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3 years ago

A jogger travels 8.0 km in 1.25 hours.what is the jogger's average speed

1 answer:

4 0

<span> a jogger travels 8.0 km in 1.25 hours. What is the jogger's average speed
the answer is </span><span> 4 mph.</span>

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The gravitational force,F, on a rocket at a distance,r, from the center of the earth isgiven byF=kr2wherek= 1013N·km2. (Newton·k

Brrunno [24]

Answer:

The gravitational force changing velocity is

$\frac{dF}{dt}=-8\frac{N}{s}$

Explanation:

The expression for the gravitational force is

$F=\frac{k}{r^{2}}\\\\k=10x10^{13} N*km^{2}\\\\r=10x10^{4} km\\\\V=0.4 \frac{km}{s}$

Differentiate the above equation

$\frac{dF}{dt}=\frac{k}{r^{2}}\\\frac{dF}{dt}=k*r^{-2}\\\frac{dF}{dt}=-2*k*r^{-3} \frac{dr}{dt}\\\frac{dF}{dt}=\frac{-2k}{r^{3}}\frac{dr}{dt}$

The velocity is the distance in at time so

$V=\frac{dr}{dt}=0.4 \frac{km}{s}$

$\frac{dF}{dt}=\frac{-2*k}{r^{3}}*0.4\\\frac{dF}{dt}=\frac{-8*10x^{13}N*km^{2} }{(10x10^{4}) ^{3}} \\\frac{dF}{dt}=\frac{-8x10^{12} }{1x10^{12}}$

$\frac{dF}{dt}=-8\frac{N}{s}$

8 0

3 years ago

What is the best way to ensure that the results of your experiment are accurate?

Ainat [17]

Re do the experiment 3 times over again and if you get the same results then it should be correct

6 0

3 years ago

15 POINTS

zhenek [66]

Answer:

Acceleration of the bullet while moving into the clay is -312500 ms⁻²

Explanation:

Given data

Initial velocity (v₁) = 250 m/s Final velocity (v₂) = 0 m/s

Distance (s)= 0.1 m acceleration (a) = ?

Using 3rd equation of motion

2as = v₂²- v₁²

2 × a × 0.1 = 0² - 250²

0.2 × a = -62500

a = -62500/0.2

a = -312500 m/s²

Here negative sign indicate that bullet slow down and it is deceleration i.e negative acceleration.

3 0

3 years ago

elastic collision is a collision in which there is absolutely no loss of kinetic energy true or false

MrRa [10]

True because my physics notes say so

8 0

3 years ago

What does the color of a star indicate

kondaur [170]

Answer:

Its temperature

Explanation:

4 0

4 years ago

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