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3 years ago

14

An object falls freely from height H. if it takes one second to travel last half of total displacement find height H priop to th

e fall.

1 answer:

qaws [65]3 years ago

4 0

Answer:9.82 m

Explanation:

As we know from equation of motion

S=v*t +0.5 a t^2

Know s=H/2

a =9.82

t=1

V=0

Plugging the values

H*0.5=0+0.5*9.82*1^2

H=9.82 m

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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

Now set the tension to low and wiggle the wrench to create more waves. Can you explain how moving the first point on the string,

Hatshy [7]

Answer:

When the string moves, it creates a very small change in the distance to the next point, th

Explanation:

When the string moves, it creates a very small change in the distance to the next point, this generates a restoring force that tends to push the string back, this small disturbance propagates along the string and is what creates the pulse.

This is similar to what happens when a spring is stretched and a restoring force is generated shaved by the law of shortening.

F = k Dx

4 0

2 years ago

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A bullet is shot vertically upward with an initial velocity of 128 ft/s. The bullet's height after t seconds is y(t) = 128t - 16

saul85 [17]

The height of the bullet when the velocity is zero is 256 ft.

<h3>Height of the bullet when the velocity is zero </h3>

The height of the bullet when the velocity is zero is determined by taking derivative of the function as shown below;

$v = \frac{dy}{dt} = 128 -32t \\\\when \ v \ is \ zero\\\\v = 0\\\\128 - 32t = 0\\\\32t = 128\\\\t = \frac{128}{32} \\\\t = 4 \ s$

The height of the bullet at this time is calculated as follows;

$y(4) = 128(4) - 16(4)^2\\\\y(4) = 256 \ ft$

Learn more about height of projectiles here: brainly.com/question/10008919

6 0

2 years ago

A frequently quoted rule of thumb in aircraft design is that wings should produce about 1000 N of lift per square meter of wing.

svetlana [45]

Answer:

v₂ = 63.62 m / s

Explanation:

For this exercise in fluid mechanics we will use Bernoulli's equation

P₁ + ρ g v₁² + ρ g y₁ = P₂ + ρ g v₂² + ρ g y₂

where the subscript 1 refers to the inside of the wing and the subscript 2 to the top of the wing.

We will assume that the distance between the two parts is small, so y₁ = y₂

P₁-P₂ = ρ g (v₂² - v₁²)

pressure is defined by

P = F / A

we substitute

ΔF / A = ρ g (v₂² - v₁²)

v₂² = $\frac{\Delta F}{A \ \rho \ g} + v_1^2$

suppose that the area of the wing is A = 1 m²

we substitute

v₂² = $\frac{1000}{1 \ 1.29 \ 9.8} + 63^2$

v₂² = 79.10 + 3969

v₂ = √4048.1

v₂ = 63.62 m / s

7 0

3 years ago

A substance contains only one type of atom. The substance is a/an ____________. A. solution B. element C. mixture D. compound

Alex17521 [72]

The answer to this question is:B. Element

3 0

3 years ago

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