For Problems 2 to 6, given A = i+j- 2k, B = 2i – j+ 3k, C = j– 5k: Find the work done by the force B acting on an object which undergoes the dis- placement C. 2. Find the total work done by forces A and B if the object undergoes the displacement C. Hint: Can you add the two forces first? 3. Let O be the tail of B and let A be a force acting at the head of B. Find the torque of A about O; about a line through O perpendicular to the plane of A and B; about 4.

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For Problems 2 to 6, given A =i+j- 2k, B = 2i – j+ 3k, C =j- 5k:
Find the work done by the force B acting on an object which undergoes the dis-
placement C.
2.
Find the total work done by forces A and B if the object undergoes the displacement
C. Hint: Can you add the two forces first?
3.
Let O be the tail of B and let A be a force acting at the head of B. Find the torque
of A about O; about a line through O perpendicular to the plane of A and B; about
a line through O parallel to C.
4.
Let A and C be drawn from a common origin and let C rotate about A with an
angular velocity of 2 rad/sec. Find the velocity of the head of C.
5.
In Problem 5, draw B with its tail at the head of A. If the figure is rotating as in
Problem 5, find the velocity of the head of B. With the same diagram, let B be a
force; find the torque of B about the head of C, and about the line C.
6.
7.
A force F = 2i – 3j + k acts at the point (1,5, 2). Find the torque due to F
(a)
about the origin%3;
(b)
about the y axis;
(c)
about the line /2 = y/1 = z/(-2).
A vector force with components (1, 2, 3) acts at the point (3, 2, 1). Find the vector
torque about the origin due to this force and find the torque about each of the
coordinate axes.
8.
The force F = 2i – j – 5k acts at the point (-5, 2, 1). Find the torque due to F
about the origin and about the line 2x = -4y = -z.
9.
Transcribed Image Text:For Problems 2 to 6, given A =i+j- 2k, B = 2i – j+ 3k, C =j- 5k: Find the work done by the force B acting on an object which undergoes the dis- placement C. 2. Find the total work done by forces A and B if the object undergoes the displacement C. Hint: Can you add the two forces first? 3. Let O be the tail of B and let A be a force acting at the head of B. Find the torque of A about O; about a line through O perpendicular to the plane of A and B; about a line through O parallel to C. 4. Let A and C be drawn from a common origin and let C rotate about A with an angular velocity of 2 rad/sec. Find the velocity of the head of C. 5. In Problem 5, draw B with its tail at the head of A. If the figure is rotating as in Problem 5, find the velocity of the head of B. With the same diagram, let B be a force; find the torque of B about the head of C, and about the line C. 6. 7. A force F = 2i – 3j + k acts at the point (1,5, 2). Find the torque due to F (a) about the origin%3; (b) about the y axis; (c) about the line /2 = y/1 = z/(-2). A vector force with components (1, 2, 3) acts at the point (3, 2, 1). Find the vector torque about the origin due to this force and find the torque about each of the coordinate axes. 8. The force F = 2i – j – 5k acts at the point (-5, 2, 1). Find the torque due to F about the origin and about the line 2x = -4y = -z. 9.
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