$\text { Find the acceleration vector in terms of } u _ { r } \text { and } u _ { \theta } \text {. }$

question 134

Multiple Choice

$\text { Find the acceleration vector in terms of } u _ { r } \text { and } u _ { \theta } \text {. }$
- $r = a ( 5 - \cos \theta ) \text { and } \frac { d \theta } { d t } = 9$

• A) \(\mathbf { a } = 25 \mathrm { a } ( \cos \theta - 9 \mathrm { a } + \mathrm { a } \cos \theta ) \mathbf { u } _ { \mathrm { r } } + ( 50 \mathrm { a } \sin \theta ) \mathbf { u } _ { \theta }\)
• B) \(\mathbf { a } = 81 \mathrm { a } ( \cos \theta - \mathrm { a } + \mathrm { a } \cos \theta ) \mathbf { u } _ { \mathrm { r } } + ( 162 \mathrm { a } \sin \theta ) \mathbf { u } _ { \theta }\)
• C) \(\mathbf { a } = 81 \mathrm { a } ( 2 \cos \theta - 5 ) \mathbf { u } _ { \mathrm { r } } + ( 162 \mathrm { a } \sin \theta ) \mathbf { u } _ { \theta }\)
• D) \(\mathbf { a } = 81 \mathrm { a } ( \cos \theta + 5 \mathrm { a } - \mathrm { a } \cos \theta ) \mathbf { u } _ { \mathrm { r } } - ( 162 \mathrm { a } \sin \theta ) \mathbf { u } _ { \theta }\)

Describe plant responses to various external stimuli through directional growth movements.

Detail the hormonal control in seed germination processes.

Examine the role of specific hormones in stem elongation, senescence, and plant growth strategies.

Understand the environmental influences on plant growth and development, including day length and temperature changes.

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