Saturday

April 19, 2014

April 19, 2014

Posted by **Lindsay** on Saturday, December 24, 2011 at 7:18pm.

a. a net force to the object.

b. a net torque to the object.

c. a centripetal acceleration to the object.

d. both a net force and a net torque to the object.

We have three vectors, labeled A, B, and C. A points due west, B points due north, and C points due east. We don’t know their relative magnitudes. We find the cross product of each of these vectors with a vector which points due south (D). Rank the three cross products ( ) from smallest to largest in terms of their vertical component, taking the sign of the component into account.

g. You cannot tell with the given information

- physics -
**Damon**, Saturday, December 24, 2011 at 7:19pmTo change angular momentum requires a moment(torque)

- physics -
**Damon**, Saturday, December 24, 2011 at 7:32pmLOL, yes you can tell

first B X D

the angle between B and D is 180, and the sine of 180 is zero

therefore B X D = 0

that was easy

Now A X D

rotation from A to D is + 90 degrees, so A X D is UP, positive

But C X D

rotation from C to D is negative 90 degrees, cross product down

C X D is DOWN, negative

Thus

in order

CXD negative

BXD zero

AXD positive

**Related Questions**

Physics - Angular Momentum - When the angular momentum changes, the 'change' in ...

Physics-Change in Angular Momentum - What is the change in angular momentum of a...

Physics - A skater spinning with angular speed of 1.5 rad/s draws in her ...

PHYSICS ---HELP! - Consider a hoola-hoop of radius R and it is spinning about ...

physics - Consider a hoola-hoop of radius R and it is spinning about its ...

physics - A small stone of mass m is stuck on the periphery of a wheel of radius...

physics - A skater spinning with angular speed of 1.5 rad/s draws in her ...

physics - What is the angular momentum (in kilogram-meter^2/second) of a 300.0 g...

Physics - There is a net net torque that is applied to a rigid object. What ...

Science - A spinning star begins to collapse under its own gravitational pull. ...