Write a function that gets the user’s username and password. Then it checks if the username exists in a pre-defined dictionary of the registered users. If the username is found, then it checks for the corresponding password. If the password matches, then it returns (True) value. If the password does not match, it returns “False”. If the username does not exist in the dictionary, it asks for a new username and password and informs them that “user not found”.

When four identical resistors are connected to an ideal battery of voltage V = 10 V as shown in the figure, the current I{“version”:”1.1″,”math”:”I”} is equal to 0.20 A. What is the value of the resistance R{“version”:”1.1″,”math”:”R”} of the resistors?

A uniform magnetic field of magnitude 0.80 T in the negative z-direction is present in a region of space, as shown in the figure. A uniform electric field is also present and is set at 7.6 x 104 V/m in the +y-direction. An electron is projected with an initial velocity of 9.2 x 104 m/s in the +x-direction. The y-component of the net initial force on the electron is closest to which of the following?

A battery-powered global positioning system (GPS) receiver operates at a voltage of 9.00 V and a current of 0.130 A. How much charge passes through the receiver during 30.0 minutes?

Find the EXACT value of  Cos(112.50)

Find the “x” component for the Resultant vector of this system if A = o, B = o, C=o and the vectors have the following Magnitudes: (write your answer as a decimal value rounded to 2 decimal places)

Find the exact value of Cot(A) if Sin(A) = and the angle “A” is in Quadrant 2

Draw the triangle that would be used to solve the following problem: Sin(Sec-1(x))  

Find the EXACT value of  Cos(157.50)

Find the EXACT value of  Cos(112.50)