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4 years ago

A car, moving along a straight stretch of highway,

1 answer:

5 0

<span>We know that an object in moving with acceleration follow the rule according that the distance covered will be : d = Vi*t + 1/2*a*t^2 where d is distance, Vi is initial speed, and a is acceleration Then after 1 km which is 1000 metres we have: 1000 = Vi *71.2 + 1/2*0.0499*(71.2)^2 Vi = (1000-1/2*0.0499*(71.2)^2)/71.2 = 1000/71.2 - 1/2*0.0499*71.2 = 12.27 m/s Then the car was going at 12.27 m/s when started to accelerate.</span>

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Large radio telescopes, like the one in Arecibo, Puerto Rico, can detect extremely weak signals. Suppose one radio telescope is

ad-work [718]

Answer:

Explanation:

Oh sorry I thought I knew this one I guess not but you can prob look it up on safari

4 0

3 years ago

Which metals have similar chemical properties? Check all that apply.

Alika [10]

Answer:

yes

Explanation:

3 0

3 years ago

Read 2 more answers

3.12 ** To illustrate the use of a multistage rocket consider the following: (a) A certain rocket carries 60% of its initial mas

madreJ [45]

Answer:

$0.916v_{ex}$

Explanation:

A multistage rock is also known as a step rocket and it is a form of vehicle that can use more than a rocket stage. The rocket stage typically contains propellant as well as its engine. The final speed of the rocket can be estimated using the equation below:

$v = v_{ex} ln(\frac{m_{o}}{0.4m_{o}})$ $= v_{ex}*ln(2.5) = v_{ex}*0.916 = 0.916v_{ex}$

Therefore, the maximum speed of the rocket is $0.916v_{ex}$

8 0

4 years ago

Mass of a body is 210g and its density is 7.981g/cm^3 what will be its volume with regard to significant figures

aleksandrvk [35]

Density is mass per unit volume,

$\rho=\dfrac mV$

so to get the volume, divide the mass by the density,

$V=\dfrac m\rho$

So the volume is

$\dfrac{210\,\mathrm g}{7.981\frac{\rm g}{\mathrm{cm}^3}}\approx26.312\,\mathrm{cm}^3\approx\boxed{26\,\mathrm{cm}^3}$

3 0

3 years ago

hot water is added to three times its mass of water at 10 degree celsius and the resulting temperature is 20 degrees Celsius Wha

olchik [2.2K]

Answer:

The initial temperature of the hot water is $50\; \rm ^{\circ} C$ (assuming that no heat was lost to the surroundings.)

Explanation:

Let $m$ denote the mass of the hot water.

The question states that the mass of the water at $10\; \rm ^\circ C$ is three times the mass of the hot water. If the mass of the hot water is $m$ , the mass of the cold water would be $3\, m$ .

Let $c$ denote the specific heat capacity of water. Let $m$ denote the mass of some water. The energy required to change the temperature of that much water by $\Delta T$ (without state change) would be: