Which of the following instrument can be used for measuring speed of an aeroplane

A. 22.5 m/sec. B. 33 m/sec. C. 40 m/sec. D. 90 m/sec.

A. the weight of the body B. more than the weight of the body C. less than the weight of the body D. weight of the fluid displaced by the body

A. $${\text{p}} = {\text{T}} \times {\text{r}}$$ B. $${\text{p}} = \frac{{\text{T}}}{{\text{r}}}$$ C. $${\text{p}} = \frac{{\text{T}}}{{2{\text{r}}}}$$ D. $${\text{p}} = \frac{{2{\text{T}}}}{{\text{r}}}$$

A. cannot be subjected to shear forces B. always expands until it fills any container C. has the same shear stress.at a point regardless of its motion D. cannot remain at rest under action of any shear force