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tester [92]
3 years ago
9

A 48.9 kg meteor is moving in outer space. If a 8.6 N force is applied opposite the direction of motion, what is the deceleratio

n (in outer space we assume no friction)
Physics
1 answer:
nalin [4]3 years ago
3 0

Answer:

The deceleration is 0.18 m/s²

Explanation:

Hi there!

Using Newton´s second law, we can calculate the deceleration:

∑F = m · a

Where:

∑F = the sum of all forces in a given direction.

m = mass of the object.

a = acceleration.

Solving for a:

∑F/m = a

The only force acting on the meteor is the applied force of 8.6 N. So, the acceleration will be:

8.6 N / 48.9 kg = a

a = 0.18 m/s²

The deceleration is 0.18 m/s² or, in other words, the acceleration is -0.18 m/s²

Have a nice day!

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4.72 A full-wave bridge-rectifier circuit with a 1-k load operates from a 120-V (rms) 60-Hz household supply through a 12-to-1 s
melisa1 [442]

Answer:

a) 12.74 V

b) Two pairs of diode will work only half of the cycle

c) 8.11 V

d) 8.11 mA

Explanation:

The voltage after the transformer is relationated with the transformer relationshinp:

V_o=Vrms*\frac{1}{12}\\V_o=10Vrms

the peak voltage before the bridge rectifier is given by:

V_{op}=Vo*\sqrt{2}\\V_{op}=14.14V

The diodes drop 0.7v, when we use a bridge rectifier only two diodes are working when the signal is positive and the other two when it's negative, so the peak voltage of the load is:

V_l=V_{op}-2(0.7)\\V_l=12.74V

As we said before only two diodes will work at a time, because the signal is half positive and half negative,so two of them will work only half of the cycle.

The averague voltage on a full wave rectifier is given by:

V_{avg}=2*\frac{V_l}{\pi}\\V_{avg}=8.11V

Using Ohm's law:

I_{avg}=\frac{V_{avg}}{R}\\\\I_{avg}=8.11mA

7 0
3 years ago
A train A travelled a distance of 150 km in 3 hours, whereas, train 'B"
ozzi

Answer:

Therefore, Train A is faster with 50km/h and a 5km/h difference

Explanation:

train A

150km/3h = 50km/h

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8 0
3 years ago
A parallel plate capacitor is constructed with a dielectric slab with κ = 1.5 inserted between the plates. The area of each plat
maksim [4K]

Answer:

The value is V =  4.533  \  V

Explanation:

From the question we are told that

The dielectric constant is k = 1.5

The area of each plate is A =  5 \ cm^2 = 0.0005 m^2

The distance between the plates is d= 1 \  mm  =  0.001 \  m

The charge on the capacitor is Q =  6*10^{-11} \  C

Generally the electric field in a vacuum is mathematically represented as

E_o  =  \frac{V_o}{d}

Generally V_o is the voltage of the capacitor which is mathematically represented as

V_o =  \frac{Q}{C_o}

Here C_o is the capacitance of the capacitor in a vacuum which is mathematically represented as

C_o =  \frac{\epsilon_o * A}{d}

Here epsilon_o is a constant with value epsilon_o= 8.85*10^{-12} C^2 \cdot N^{-1} \cdot m^{-2}

=> C_o =  \frac{8.85*10^{-12} * 0.0005 }{0.001}

=> C_o =  4.425 *10^{-12}  \  F

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V_o =  \frac{6*10^{-11} }{  4.425 *10^{-12}}

V_o =  13.6 \  V

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E_o  =  \frac{ 13.6}{0.001}

=> E_o  = 13600 \ V/m

The electric field when the dielectric slab is inserted is mathematically represented as

E =  \frac{E_o}{k}

=> E =  \frac{13600}{1.5}

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E_{N} =  E_o - E

=> E_{N} =  13600- 9067

=> E_{N} = 4533 \  V/m

Generally the potential difference between the plates is

V =  4533   *  0.001

=> V =  4.533  \  V

6 0
4 years ago
judith weighs twice as much as Kristina.judith can run up a flight of stairs in 5 seconds while Kristina requires 10 seconds.com
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Answer:

judith has power while

krsistina don't

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7 0
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