Physics

A flea pulls on a puck with force 7 microN at an angle of 30°. Another flea pulls on the puck with force 2 microN at an angle of -60°.

a) What is the magnitude of the net force on the puck? (I got 7.28 uN)

b)At what angle is the net force? ( I got about 14.07 deg)

c) A third flea decides to pull the puck so that it will stop accelerating. What is the magnitude of the force with which it must pull, and in what direction must the flea pull so that the puck stops accelerating?

This is the one I need help with. Is it similar to part a?

1. 👍 0
2. 👎 0
3. 👁 193
1. a) sqrt(2^2+7^2) = sqrt(53) = 7.28 check

b)tan^-1 (2/7) = 15.9 and 30-15.9 = 14.1 check

c) you need the third flea to cancel the RESULTANT of a and b
He must pull at 7.28 *10^-6 N opposite to part b which is 14.1 + 180 = 194 degree(or 14.1 - 180)

1. 👍 0
2. 👎 0
posted by Damon
2. It depends on how the angle is measured. If the angle is measured from some arbritary axis, and the fleas are on the oppsite sides of this axis, then you have a ninety degree angle between the force vectors
You are correct on a, b. On C, the equilibrant force is equal and opposite to a.
I see it as 7.28uN at the angle opposite b.

1. 👍 0
2. 👎 0
3. Ah, good, I am taking a break :)

1. 👍 0
2. 👎 0
posted by Damon

Similar Questions

1. physics

A flea pulls on a puck with force 8 microN at an angle of 75°. Another flea pulls on the puck with force 2 microN at an angle of -45°. (See diagram for angle scale.) Draw vectors on the diagram to scale representing the forces.

asked by jon smith on May 19, 2010
2. Physics

High-speed motion pictures (3500frames/second) of a jumping 280ìg flea yielded the data to plot the flea's acceleration as a function of time as shown in the figure (Figure 1). This flea was about 2 mm long and jumped at a nearly

asked by Jordan on October 10, 2013
3. Physics

Starting from rest, a 2.4x10-4 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.42 N on it. This force does 1.5x10-4 J of work on the flea. (a) What is

asked by Kate on August 27, 2015
4. physics

Starting from rest, a 2.4x10-4 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.42 N on it. This force does 1.5x10-4 J of work on the flea. (a) What is

asked by archer on August 28, 2015
5. physics

Starting from rest, a 2.1x10-4 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.37 N on it. This force does 1.5x10-4 J of work on the flea. (a) What is

asked by Anonymous on March 11, 2014
6. Physics

Starting from rest, a 1.7x10-4 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.44 N on it. This force does 2.4x10-4 J of work on the flea. (a) What is

asked by Hannah on September 21, 2011
7. Physics

Starting from rest, a 1.7x10-4 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.45 N on it. This force does 1.9x10-4 J of work on the flea. (a) What is

asked by BrookeNeed on October 14, 2016
8. Physics

Starting from rest, a 2.3x10-4 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.44 N on it. This force does 2.7x10-4 J of work on the flea. (a) What is

asked by Sidiqa on March 5, 2018
9. Phys

Starting from rest, a 1.6x10-4 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.38 N on it. This force does 2.6x10-4 J of work on the flea. (a) What is

asked by justin on July 3, 2013
10. Physics

Starting from rest, a 1.6x10-4 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.42 N on it. This force does 3.6x10-4 J of work on the flea. (a) What is

asked by April on March 12, 2012

More Similar Questions