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3 years ago

If a car averages 40 mph for 6 hours and then speeds up to average 50 mph for 3 hours

Physics

1 answer:

Otrada [13]3 years ago

3 0

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The water behind Grand Coulee Dam is 1000 m wide and 200 m deep. Find the hydrostatic force on the back of the dam. (Hint: the t

Vika [28.1K]

Answer:

The hydro static force on the back of the dam is $1.96\times10^{11}\ N$

Explanation:

Given that,

Width b= 1000 m

Depth d= 200 m

We need to calculate the average pressure

Using formula of average pressure

$P_{avg}=\rho\times g\times d_{avg}$

Put the value into the formula

$P_{avg}=1000\times9.8\times100$

$P_{avg}=980000\ Pa$

We need to calculate the hydro static force on the back of the dam

Using formula of force

$F = P_{avg}\times A$

Put the value into the formula

$F = 980000\times1000\times200$

$F=1.96\times10^{11}\ N$

Hence, The hydro static force on the back of the dam is $1.96\times10^{11}\ N$

7 0

3 years ago

Good day can I get some help please?

abruzzese [7]

Answer:

432 J

Explanation:

When moving linearly:

Kinetic Energy = (1/2)mV^2

So here you have:

KE=(1/2)(6)(12^2)=(1/2)(6)(144)=432

The unit for energy is Joules (J), so your answer would be 432 J.

8 0

3 years ago

If a wheel rotates 5 times in 90 seconds, what is the period and frequency

Sati [7]

Answer:

i think it should be 18

Explanation:

4 0

3 years ago

In physics, it is established that the acceleration due to gravity, g (in meters divided by sec squared) in meters/sec², at a

kompoz [17]

Answer:

$g(h)=9.81943\ m/s^2$

Explanation:

The given function is

$g(h)=\dfrac{3.99\times 10^{14}}{(6.374\times 10^6+h)^2}$

Now h = the height from the surface of the Earth

Here the building is 458 m tall

$g(458)=\dfrac{3.99\times 10^{14}}{(6.374\times 10^6+458)^2}$

$\Rightarrow g(458)=9.81943\ m/s^2$

So,

$g(h)=9.81943\ m/s^2$

5 0

3 years ago

A 4.5 kg mass is accelerated at 40 m/s/s what is the force that was applied

cestrela7 [59]

Answer:

180 N

Explanation:

Use Newton's second law, F = ma.

m = 4.5 kg; a = 40 m/s/s

F = (4.5)(40) = 180 N

8 0

3 years ago