Week 1 Homework
Assigned Readings: please see the syllabus for full details
| Homework Problems | Approximate Answer | Student Responsible for Posting Solution |
|---|---|---|
| 40, page 33 | (a) 50 N, (b) 10 N | Sarah Elizabeth Bailey |
| 45, page 33 | (a) 0 N, (b) 120 N, (c) 0 N | Ashlyn Baker |
| 72, page 35 | (a) on Earth, weight = 98.0 N (b) on Moon, weight = 16.3 N (c) mass same on both |
Nelson David |
| 77, page 35 | Yes | Yvonne Jean Dvorak |
| 92, page 35 | - | James W Fiorilli |
| 36, page 32 | a = 5.0 m/s^2 | Angelia Flowers |
Week 2 Homework
Assigned Readings: please see the syllabus for full details
| Homework Problems | Approximate Answer | Student Responsible for Posting Solution |
|---|---|---|
| 41, page 56 | a = 4.0 m/s^2 | Nathan Foster |
| 44, page 56 | F = 200,000 N | Debra Renee Freeman |
| 50, page 56 | (a) F = 40 N (b) a = 0.5 m/s^2 |
Melanie Leigh Goss |
| 52, page 56 | If you use g = 9.8 m/s^2 then friction force is 464 N |
Dr. Bob |
| 66, page 115 | weight on other planet is 1/4 the weight on Earth | Laura Ann Hubbard |
| 46, page 113 | force of attraction is 25 times more | Brian Westley Johnson |
| What is the gravitational force of attraction between a 150,000,000 kg block of granite and a 200,000,000 kg rock if they are 18.0 meters apart? | F = 6176 N | Dr. Bob |
The top speed of a car is limited by air resistance. When the force of air resistance equals the force delivered by the car, acceleration is zero and it moves at a constant velocity. The force of air resistance can be given by F = D v2, where D is a drag-factor and v is the velocity of the car. What is the top speed of a sports car if it can deliver a maximum force of 5502 N against air resistance and its Drag factor is 0.6792 kg/m ? |
top speed is 90.0 m/s | Dr. Bob |
Week 3 Homework
Assigned Readings: please see the syllabus for full details
| Homework Problems | Approximate Answer | Student Responsible for Posting Solution |
|---|---|---|
| 54, page 84 | (a) 4.5 N • s (b) 225 N |
Ahmad Sirry Kendawi |
| 55, page 84 | 0.82 m/s | Brent Joseph Knickerbocker |
| 58, page 84 | KE = 6000 J | Gaben Marcus Laird |
| Extra Stuff for #58, page 84 Part 1: determine the velocity when KE = 8000 J. Assume Bernie's mass is is 80 kg |
When KE = 8000 J v = 14.1 m/s |
Marcus Vincent Liberto |
| Extra Stuff for #58, page 84 Part 2: determine the height when KE = 8000 J. Assume Bernie's mass is is 80 kg |
When KE = 8000 J h = 2.55 m |
Fawn Marie Lipe |
| 64, page 85 Hint: find work first |
Work = 705.6 J Power = 470.4 W Note: I used g = 9.8 m/s2 |
Arthur Edmund Maison |
| 52, page 141 Hint: find density in g/cm3 and kg/m3 |
6 g/cm3 or 6000 kg/m3 |
Allen Marin |
| 56, page 141 Hint: convert mass into grams |
51.8 cm3 | Adrian Lavar Mcdaniel |
Week 4 Homework
Assigned Readings: please see the syllabus for full details
| Homework Problems | Approximate Answer | Student Responsible for Posting Solution |
|---|---|---|
| 33, page 160 Note: there is a typo in the book, the temps should be 20° C and 30° C |
300 cal | John Raymond Mowatt |
| 34, page 160 | 1257 J | none |
| 39, page 160 | 450,000 J for steel 4,190,000 J for water |
Thomas Joseph Quinn |
| 49, page 183 | (a) 317 cal (I get 316.5 cal) (b) 540 cal |
Robert John Reynolds |
| 55, page 183 | 10,000 grams or 10 kg | Jonathan Sung Won Ryu |
Week 5 Homework
Assigned Readings: please see the syllabus for full details
| Homework Problems | Approximate Answer | Student Responsible for Posting Solution |
|---|---|---|
| 46, page 450 | see practice book | Jon M Stanley |
| 32, page 449 | 1.0 x 1022 atoms (see example on pages 434-435) |
Ngoc Anh Tran |
| 35, page 449 | 3 moles of O2 | Sheqoria Nicquel Williams |
| 38, page 450 | 1.8 grams water and 4.2 grams propene |
Dr. Bob |
| 52, page 485 | see practice book | Sarah Elizabeth Bailey |
| 38, page 485 | [OH-] = 1.0 x 10-4 M | Ashlyn Baker |
| 39, page 485 | (a) pH = 10.00, base (b) pH = 4.00, acid |
Nelson David |
Week 6 Homework
Assigned Readings: please see the syllabus for full details
| Homework Problems | Approximate Answer | Student Responsible for Posting Solution |
|---|---|---|
| 41, page 210 | 10 N | Yvonne Jean Dvorak |
| 51, page 211 | R = 6 ohms | James W Fiorilli |
| 37, page 233 | 25 turns | Angelia Flowers |
| 42, page 233 | (a) 60 V (b) 6 A (c) 360 W |
Nathan Foster |
Week 7 Homework
Assigned Readings: please see the syllabus for full details
| Homework Problems | Approximate Answer | Student Responsible for Posting Solution |
|---|---|---|
| 44, page 259 | (a) 0.83 s (b) 1.2 Hz |
Debra Renee Freeman |
| 50, page 259 | 0.10 m or 10 cm | Melanie Leigh Goss |
| 38, page 289 | 561 m | Laura Ann Hubbard |
| 43, page 289 | (a) 5 x 10-7m (b) 5000 times larger |
Brian Westley Johnson |
| 43, page 345 | (a) At-218, (b) Pb-214 | Ahmad Sirry Kendawi |
| The isotope cesium-137 has a half-life of 30 years. It is a by product of of nuclear power plants. How long will it take this isotope to decay to 1/16 of its original amount? | 120 years | Brent Joseph Knickerbocker |
| A certain radioactive substance has a half-life of 1 hour. If you start with a 1024 g sample at noon, how much is left at 3:00 PM? At 6:00 PM? At 10:00 PM? | (a) 128 g (b) 16 g (c) 1 g |
Gaben Marcus Laird |