SQL injection is a common vulnerability allowing attackers t…

SQL injection is a common vulnerability allowing attackers to manipulate a database by injecting malicious SQL code into input fields. Below is a piece of JavaScript code that interacts with a MySQL database using user input. Unfortunately, this code is vulnerable to SQL injection. const express = require(‘express’); const mysql = require(‘mysql2’); const app = express(); const port = 3000; const connection = mysql.createConnection({     host: ‘localhost’,     user: ‘root’,     password: ‘password123’,     database: ‘user_database’ }); app.use(express.json()); app.post(‘/getUser’, (req, res) => {     const username = req.body.username;     const query = `SELECT * FROM users WHERE username = ‘${username}’`;         connection.query(query, (error, results) => {         if (error) {             res.status(500).send(‘Database error’);             return;         }         res.json(results);     }); }); app.listen(port, () => {     console.log(`App listening at http://localhost:${port}`); }); Database Name: user_database Tables: users (columns: id, username, password) admin_logs (columns: log_id, admin_action, timestamp)   Question: Explain why the provided JavaScript code is vulnerable to SQL injection. Describe the specific part of the code that leads to this vulnerability (It is required to cite how the exploitation happens line-by-line) (10 points).   Provide an example of a malicious input that an attacker could send to the /getUser endpoint to retrieve all entries from the admin_logs table (the input must work) (10 points).  

3 minutes Both “Emergency Skin” and The Great Transition tel…

3 minutes Both “Emergency Skin” and The Great Transition tell stories about how people respond to climate change, resulting in widespread mitigation of greenhouse gas emissions and adaptation to the changed climate. However, they have somewhat different “theories of change.” That is, they imagine that the process going from “normal life” to and through a major transition works differently. How would you characterize this difference?  

The following mechanical system has a moving pulley of negli…

The following mechanical system has a moving pulley of negligible mass/inertia, a fixed pulley with inertia, J1, and a rack and pinion system. Hint: the displacement of the moving pulley will always be half the displacement of mass, m2. The pinion has an input torque Tin(t). Perform the following for this system:  a) Define a complete Free Body Diagram b) Define a complete set of state variable equations in the proper form, let the velocity of mass, m2, be one of the state variables.