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Sanad AbuJamous

Sanad A.

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(II) Human vision normally covers an angle of about $40^{\circ}$ horizontally. A "normal" camera lens then is defined as follows: When focused on a distant horizontal object which subtends an angle of $40^{\circ},$ the lens produces an image that extends across the full horizontal extent of the camera's light-recording medium (film or electronic sensor). Deter- mine the focal length $f$ of the "normal" lens for the following types of cameras: $(a)$ a 35 -mm camera that records images on film 36 $\mathrm{mm}$ wide; $(b)$ a digital camera that records images on a charge-coupled device $(\mathrm{CCD}) 1.00 \mathrm{cm}$ wide.

(II) Human vision normally covers an angle of about $40^{\circ}$ horizontally. A "normal" camera lens then is defined as follows: When focused on a distant horizontal object which subtends an angle of $40^{\circ},$ the lens produces an image that extends across the full horizontal extent of the camera's light-recording medium (film or electronic sensor). Deter- mine the focal length $f$ of the "normal" lens for the following types of cameras: $(a)$ a 35 -mm camera that records images on film 36 $\mathrm{mm}$ wide; $(b)$ a digital camera that records images on a charge-coupled device $(\mathrm{CCD}) 1.00 \mathrm{cm}$ wide.

Physics for Scientists and Engineers with Modern Physics

Human vision normally covers an angle of roughly 40$^{\circ}$ horizontally. A "normal" camera lens then is defined as follows:When focused on a distant horizontal object which subtends an angle of 40$^{\circ}$, the lens produces an image that extends across the full horizontal extent of the camera's light-recording medium (film or electronic sensor). Determine the focal length f of the "normal" lens for the following types of cameras: ($a$) a 35-mm camera that records images on film 36 mm wide; ($b$) a digital camera that records images on a charge-coupled device (CCD) 1.60 cm wide.

Human vision normally covers an angle of roughly 40$^{\circ}$ horizontally. A "normal" camera lens then is defined as follows:When focused on a distant horizontal object which subtends an angle of 40$^{\circ}$, the lens produces an image that extends across the full horizontal extent of the camera's light-recording medium (film or electronic sensor). Determine the focal length f of the "normal" lens for the following types of cameras: ($a$) a 35-mm camera that records images on film 36 mm wide; ($b$) a digital camera that records images on a charge-coupled device (CCD) 1.60 cm wide.

Physics: Principles with Applications

OPTICAL INSTRUMENTS

X-Rays and X-Ray Diffraction

Questions asked

INSTANT ANSWER

3. Sea Otter Food Web Consider the following list of species and the species they feed on. \begin{tabular}{|l|l|} \hline Species & Species they feed on \\ \hline shark & sea otter \\ \hline sea otter & sea stars, sea urchins, large crabs, large fish and octopus, abalone \\ \hline sea stars & abalone, small herbivorous fishes, sea urchins, organic debris \\ \hline sea urchins & kelp, sessile invertebrates, organic debris \\ \hline abalone & organic debris \\ \hline large crabs & sea stars, smaller predatory fishes, organic debris, small herbivorous fishes, kelp \\ \hline smaller predatory fishes & sessile invertebrates, planktonic invertebrates \\ \hline small herbivorous fishes & kelp \\ \hline kelp & \\ \hline large fish and octopus & smaller predatory fishes, large crabs \\ \hline sessile invertebrates & microscopic planktonic algae, planktonic invertebrates \\ \hline organic debris & \\ \hline planktonic invertebrates & microscopic planktonic algae \\ \hline microscopic planktonic algae & \\ \hline \end{tabular} 1. An incomplete drawing of the food web is given below. Use the table to complete the food web by filling in the names of the species that should appear in the blank spots. 2. Identify the primary produces. 3. Identify everything that eats kelp. 4. Identify everything that eats sea urchins or sessile invertebrates. 5. Are there species that are only predators and not prey?

