Question

6. A woman takes her dog Rover for a walk on a leash. To get the little poco moving forward, she pulls on the leash with a force of 20.0 N at an angle of 37 degrees above the horizonta. How much force is tending to lift Rover off the ground?

16.0 N

12.0 N

20.0 N

42.1 N


10. Vector A has a magnitude of 12.6 m and a direction of -84.0 degrees. Vector B ha a a magnitude of 34.0 m and a direction of -75.0 degrees. What is the resultant magnitude and direction of a vector that is equal to A+B?

Magnitude 20.6 m Direction -71.1 degrees

Magnitude 46.4 m Direction -77 degrees

Magnitude 20.6 m Direction -78.2 degrees

Magnitude 46.4 m Direction 102 degrees

Answer 1

20 *sin 37
is a little more than 20 sin 30 which would be 10

Answer 2

Ax = 12.6 cos 84
Ay = -12.6 sin 84

Bx = 34 cos 75
By = -34 sin 75

Rx = Ax+Bx
Ry = Ay+By
R = sqrt (Rx^2+Ry^2)
angle = tan^-1 (Ry/Rx)
HOWEVER USE HEAD instead
both are almost in the same direction
so
magnitude is a little less than 12.6+34
and direction is between - 75 and -84
SO
around 47 at angle about -80
only one answer is close :)

Answer 3

So is 6, 12.0 N and 10. 46.4 and -77 degrees?

Answer 4

yes, yes