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3 years ago

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A car begins at rest at a stoplight. After the light turn green, the car begins to accelerate 5 m/s2 over the span of 3.6 second

s. What is the car’s displacement over this period of time?
Hint you can use this equation Xf = Xi + vi · t + 1/2 · a · t2

1 answer:

trasher [3.6K]3 years ago

5 0

Answer:

d=9m

Explanation:

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Control rods are used to slow down the reaction in the reactor core when the core becomes too hot. Please select the best answer

viktelen [127]

The best answer is true. Yes, control rods are used to slow down the reaction in the reactor core when the core becomes too hot.

<h3>What is a nuclear reactor?</h3>

A nuclear reactor, often known as an atomic pile, is a device that initiates and controls nuclear chain reactions or nuclear fusion processes.

Nuclear reactors are used in nuclear power plants to generate energy as well as in nuclear marine propulsion.

Control rods are employed in nuclear reactors because the processes that occur in a nuclear reactor are very exothermic.

As a result, when these control rods are infused into a nuclear reactor, they absorb neutrons and aid in the management of the chain reaction. As a result, the rate of the chain reaction is brought under control.

As a result, we may infer that the statement control rods are employed to slow down the reaction in the reactor core when it gets too hot is correct.

Hence the best answer is true. Yes, control rods are used to slow down the reaction in the reactor core when the core becomes too hot.

To learn more about the nuclear reactor refer to the link;

brainly.com/question/896706

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2 years ago

Suppose a dolphin sends out a series of clicks that are reflected back from the bottom of the ocean 80 m below. How much time el

umka2103 [35]

Answer:

Time, t = 0.104 seconds

Explanation:

Frequency of the click of the Dolphin, f = 55.3 kHz

A dolphin sends out a series of clicks that are reflected back from the bottom of the ocean 80 m below, d = 80 m

The speed of sound in seawater is, v = 1530 m/s

Once the sound is send and reflects, the total distance covered by it is 2d such that,

$t=\dfrac{2d}{v}\\\\t=\dfrac{2\times 80}{1530}\\\\t=0.104\ s$

So, the time elapses before the dolphin hears the echoes of the clicks is 0.104 seconds.

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3 years ago

A person with a near point of 85 cm, but excellent distant vision, normally wears corrective glasses. But he loses them while tr

svp [43]

Answer:

a) p = 95.66 cm, b) p = 93.13 cm

Explanation:

For this problem we use the constructor equation

$\frac{1}{f} = \frac{1}{p} + \frac{1}{q}$

where f is the focal length, p and q are the distances to the object and the image, respectively

the power of the lens is

P = 1 / f

f = 1 / P

f = 1 / 2.25

f = 0.4444 m

the distance to the object is

$\frac{1}{p} = \frac{1}{f} -\frac{1}{q}$

the distance to the image is

q = 85 -2

q = 83 cm

we must have all the magnitudes in the same units

f = 0.4444 m = 44.44 cm

we calculate

$\frac{1}{p} = \frac{1}{44.44} - \frac{1}{83}$

1 / p = 0.010454

p = 95.66 cm

b) if they were contact lenses

q = 85 cm

$\frac{1}{p} = \frac{1}{44.44} - \frac{1}{85}$

1 / p = 0.107375

p = 93.13 cm

7 0

3 years ago

A stone is thrown horizontally at 15 m/s from the top of a cliff 40 meters high. How far from the base does the stone hit the gr

Reil [10]

Answer:

She stone hit ground 42.86 m far from base of cliff.

Explanation:

Initial height from ground = 40 meter.

We have equation of motion , $s= ut+\frac{1}{2} at^2$ , s is the displacement, u is the initial velocity, a is the acceleration and t is the time.

In this the velocity of body in vertical direction = 0 m/s, acceleration = 9.8 $m/s^2$ , we need to calculate time when s = 40 meter.

Substituting

$40=0*t+\frac{1}{2} *9.8*t^2\\ \\ t = 2.86 seconds$

So it will take 2.86 seconds to reach ground.

So, stone travels horizontally at 15 m/s for 2.86 seconds.

Distance travelled = 15 x 2.86 = 42.86 m

So, the stone hit ground 42.86 m far from base of cliff.

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3 years ago

8. Which explains how a plane mirror works?

lesya692 [45]

Answer:

light rays reflect off an object ,strike the mirror ,and are reflected into your eyes

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3 years ago