Physics, 01.07.2019 01:00 live4dramaoy0yf9

The flowers of the bunchberry plant open with astonishing force and speed, causing the pollen grains to be ejected out of the flower in a mere 0.30 ms at an acceleration of 2.5×104m/s2. part a with what speed are pollen grains ejected from a bunchberry flower? express your answer using two significant figures. is the bee likely to notice?

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Answer from: bbrid8590

As we know that pollens are ejected out from rest

So its initial speed is

v_i = 0

acceleration of the pollen that comes out is

$a = 2.5 \times 10^4 m/s^2$

now it took time

t = 0.30 ms

so we will use kinematics to find out the speed with which it will ejected out

v_f = v_i + at

$v_f = 0 + (2.5 \times 10^4)(0.30 \times 10^{-3})$

v_f = 7.5 m/s

so final speed will be 7.5 m/s

Answer from: kenny909

Pollen grains speed : 7.5 m/s

Further explanation

Linear motion consists of 2: constant velocity motion with constant velocity and uniformly accelerated motion with constant acceleration

• An equation of uniformly accelerated motion

$\large {\boxed {\bold {x=xo+vo.t+\frac {1} {2} at ^ 2}}}$

V = vo + at Vt² = vo² + 2a (x-xo)

x = distance on t

vo / vi = initial speed

vt / vf = speed on t / final speed

a = acceleration

Acceleration is a change in speed within a certain time interval

a = Δv / Δ t

$\displaystyle a = \frac {v2-v1} {t2-t1}$

The velocity graph with respect to time (v-t) in this motion will be in the form of sloping straight lines with a gradient of tan θ = a

For acceleration that is positive (a> 0) is called accelerated motion, the graph is sloping upward, while for acceleration that is negative (a <0) is called slowed down motion, the graph is sloping downward

The pollen grains to be ejected out of the flower in 0.30 ms at an acceleration of 2.5×10⁴m/s², then :

Δt = 0.3 ms = 3.10⁻⁴ s

a = 2.5 × 10⁴ m/s²

so :

$\rm \Delta v=a\times \Delta t\\\\\Delta v=2.5\times 10^4\times 3\times 10^{-4}\\\\\Delta v=7.5\\\\\Delta v=vf-vi(vi=0),vf=\boxed{\bold{7.5\:m/s}}$

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Answer from: Quest

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm. the wire diameter is d = 0.9 mm. the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

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explanation:

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