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A bird flies in the xy plane with a velocity vector given by \vec{v} = (\alpha - \beta t^2)\hat{i} + \gamma t\hat{j}, with \alpha = 2.0 m/s, \beta = 1.5 m/s^3, and \gamma = 3.7 m/s^2 and where the positive y direction is vertically upward. At t = 0 the bird is at the origin. (a) Calculate the position and acceleration vectors of the bird as functions of time. (Use any variable or symbol stated above as necessary. Do not substitute numerical values; use variables only.) \vec{r} = \left(\alpha t - \frac{\beta t^3}{3}\right)\hat{i} + \frac{\gamma t^2}{2}\hat{j} \vec{a} = (-2\beta t)\hat{i} + \gamma \hat{j} (b) What is the bird's altitude (y coordinate) as it flies over x = 0 for the first time after t = 0? m

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Describe the PRECEDE-PROCEED model. How would you design a program to prevent smoking in adolescents using the PRECEDE-PROCEED model? Describe the PRECEDE-PROCEED model.How would you design a program to prevent smoking in adolescents using the PRECEDE-PROCEED model?

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ARACEL ENGINEERING Trial Balance June 30 Debit Credit Cash 38,000 Accounts receivable 3,500 Prepaid insurance 10,450 Office equipment 90,000 Drafting equipment 60,000 Building 54,000 Land $\hspace{0.2cm}1,664 Accounts payable 63,500 Notes payable 255,400 Common stock 9,130 Dividends 57,400 Services revenue 2,800 Wages expense 5,464 Advertising expense 1,135 Repairs expense $\hspace{0.2cm}274,479 $\hspace{0.2cm}377,964 Totals

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A single-phase transformer with an unknown value of MVA, has a maximum efficiency of 90% at unity power factor. Assume the iron loss to be equal to the full-load copper loss and calculate the efficiency at half-load for the same power factor

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2. Consider the signal x(t)= -5+10cos(2?(75)t-?/4) +24 cos(2?(225)t+?/6) a. Express the signal, x(t) as a sum of complex exponentials using Inverse Euler's formula. b. Is x(t) periodic? If so, give its fundamental frequency and period. C. Plot the spectrum, X(f) of this signal with respect to f in hertz. 3. Given the periodic signal x(t) = 4+4cos (40?t+?/5) + 3sin(60?t-?/6) + 2 cos (120?t) (fo) a. Determine the fundamental frequency and period, T?, the number of frequency components and the Fourier Series coefficients in the finite Fourier representation (ak's in Eqn 3.30) b. Sketch the spectrum of the signal indicating the complex amplitude of each frequency component, C. Consider a new signal y(t)=x(t) +6cos (30?t) -How does the frequency spectrum change? -Is the signal, y(t), periodic? If yes, give fo and T?.

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Text: Need a size() method. Language: C++ class NString { private: char* stringArrayPointer = nullptr; // PTR to char, used to dynamically allocate an array of char size_t Capacity; // Keeps track of the # of elements in the string array size_t Size; // Stores current length of the C string stored in the string array public: NString(); // Default constructor NString(const char* other); // Initialization constructor NString(const NString& other); // Copy constructor ~NString(); // Destructor - calls clear() method NString& operator=(const NString& other); // Overloaded assignment operator NString operator=(const char* other); // Overloaded assignment operator for c string size_t capacity() const; // Method to return the string capacity size_t size() const; // Method to return the string size. THIS IS THE METHOD THAT IS NEEDED TO BE ANSWERED bool empty() const; // Method to return true if string size = 0. Otherwise return false void clear(); // Method to set string size and string cap to -1. Uses delete[] to delete string array. void reverse(size_t n); // Modifies an object's string cap without changing its size or contents bool operator==(const NString& rhs) const; // Return true if chars are identical const char& operator[](size_t pos) const; // Returns element pos of the string array char& operator[](size_t pos); // Return element pos of the string array friend bool operator==(const char* lhs, const NString& rhs); // Returns true if chars are identical friend ostream& operator<<(ostream& lhs, const NString& rhs); // Overloading insertion operator }; size() method that doesn't work: size_t NString::size() const { return Size; } My program crashes when trying to make an object in main.

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what is the main idea on page 6 in the Fragile Frog?

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Seeing patterns means that a sociologist needs to be able to: a. compare the behavior of individuals from different societies b. compare one society to another c. identify similarities in how social groups respond to social pressure d. compare individuals to groups

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Consider the following population linear regression model of electricity usage: Y = 50 + 2 X + u, where Y is electricity usage (in kilowatts) and X is temperature. An artificial sample consisting of five individuals has the following values of (X,Y): (20,70), (15,30), (?,150), (35,153), (5,?). Suppose in this artificial sample, the sample mean of X is 25, the sample mean of Y is 100, the sample variance of X is 36, the sample variance of Y is 1200, and the sample covariance of X and Y is 52. What is the slope estimate in the regression of Y on X?

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Draw electric field wave amplitude (E) - theta dependence for this system. Refractive index (n1) of the IR element: 2.35 + 0i. Refractive index of organic material (n + k) = 1.5 + 0.013i. Remember that n and k are the real and imaginary parts of the refractive index. n is the refractive index you learned in high school (for example, the values of n are 1, 1.33, and 1.5 for air, water, and glass respectively). k is the absorption part (sometimes called the extinction factor) of the refractive index material. Higher k means larger absorption of the electromagnetic waves by a given functional group in the specimen you are probing. The wavenumber for CH3 wagging mode is 1170 cm^-1.

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kathy w.