Abody is under the action of two forces 7n and 10n. find the resultant of the two forces if: 1.) the forces are parallel and act in the same direction 2.) the forces are parallel and act in opposite directions. 3.) the forces are inclined at an angle of 60° to each other. 4.) the forces are inclined at an angle of 160°. 5.) the forces act at 90° to each other.

1) 17 N

2) -3 N

3) 14.80 N

4) 4.18 N

5) 12.21 N

Explanation:

  The resultant (R) of two forces P and Q acting at an angle θ is given by

 We have P = 7N  and Q =10N

 1) The forces are parallel and act in the same direction ( θ = 0° )

2) The forces are parallel and act in opposite directions( θ = 180° )

3) The forces are inclined at an angle of 60° to each other( θ = 60° )

4) The forces are inclined at an angle of 160°( θ = 160° )

5) The forces act at 90° to each other( θ = 90° )

e) none of the above answers are correct

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27