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GrogVix [38]
4 years ago
6

What is the shortest possible time in which a bacterium could travel a distance of 8.4 cm across a petri dish at a constant spee

d of 3.5 mm/s?
Physics
1 answer:
Dahasolnce [82]4 years ago
7 0

speed of the bacterium is 3.5 mm/s

v = 3.5 mm/s

total distance traveled by bacterium = 8.4 cm

d = 8.4 cm = 84 mm

time take to cover the distance

t = \frac{d}{v}

t = \frac{84}{3.5} = 24 s

<em>so it will take 24 s to move this distance</em>

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A speeding motorist traveling with velocity Vm is spotted by a police car. The police car is initially at rest, but the instant
Svetlanka [38]

Answer:

Explanation:

Given

Let us suppose police car and motorist travel in straight line  and police car catches motorist after s distance

Distance travel by motorist

s=v_mt----1

Distance traveled by Police car

s=ut+\frac{at^2}{2}

s=0+\frac{a_pt^2}{2}

s=\frac{a_pt^2}{2}----2

from 1 & 2 we get

t=\frac{2v_m}{a_p}

(a)Velocity of Police car after t sec

v=u+a_pt

v=0+a_p\times \frac{2v_m}{a_p}

v=2v_m

(b)time taken by police car is

t=\frac{2v_m}{a_p}

(c)Distance travel by police car=\frac{2v_m^2}{a_p}

7 0
3 years ago
The free-body diagram below represents the force of several vehicles driving across a bridge. Assume that the bridge is in stati
krek1111 [17]

In order to calculate the unknown reaction force, we need to know that the sum of forces pointing down is equal the sum of the forces pointing up, so all forces will be in equilibrium.

So we have:

\begin{gathered} 17800+150000+13200=121000+x \\ 181000=121000+x \\ x=181000-121000 \\ x=60000 \end{gathered}

7 0
1 year ago
Which type of force is used by your legs to pedal a bicycle?
Kay [80]
The answer is strong push. When you ride a bike, the pedals convert a vertical push from your legs into rotational motion for the wheels to turn.
8 0
3 years ago
A series RLC circuit has a resistance of 57.61 W, a capacitance of 13.13 mF, and an inductance of 196.03 mH. The circuit is conn
Firdavs [7]

Answer:

voltage across = 1.6 V

Explanation:

given data

resistance R = 57.61 Ω

capacitance c = 13.13 mF = 13.13 ×10^{-3} F

inductance L = 196.03 mH = 0.19603 H

fixed rms output Vrms = 23.86 V

to find out

voltage across circuit

solution

we know resonant frequency that is

resonant frequency = 1 / ( 2π√(LC)

put the value

resonant frequency = 1 / ( 2π√(0.19603×13.13 ×10^{-3})

resonant frequency f = 3.1370 HZ

so current will be at this resonant is

current = Vrms / R

current =  23.86 / 57.61

current = 0.4141 A

and

so voltage across will be

voltage across = current / ( 2π f C )

voltage across = 0.4141 / ( 2π ( 3.1370) 13.13 ×10^{-3} )

voltage across = 1.6 V

4 0
3 years ago
A wave has a distance between its peaks of 0.4 meters at a speed of 10 meters per second. What is the wave's frequency, in hertz
REY [17]

Answer: 25Hz

Explanation:

Given that:

Wavelength (λ) = 0.4m (the distance between the peaks of a wave is known as wavelength)

Frequency F = ?

Speed of wave V = 10 m/s

The wave frequency is the number of cycles which the wave complete in one second. It is measured in hertz, and represented by the symbol F

So, apply the formula V = F λ

10m/s = F x 0.4m

F = 10m/s / 0.4m

F = 25Hz

Thus, the frequency of the wave is 25 Hertz.

8 0
4 years ago
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