiral is an ice-skating position in which the skater glides on one foot with the other foot held above hip l...
Essential University Physics (3rd Edition)
An isosceles triangular block of mass m and height h is in stable equilibrium, resting on its base on a horizon...
Essential University Physics: Volume 1 (3rd Edition)
A magician places an aluminum ring on a table, underneath which is hidden an electromagnet. When the magician s...
Conceptual Integrated Science
An 1800-W toaster, a 1400-W speaker, and a 75-W lamp are plugged into the same outlet in a 15-A fuse and 120-V ...
University Physics Volume 2
1. When is energy most evident?
Conceptual Physics (12th Edition)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Review. The mass of a car is 1 500 kg. The shape of the cars body is such that its aerodynamic drag coefficient is D = 0.330 and its frontal area is 2.50 m2. Assuming the drag force is proportional to 2 and ignoring other sources of friction, calculate the power required to maintain a speed of 100 km/h as the car climbs a long hill sloping at 3.20.arrow_forwardBruce Lee was famous for breaking concrete blocks with a single karate chop. From slow-motion video, the speed of his 1.50-kg hand descending on a block was estimated to be 15.0 m/s, which decreased to a speed of 0.500 m/s in the 2.50 103 s during which his hand made contact with and broke through the block. The maximum shear stress a concrete block can be subjected to before breaking is 9.50 105 N/m2. a. What was the force exerted by Lees hand on the block? b. If a typical concrete block broken by Lee was 3.00 cm thick and 15.2 cm wide, what is the shear stress experienced by the concrete block? c. Will the concrete block succumb to Lees karate chop?arrow_forwardA spring with a constant of 300 N/m is stretched 1.5 m. What is the force in the spring? 100 N 50 N 300 N 150 N 450 N 200 Narrow_forward
- Two springs, with force constants k1=140N/m and k2=275N/m, are connected in series, as shown in the figure. When a mass m=0.50kg is attached to the springs, what is the amount of stretch, x?arrow_forwardAn ornament of mass 46.5 g is attached to a vertical ideal spring with a force constant of 22.4 N/m. The ornament is then lowered very slowly until the spring stops stretching. How much does the spring stretch? Give answer in cmarrow_forwardIf a force F is required to extend a spring by20 cm, what force is required to extend it by30 cm? (Assume that Hooke’s Law applies.) A. FB. (2/3)FC. (3/2)FD. 600FE. (3/5)Farrow_forward
- The force required to compress a non-standard spring as a function of displacement from equilibrium x is given by the equation F(x) = ax2 - bx, where a = 55 N/m2, b = 8 N/m, and the positive x direction is in the compression direction of the spring.arrow_forwarda spring hangs from the ceiling with an unstretched length of x0 = 0.87 m. A m1 = 7.1 kg block is hung from the spring, causing the spring to stretch to a length of x1 = 1.16 m. find the length x2 of the spring when a m2 = 2.1 kg block is hung from the spring.arrow_forwardThe maximum compressional stress that a bone can withstand is 1.6 × 108 N/m2 before it breaks. Athighbone (femur), which is the largest and longest bone in the human body, has a cross sectional areaof 7.7 × 10−4 m2. What is the maximum compressional force that can be applied to the thighbone?(a) 2.1 × 1011 N, (b) 1.2 × 105 N, (c) 4.8 × 1012 N, (d) 3.0 × 103 N, (e) This cannot be determinedsince Young’s modulus is not given.arrow_forward
- A 2.35-kg uniform bar oflength l = 1.30 m is heldin a horizontal position bythree vertical springs as inFigure P8.83. The two lowersprings are compressed andexert upward forces on thebar of magnitude F1= 6.80 Nand F2 = 9.50 N, respectively.Find (a) the force Fs exertedby the top spring on the bar,and (b) the location x of the upper spring that will keep thebar in equilibrium.arrow_forwardFor elastic objects, the amount of elastic potential energy is directly proportional to the one-forth stretching of x directly proportional to the stretching x directly proportional to the square of the stretching x inversely proportional to the square of xarrow_forwardA huge pendulum consists of a 200-kg ball at the end of a cable 15 m long. If the pendulum is drawn back to an angle of 37 degrees and released, what maximum force must the cable withstand as the pendulum swings back and forth?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
Principles of Physics: A Calculus-Based Text
Physics
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Physics for Scientists and Engineers: Foundations...
Physics
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Cengage Learning
Work and Energy - Physics 101 / AP Physics 1 Review with Dianna Cowern; Author: Physics Girl;https://www.youtube.com/watch?v=rKwK06stPS8;License: Standard YouTube License, CC-BY