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3 years ago

Which method of popcorn popping transfers heat into the kernels without any direct

Physics

1 answer:

Svetlanka [38]3 years ago

6 0

Answer:

It is cause by radiation that's the answer

Explanation: the heat project sun rays towards the popcorn which causes it to pop

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A rectangular billboard 5 feet in height stands in a field so that its bottom is 6 feet above the ground. A nearsighted cow with

maw [93]

Answer:

In order to maximize $\theta$ , the cow must stand 3.74 ft away from the billboard, approximately.

Explanation:

The vertical angle subtended by the billboard at the cow's eye can be calculated from

$\theta = \arctan{\frac{7}{x}} - \arctan{\frac{2}{x}}.$

Now, maximaxing $\theta$ , we have

$\theta_{max} = \frac{d\theta}{dx}|_{x=x_0}=0\\-\frac{7}{x_0^2+49} - \left(\frac{2}{x_0^2+4}\right) = 0\\\frac{7}{x_0^2+49} - \frac{2}{x_0^2+4} = 0.$

Solving the equation for $x_0$

$x_0 = \pm\sqrt{14} \approx 3.74.\\$

Which can be interpretated as the cow standing either one or the other side from the billboard. The next plot confirms that $x_0$ 's positive root, gives a maximum for the angle $\theta$ .

4 0

2 years ago

Read 2 more answers

You are out on a hike, and you notice that the line of telephone wires you have been following along a slope is crooked. Two of

ivolga24 [154]

Answer: a creep

Explanation:

3 0

2 years ago

Read 2 more answers

There are_____________ centimeters in 1 meter.

ivanzaharov [21]

Answer: 100

Explanation:

just multiply the value by 100 :)

6 0

2 years ago

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What is the formula of two vectors which are mutually perpendicular?

Svetllana [295]

Answer:

a .(b+c) = a.b+a.c

Explanation:

As the three vectors are perpendicular to each other, one of them must lie perpendicular to the plane containing the other two vectors…say a lies perpendicular to the plane of b and c.(b + c )gives another vector which lies in same plane of c and b .

7 0

2 years ago

Very large accelerations can injure the body, especially if they last for a considerable length of time. The severity index (SI)

Ludmilka [50]

Answer:

a) The severity index (SI) is 3047.749, b) The injured travels 0.345 meters during the collision.

Explanation:

a) The g-multiple of the acceleration, that is, a ratio of the person's acceleration to gravitational acceleration, is:

$a' = \frac{35\,\frac{m}{s^{2}} }{9.807\,\frac{m}{s^{2}} }$

$a' = 3.569$

The time taken for the injured to accelerate to final speed is given by this formula under the assumption of constant acceleration:

$v_{f} = v_{o} + a \cdot t$

Where:

$v_{o}$ - Initial speed, measured in meters per second.

$v_{f}$ - Final speed, measured in meter per second.

$a$ - Acceleration, measured in $\frac{m}{s^{2}}$ .

$t$ - Time, measured in seconds.

$t = \frac{v_{f}-v_{o}}{a}$

$t = \frac{\left(12\,\frac{km}{h} \right)\cdot \left(1000\,\frac{m}{km} \right)\cdot \left(\frac{1}{3600}\,\frac{h}{s} \right)}{35\,\frac{m}{s^{2}} }$

$t = 0.095\,s$

Lastly, the severity index is now determined:

$SI = \frac{a'^{5}}{2\cdot t}$

$SI = \frac{3.569^{5}}{2\cdot (0.095\,s)}$

$SI = 3047.749$

b) The initial and final speed of the injured are $1.944\,\frac{m}{s}$ and $5.278\,\frac{m}{s}$ , respectively. The travelled distance can be determined from this equation of motion:

$v_{f}^{2} = v_{o}^{2} + 2\cdot a \cdot \Delta s$

Where $\Delta s$ is the travelled distance, measured in meters.

$\Delta s = \frac{v_{f}^{2}-v_{o}^{2}}{2\cdot a}$

$\Delta s = \frac{\left(5.278\,\frac{m}{s} \right)^{2}-\left(1.944\,\frac{m}{s} \right)^{2}}{2\cdot \left(35\,\frac{m}{s^{2}} \right)}$

$\Delta s = 0.345\,m$ .

8 0

2 years ago