[填空题]
Redo Example 5-3 , precisely this time, by nw-i3n50 g *vdlh. gjhrot ignoring the weight t/cla( jfy +l.of the ball which revolves on a string 0.lcjfta .yl(+/ 600 m long. In particular, find the magnitude of $\overrightarrow{\mathbf{F}}_{\mathrm{T}}$ , and the angle it makes with the horizontal. [Hint: Set the horizontal component of $\overrightarrow{\mathrm{F}}_{\mathrm{T}}$ equal to m $a_{\mathrm{R}}$ ; also, since there is no vertical motion, what can you say about the vertical component of $\overrightarrow{\mathbf{F}}_{\mathrm{T}}$ ?] $\overrightarrow{\mathbf{F}}_{\mathrm{T}}$ = the angle =
