What happens when a blaring siren moves away from you

2. A new racecar track is being created, and the owners want the cars to complete 10

jeka57 [31]

Answer:

0.45 miles

Explanation:

since, car will be running on the edge of track, distance covered in one lap by car will be equal to circumference of track.\

we will use value of pi as 22/7

Circumference for any circular shape is given by $\piD$ $\pi D$

Hence, in one lap $\pi D$ distance will be covered

in 7 laps $7 \pi D$ distance will be covered.

but is given that 7 laps should be equal to 10 miles

so 10 miles will be equal to $7\pi D$

$7\pi D= 10 \ miles\\=> 7*(22/7)* D= 10 \ miles\\=> 22D = 10 \ miles\\=> D = 10/22 \ miles\\=> D = 0.45 \ miles$

Thus, diameter of track will be 0.45 miles to meet the requirement.

3 0

3 years ago

Alligators and other reptiles don't use enough metabolic energy to keep their body temperatures constant. they cool off at night

drek231 [11]

To compute for the heat, $Q$ needed to be absorbed or released, we need

$Q = mc\Delta T$

where $m$ is the mass of the alligator, $\Delta T$ is the change in temperature, and $c$ is the specific heat of the alligator's body. Plugging in all the information we have,

$Q = (300 kg)(3400 kJ/K)(30-25) = 5100000 J$

Recall that 1 Watt = 1 J/s, thus time needed to absorb radiation from the sun is

$t = \frac{Q}{W}\\ t = 4250 seconds$

That means it takes 4250 seconds for the alligator to warm up to be able to absorb the radiation from the sun.

Answer: 4250 seconds

4 0

4 years ago

In an attempt to reduce the extraordinarily long travel times for voyaging to distant stars, some people have suggested travelin

Vika [28.1K]

Answer:

Explanation:

Let the required velocity of rocket be v .

We shall use the formula of time dilation to find the velocity of rocket .

t = $\frac{t'}{\sqrt{1-\frac{v^2}{c^2} } }$