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1. A predator prey model. The Holling-Tanner predator-prey model takes the form \[ \begin{aligned} \frac{d N}{d t} &=r_{1} N\left(1-\frac{N}{K}\right)-\frac{w N}{d+N} P \\ \frac{d P}{d t} &=r_{2} P\left(1-\frac{j P}{N}\right) \end{aligned} \] where \( N(t) \) is the number of (small) prey at time \( t \) and \( P(t) \) is the predators. In this model the prey satisfies a logistic equation when there are no predators. But the rate that the predators can capture the prey depends on how many prey there are. Moreover, the carrying capacity for the predators depends on the total number of prey available to eat. (a) This system is difficult to work with because it has six different parameters, all of which affect the behaviour of the system. However, each of them has a biological meaning. Write a brief explanation of what each parameter \( \left(r_{1}, r_{2}, k, j, w, d\right) \) means. (b) Use a graphical analysis (nullclines) to determine how many equilibrium points this system has and say as much as you can about where they occur. You do not have to find it algebraically! You can simply sketch the nullclines and then see approximately where they would be. (It is possible to do this without having to plug in any numbers for the parameters, assuming only that the parameters are all positive numbers. However, you may plug in some numbers for them if you wish. The nullclines should look roughly the same regardless of what numbers you use.) (c) Download the Jupyter file: PredatorPrey . ipynb and run it. With the given parameter values, what can you say about the fixed point where neither \( N \) nor \( P \) are zero? (d) Now change \( w \) to 20 (the predators are now better at catching the prey) and run it again. What has happened? Below is a figure about historical data for lynx and hare collected by the Hudson's Bay Company. Does this model seem to capture the correct qualitative behaviour? Predator-prey dynamics

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Problem: A \( 60.0-\mathrm{kg} \) skier with an initial speed of \( 12.0 \mathrm{~m} / \mathrm{s} \) coasts up a \( 2.50 \)-m-high rise as shown in the figure. The snow produces a little friction here. (Treat the incline as a straight slope without the artistically rounded corner shown in the figure.) a) Draw a free-body diagram of the forces that act on them when they are coasting up the hill. b) Determine the magnitude of the normal force when they are on the hill. Which way does the net force point? c) Find their final speed at the top, given that the coefficient of friction between their skis and the snow is \( 0.0800 \).

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Design a roller coaster loop so that the apparent weight at the bottom, just as the car enters the loop, is 5g’s. As input into your design, the car should start from rest 30 m off the ground, and then go down a 40° slope before entering the loop. Ignore friction everywhere.

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ANSWERED

Eduard Sanchez verified

Numerade educator

A stunt driver rounds a banked, circular curve. The driver rounds the curve at a high, constant speed, such that the car is just on the verge of skidding to the outside of the curve.

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ANSWERED

Hubert Agamasu verified

Numerade educator

A wheel with a tire mounted on it rotates at the constant rate of 2.85 revolutions per second. A tack is stuck in the tire at a distance of 36.5 cm from the rotation axis. What is the tack's tangential speed?

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ANSWERED

Hubert Agamasu verified

Numerade educator

A car driving around a circular track has a centripetal acceleration of 99 m/s 2 until it hits a slick spot and slides straight off the track. if the radius of the track is 17 m, what is the car's velocity when it leaves the track?

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ANSWERED

Penny Riley verified

Numerade educator

A 2070 kg space station orbits Earth at an altitude of 549 km. Find the magnitude of the force with which the space station attracts Earth. The mass and mean radius of Earth are 5.98×1024 kg and 6370 km, respectively.

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ANSWERED

Mahnoor Khan verified

Numerade educator

Which statements are true concerning Newton's law of gravitation? The gravitational force is an attractive force. The gravitational force between the Earth and a person is constant, no matter how high the person is above the surface of the Earth. The gravitational force on a satellite is greater at an altitude of 1000 km above the Earth than at an altitude of 500 km. A large and a small object are gravitationally attracted to each other. The magnitude of the gravitational force on the larger object is less than on the smaller. The gravitational force is related to the mass of each object.

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ANSWERED

Mahnoor Khan verified

Numerade educator

Many physical properties, such as force and mass, cannot be measured directly. Rather, some other physical property is measured and the desired physical property is computed from the results. For example, a bathroom scale does not actually measure mass or "weight," but rather the compression distance of a spring. The numerical values on the scale are calibrated from the compression distance using basic physics principles such as Newton's second law. Coefficients of friction cannot be measured directly. In this problem, we are going to learn how we can indirectly measure the coefficient of kinetic friction between two surfaces by directly measuring the expansion of a spring. Consider a 5.45 kg block that is dragged by a spring on a (relatively) frictionless horizontal surface at constant velocity. Suppose the block reaches a rough patch and the spring stretches by 9.25 cm . Compute the coefficient of kinetic friction ???? between the block and the rough patch if the spring has a force constant of 172.0 N/m .

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