Homework Answers
You pull a your friend along in a sled (combined mass is 65 kg), by pulling...
You pull a your friend along in a sled (combined mass is 65 kg), by pulling the rope at an upward angle of 20 degrees with respect to the ground with enough force to keep the sled moving at a constant velocity of <3,0, 0> m/s. The coefficient of kinetic friction between the ground and the sled is 0.15. (a) Draw a force diagram for the friend/sled system. (b) Once you get to constant velocity, you pull the sled 15...
9. a. A spring has constant k-5lb./in. Its natural length is 12 inches. What is the work required to compress it to 9 inches? b. A 100 ft. cable weighs 40 lbs. Find the work done in winding the c...
9. a. A spring has constant k-5lb./in. Its natural length is 12 inches. What is the work required to compress it to 9 inches? b. A 100 ft. cable weighs 40 lbs. Find the work done in winding the cable onto a winch, if the cable is hanging vertically c. An unknown positive charge q is placed at the origin. The force F (in Newtons) with which this charge repels a unit positive charge is given by F-kq/r, where k...
answer all 5 questions 12:09 in Cap . In-call volume Question 1 20 pts A flight...
answer all 5 questions
12:09 in Cap . In-call volume Question 1 20 pts A flight attendant pulls her 2 kg flight bag a distance of 81 m along a level airport floor at a constant velocity. The force she exerts is 66 N at an angle of 60 degrees above the horizontal. Find the work she does on the flight bag. Please report the answer to the nearest whole number. Please do not include units or the answer will...
#2 show work 2. (5 points) Find a vector of length 3 that is perpendicular to...
#2 show work
2. (5 points) Find a vector of length 3 that is perpendicular to the line given by -3x + 7y = 11. Express the result in terms of the unit vectors i and j. 3. (10 points) A truck is parked on a driveway inclined 19° to the horizontal. A force of magni- tude 920 pounds is required to keep the truck from rolling down the driveway. a. Find the vector representing this force and express it...
13? Force 6 x3-2 x, find the work in mks units done by the force for...
13?
Force 6 x3-2 x, find the work in mks units done by the force for a distance of x A) 576000 J 12. in mks units done by the force for a distance of x-4 tox-6 E) 36001. B) 2000 J C) 1540 J D) 1800 J 13. An Atwood's machine with a friction less pulley has massl- 11 kg and is accelerating up at 2.7 m/s. What is the valos o mass 2? A) 1122 kg B) 89.1...
Suppose the tractor pulls horizontally on the sled instead of at an angle of 36.9. As...
Suppose the tractor pulls horizontally on the sled instead of at an angle of 36.9. As a result, the magnitude of the friction force increases to 4400N. What is the total work done on the sled? Answer: 1.20x10 J onedo 72 Work 187 SOLUTION The statement of the problem gives the hright h rather than the distance s measured along the ramp, but we can solve for h by recogsizing from the geometry in Figare 7.13 that s sinB- h....
Line Integral & Path Independency Problem 1 Prove that the vector field = (2x-3yz)i +(2-3x-2) 1-6xyzk...
Line Integral & Path Independency Problem 1 Prove that the vector field = (2x-3yz)i +(2-3x-2) 1-6xyzk is the gradient of a scalar function f(x,y,z). Hint: find the curl of F, is it a zero vector? Integrate and find f(x,y,z), called a potential, like from potential energy? Show all your work, Then, use f(x,y,z) to compute the line integral, or work of the force F: Work of F= di from A:(-1,0, 2) to B:(3,-4,0) along any curve that goes from A...
5) (10 pts) John is baby-sitting Casey, his 3-year old brother. He puts a crash helmet...
5) (10 pts) John is baby-sitting Casey, his 3-year old brother. He puts a crash helmet on Casey, places him in the red wagon and takes him on a stroll through the neighborhood. As John starts across the street, he exerts a 58 N forward force on the wagon. There is a 20 N resistance force (friction) and the wagon and Casey have a combined weight of 302 N. Construct a free body diagram showing all the forces acting upon...
9. a. A spring has constant k-5lb./in. Its natural length is 12 inches. What is the work required to compress it to 9 inches? b. A 100 ft. cable weighs 40 lbs. Find the work done in winding the cable onto a winch, if the cable is hanging vertically c. An unknown positive charge q is placed at the origin. The force F (in Newtons) with which this charge repels a unit positive charge is given by F-kq/r, where k...
answer all 5 questions
12:09 in Cap . In-call volume Question 1 20 pts A flight attendant pulls her 2 kg flight bag a distance of 81 m along a level airport floor at a constant velocity. The force she exerts is 66 N at an angle of 60 degrees above the horizontal. Find the work she does on the flight bag. Please report the answer to the nearest whole number. Please do not include units or the answer will...
#2 show work
2. (5 points) Find a vector of length 3 that is perpendicular to the line given by -3x + 7y = 11. Express the result in terms of the unit vectors i and j. 3. (10 points) A truck is parked on a driveway inclined 19° to the horizontal. A force of magni- tude 920 pounds is required to keep the truck from rolling down the driveway. a. Find the vector representing this force and express it...
13?
Force 6 x3-2 x, find the work in mks units done by the force for a distance of x A) 576000 J 12. in mks units done by the force for a distance of x-4 tox-6 E) 36001. B) 2000 J C) 1540 J D) 1800 J 13. An Atwood's machine with a friction less pulley has massl- 11 kg and is accelerating up at 2.7 m/s. What is the valos o mass 2? A) 1122 kg B) 89.1...
Suppose the tractor pulls horizontally on the sled instead of at an angle of 36.9. As a result, the magnitude of the friction force increases to 4400N. What is the total work done on the sled? Answer: 1.20x10 J onedo 72 Work 187 SOLUTION The statement of the problem gives the hright h rather than the distance s measured along the ramp, but we can solve for h by recogsizing from the geometry in Figare 7.13 that s sinB- h....
Line Integral & Path Independency Problem 1 Prove that the vector field = (2x-3yz)i +(2-3x-2) 1-6xyzk is the gradient of a scalar function f(x,y,z). Hint: find the curl of F, is it a zero vector? Integrate and find f(x,y,z), called a potential, like from potential energy? Show all your work, Then, use f(x,y,z) to compute the line integral, or work of the force F: Work of F= di from A:(-1,0, 2) to B:(3,-4,0) along any curve that goes from A...
5) (10 pts) John is baby-sitting Casey, his 3-year old brother. He puts a crash helmet on Casey, places him in the red wagon and takes him on a stroll through the neighborhood. As John starts across the street, he exerts a 58 N forward force on the wagon. There is a 20 N resistance force (friction) and the wagon and Casey have a combined weight of 302 N. Construct a free body diagram showing all the forces acting upon...
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