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2 years ago

Can someone help me?? A car travels 1026 km in 6 hours. Find its average speed.

Physics

2 answers:

tankabanditka [31]2 years ago

5 0

The average speed of the car is 171.

Vinvika [58]2 years ago

3 0

Answer:

171

Explanation:

To work out average speed, you have to do distance divide by time.

1026 divide by 6= 171

I hope that helped you.

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The half-life of a certain element is 100 days. How many half-lives will it be before only one-eighth of this element remains?

Natalka [10]

Answer:

Explanation:

The half-life is the time it takes for the amount of radioactive isotope to halve. Therefore, we have:

- After 1 half-life, only 1/2 of the element will be left

- After 2 half-lives, only 1/4 of the element will be left

- After 3 half-lives, only 1/8 of the element will be left

So, it will take 3 half-lives for the element to become 1/8 of its original amount.

Mathematically, this can be also verified by using the equation

$\frac{N(t)}{N_0}=(\frac{1}{2})^\frac{t}{\tau_{1/2}}$

where

N(t) is the amount of the element left at time t

N0 is the initial amount of the element

$\tau_{1/2}$ is the half-life

Substituting $t=3\tau_{1/2}$ (3 half-lives), we find

$\frac{N(t)}{N_0}=(\frac{1}{2})^3=\frac{1}{8}$

7 0

2 years ago

you work at a Dave's donut shop the shop sells a dozen donuts for 6.99 dollars Dave redesigned the Box used to hold one dozen do

Fofino [41]

Answer:

A box of donuts would cost: b = 3.84 + 0.18f

First, we have to find the total cost of the donuts.

12 x 0.32 = 3.84

Next, we need to determine the cost of the box. However, we don't know the surface area, just the cost per foot. We can multiply the number of square feet of the box by $0.18 to find the cost.

So our equation could be: b = 3.84 + 0.18f (where f is the surface area of the box in square feet)Explanation:

7 0

2 years ago

Read 2 more answers

Two drums of the same size and same height are taken.

Gelneren [198K]

Answer:

i) The pressure acting on the base of B will be half the pressure acting on the base of A

ii) The pressure acting on the base of B will be the same as the pressure acting on the base of A

iii) The pressure on the base of drum A will be slightly less than the pressure on the base of drum B

Explanation:

The pressure acting on the base of the drum, P = h·ρ·g

Where;

h = The level of the liquid in the drum

$h_{max}$ = The height of the drums

ρ = The density of the liquid in the drum

g = The acceleration due to gravity ≈ 9.81 m/s²

i) If A is completely filled, we have $h_A$ = $h_{max}$

Therefore, $P_A$ = $h_{max}$ × $\rho_{liquid}$ ×g

If B is half filled, we have, $h_B$ = (1/2)· $h_{max}$

$P_B$ = (1/2) × $h_{max}$ × $\rho_{liquid}$ ×g

Therefore, $P_B$ = (1/2) × $P_A$

The pressure acting on the base of B will be half the pressure acting on the base of A

ii) If both A and B are each filled with water (the same liquid), then the pressure on their bases will be $P_A$ = $h_{max}$ × $\rho_{water}$ ×g = $P_B$ , the same, given that the acceleration due to gravity, g, is constant and the same in Nepal and India

iii) If A is filled with water, and B is filled with salty water, we have that, the density of salty water is slightly higher than water, therefore, we get;

$P_A$ = $h_{max}$ × $\rho_{water}$ ×g < $P_B$ =

The pressure on the base of drum A will be less than the pressure on the base of drum B.

3 0

2 years ago

What never change despite what planet you go to

laiz [17]

Your mass will never change despite if you go to Jupiter, Uranus, Mars, Earth, or any planet.

7 0

3 years ago

Is "A firecracker that has not been lit kinetic, or potential energy?

love history [14]

A firecracker before been lit has potential energy in it. It is chemical potential energy which is due to the explosives in it.When it is lit, it gets converted into heat,light and kinetic energy.

7 0

3 years ago