MATERIALS SCI + ENGR: INT W/ACCESS
10th Edition
ISBN: 9781119808084
Author: Callister
Publisher: WILEY
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Chapter 21, Problem 24QAP
To determine
To describe:
The phenomenon of photoconductivity:
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6. Answer the following questions. Take help from ChatGPT to answer these questions
(if you need). But write the answers briefly using your own words with no more than
two sentences and make sure you check whether ChatGPT is giving you the
appropriate answers in our context.
a) What is the difference between a regulator and a servo system? Which is harder
to build?
b) What are the advantages and drawbacks of manual control systems over
automatic ones?
c) Does transfer exist for the non-linear systems?
d) Explain the convolution property of the Laplace transform.
e) What are the advantages of using state-space representation?
The cantilever truss is part of vertical support system subjected to dead loads (D) and snow loads (S). The dead load is 70 psf (pound per square foot) and the snow load is 40 psf. The trusses are spaced at 20 ft apart. a) Determine the joint vertical loads PD and PS acting on joints C, D, E, F, and G. b) Determine the axial force in column JL due to dead load and due to snow load. c) Determine the force in truss member JF due to dead load and due to snow load using the method of sections. d) Using the LRFD load combinations, what it the maximum load Pu in column JL? e) Using the LRFD load combinations, what it the maximum load Pu in truss member JF?
4. Find the differential equation of the following system whose transfer function is
given by
S+3
H(s)
=
s3 +3s+2
Chapter 21 Solutions
MATERIALS SCI + ENGR: INT W/ACCESS
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- 6.2 User interface (main.c) You will be using files for saving and loading dictionaries. For this, we will use the standard library, in which the "file object" is a pointer to a structure that you manipulate using some functions. This follows the pattern we've been using for the dictionary library: users do not know what is in that structure and only access it through an interface. 6.2.1 dmp This command does not manipulate files; it simply dumps the dictionary to the standard output. It should start by printing BEGIN_DUMP, then all the pairs key: value separated by newlines, then END_DUMP: > put abc:def > put 123:456 > dmp BEGIN DUMP abc:def 123:456 END_DUMP > To implement this, refer to the example file print.c in Section dict apply. The order in which the elements are printed is not important (it depends on how you implemented your dictionary).arrow_forwardI don't know how to solve thisarrow_forwardneed helparrow_forward
- A. The box below shows the format of a virtual address. Indicate (by labeling the diagram) the fields (if they exist) that would be used to determine the following: (If a field doesn't exist, don't draw it on the diagram.) VPO The virtual page offset VPN The virtual page number TLBI The TLB index TLBT The TLB tag 15 14 14 13 12 11 10 9876543210 B. The box below shows the format of a physical address. Indicate (by labeling the diagram) the fields that would be used to determine the following: PPO The physical page offset PPN The physical page number CO The block offset within the cache line Cl The cache index CT The cache tag 11 109876543210 12 11arrow_forwardA useful helper function for opening a socket connection to a server was introduced in the course: int open_clientfd(char *hostname, int port) { } int clientfd; struct hostent *hp; struct sockaddr_in serveraddr; if ((clientfd = socket(AF_INET, SOCK_STREAM, 0)) h_addr_list[0], (char *)&serveraddr.sin_addr.s_addr, hp->h_length); serveraddr.sin_port = htons(port); /* Establish a connection with the server */ if (connect(clientfd, (SA *) &serveraddr, sizeof(serveraddr)) < 0) return -1; return clientfd; The problem with this function is that it is not thread safe: it uses function gethostbyname, which returns a pointer to a static variable. On the following page, reimplement open_clientfd in a thread safe way using the lock-and-copy technique. (Note 1: that the new function will take an additional input: a semaphore that will control access to the critical section so only one thread at a time can call gethostbyname and read the result stored in a static variable. Note 2: a call to malloc is…arrow_forwardPreliminary Laboratory (Prelab) Work Complete the following tasks in the space provided below for the circuit shown in Figure 2. 1. Use voltage division to compute the phasor voltages VR and Vc assuming nominal values of R = 1000[2], C = 0.01[u], and a cosinusoidal time-domain source voltage signal given by equation 5 below. Voltage division must be used to receive any credit. (10 points) equation (5) Vs(t) = VRMSCOS(ct + 0) = 5cos(@t + 0) = 5cos(62832t + 0) = 5cos(62832t) [V] =VRMSCOS(2лft + 0) = 5cos[2л(10000)t + 0] = 5cos[2л(10000)t] [V] 2. Compute the phasor current, Is. (3 points) 3. Calculate the complex power, S, active power, P, and reactive power, Q, for the circuit. (4 points) 4. Construct the phasor diagram for the circuit, and show mathematically that the phasor (vector) sum of the phasor voltages VR and Vc is equal to Vs. (3 points) Agilent 33210A (BECC4242) or Vs Keysight 33500B (BECC4261) Function Generators Is R w + VR Vc + + Zc V out =Vc Figure 2: RC circuit connected…arrow_forward
- 4 Part 1: get, put, del 4.2 User interface (main.c) The main function will contain the main loop of your program and should behave like this: 1. Create an empty dictionary 2. Print ">" on the standard output (this is important). 3. Read the command from the user; the first three characters are the command name, then a space, then the arguments, and a newline character \n. 4. If the command is unknown, exit. 5. If end-of-file was read (EOF), destroy the dictionary and exit. 6. Otherwise, execute the corresponding command and go back to 2. To read from the standard input, you will be using the stream reading functions from the standard library, with stream being stdin, a variable defined in : • int fgetc (FILE* stream): read one character of the given stream. This returns the constant EOF on end of file. • char* fgets (char* s, int size, FILE* stream): read in at most one less than size chars from stream and stores them into the buffer pointed to by or a newline. If a newline is read, it…arrow_forward6.1.1 dict_apply This function has the (nontrivial) type: void dict_apply (const dict_t* dict, const dict_apply_fun_t fun, void* arg); For each pair key/value in dict, it will call the function fun with arguments (key, value, arg). This is a type of "for each" loop (or map), showing that C is well capable of using advanced programming concepts, albeit with a somewhat contrived syntax. The type dict_apply_fun_t is the interesting part here: typedef void (*dict_apply_fun_t) (const char* key, const char* val, void* arg); This defines a type dict_apply_fun_t as "pointer to a function that returns void and takes two arguments of type const char* and one of type void* (untyped pointer)". Indeed, functions have addresses (more on that in Ch. 7), so one can talk about pointers to functions. To call the function pointed at by fun, one can use a normal function-call syntax (fun (key, value, arg)) or dereference the pointer first ((*fun) (key, value, arg))-this is a matter of taste. In the…arrow_forward7 Bonus Part For extra bonus point, you can implement a data structure that is more efficient than (double) linked lists. Linked lists have terrible performances: when searching for an element that is no in the dictionary you need to go through all pairs key/value. Tweaking your dict_put to ensure that the list is always sorted by keys does provide a speedup, but of only 30%, which is still much too slow. By sorted here, we mean according to the return value of strcmp(3). Indeed, this function does more than just checking whether two strings are equal: • If strcmp (a, b) 0, then a would appear after b in a real-life dictionary. You can score most bonus points with a simple binary search tree based on this order. The idea is to have a binary tree where each node stores a pair key/value. The nodes to the left of a given node contain keys that are smaller, while the nodes to the right contain keys that are greater (according to the order given by strcmp(3)). To search for a key, we start…arrow_forward
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