The tension in the cable in Fig 4 below is

In the figure, a block of mass M hangs at rest. The rope that is fastened to the wall is horizontal and has a tension of 52 N. The rope that is fastened to the ceiling has a tension of 91 N, and makes an angle θ with the ceiling. What is the angle θ?

The x-component of Vector B in Fig 2 below is

The graphical method of vector addition is more accurate than    mathematical methods          

Birds are different from all other living vertebrates because they 

Eutherian mammals are uniquely defined by 

Which is an incorrect match of taxonomic category and common name? 

Hagfish have a notochord with a well-developed set of bony vertebrae.

Which fish were thought to be extinct, but were actually found in living populations? 

Metamorphosis is