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3 years ago

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When are children MOST likely to begin using words to express meaning? A. before 12 months B. between 12 and 18 months C. betwee

n 18 months and 2 years D. between 2 and 3 years

2 answers:

lubasha [3.4K]3 years ago

7 0

Answer:

B. Between 12 and 18 months

Explanation:

I hope this helped!

disa [49]3 years ago

7 0

Answer: B. Between 12 and 18 months

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Two particles, one with charge -5.45 × 10^-6 C and one with charge 4.39 × 10^-6 C, are 0.0209 meters apart. What is the magnitud

Levart [38]

Explanation:

Given that,

Charge 1, $q_1=-5.45\times 10^{-6}\ C$

Charge 2, $q_2=4.39\times 10^{-6}\ C$

Distance between charges, r = 0.0209 m

1. The electric force is given by :

$F=k\dfrac{q_1q_2}{r^2}$

$F=9\times 10^9\times \dfrac{-5.45\times 10^{-6}\times 4.39\times 10^{-6}}{(0.0209)^2}$

F = -492.95 N

2. Distance between two identical charges, $r=0.0209\ m$

Electric force is given by :

$F=\dfrac{kq_3^2}{r^2}$

$q_3=\sqrt{\dfrac{Fr^2}{k}}$

$q_3=\sqrt{\dfrac{492.95\times (0.0209)^2}{9\times 10^9}}$

$q_3=4.89\times 10^{-6}\ C$

Hence, this is the required solution.

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3 years ago

Identify the forces acting on the cars and explain why the cars do not slide down the hill

Dvinal [7]

<span>Examples of outside forces acting on a car is gravity, wind, and other cars. Cars do not slide down hills because their weight, combined with the friction of their tires against the road, hold them in place. </span>

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3 years ago

Match each rock with the correct description.

xeze [42]

Answer:

Explanation:

1. cools quickly on the earth's surface

Extrusive igneous rock

2. cools slowly beneath the earth's surface

Intrusive igneous rock

3. formed from the remains of living organisms

Organic sedimentary rocks

4. formed from pieces of other rocks cemented together

Clastic sedimentary rock

5. formed when dissolved minerals harden

Chemical sedimentary rock

6. formed from heat and pressure

Metamorphic rocks

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3 years ago

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On a journey of 600 km, a train was delayed 1 hour and 30 min after having covered 1 4 of the way. To arrive on time at the dest

mars1129 [50]

Answer:

The train travelled 10hours.

Explanation:

Using speed= distance/time ...eq1

Let the time taken by train to cover the journey be t.

Let the speed of train be s

Time= distance/speed ...eq2

Time t =600/s ...eq3

The train is delayed for 1 1/2 hours=3/2 hours

Train increased by 15km/hr.

Train travelled 1/4 of 600k.= 150km.

Speed increased by s + 15 to cover the remaining 450km

t = 150/s + 400/(s + 15) + 3/2 ..eq4

Equating eq3 and 4

600/s= 150/s + 460/(s + 15) + 3/2

450/s = 3/2 + 450/(s + 15)

3s^2 + 45s -13500=0

Solving the quadratic equation

S= -45 +-sqrt(45^2-4(3×13500)/2×3

S= 60 , -75

Hence speed of train is 60km/hr

Using eq 2 distance/speed=time

600/60=10

t= 10hours

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3 years ago

A simple wheel and axle is used to lift a bucket of water out of a well. the radii of the wheel and axle are 20cm and 4cm, respe

Veronika [31]

Answer: i think it is A

Explanation: hope it helped

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3 years ago

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