21 b) c) All questions in 18-23 are of equal value: 2 point for a correct ans po

Question

21 b) c)
All questions in 18-23 are of equal value: 2 point for a correct ans point fo correct answer; 0 points for no answer. Give your answers with as many significar reasonable. Newtons? 18. A force has a magnitude of 7.5 J/m. What is its magnitude in units of 19. A force of 10 Jlm is applied to an object in the direction of motion to move distance of 3.5 m. How much work is done on the object by the force that moves 20. A constant force is applied in the direction of motion to move the object a dis The energy transferred form the force to the object is 30 Nm. of J/m and in What is the magnitude of the force applied to the object (in units 21. Forces F and F are given by (4 N 7 N 3 N and (2 N 4 N 9 N respectively a) Give F and F, in notation with unit vectors. (b) What is the magnitude of the force F F F (c) What is the magnitude of the force F F F even thou (6,9,1) and F2 (3,-1 22. What is the angle (in its of radians) between Fi N 23. an energy be stored in, or removed from, a force field?

Explanation / Answer

The only force fields we have now are magnetic fields, and energy can't really be stored in them...energy has to power them to keep them active.

Do a google search for that scientist who levitated a frog which was injected with a bunch of water with a magnetic field, cool stuff.

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