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a) A driver was speeding with 40 m/s in his 1800 kg car when he notices a police car with a radar and slows down to a legal speed of 19 m/s. What is the change of the kinetic energy of the car? What is the amount of work done on the car during the deceleration?
b) A repairman of mass 80 kg climbed a 10 m vertical latter to reach the roof of a building in 12 seconds. What is the power developed by the man against gravity?
A hockey puck lies still on ice. Another hockey puck is hit and is on course of collision with it with an initial velocity of +v. The pucks have the same mass and have glue around their edges. Neglect friction with ice. Predict the velocity that the puck which was initially at rest will have after collision, knowing that the pucks will stick together:
a) –v
b) +v
c) –v/2
d) +v/2
A squash ball hits a wall with an initial speed of u and it rebounds in the opposite direction with speed v. Knowing that some energy has been lost through heat in the collision so that v < u and that the duration of the collision is t, find the magnitude of the average force exerted by the wall on the ball.
a) F = m(u+v)/t
b) f = m(u-v)/t
c) F = 0
d) F = m(2v-u)/t
A box rests on a surface that is lifted by one end to create a larger and larger angle with the horizontal. When the surface reaches an angle of exactly 30 degrees with the horizontal, the box begins to slide down. What is the coefficient of static friction?
a) μs = 1/√ 3
b) μs = 2/√ 3
c) μs = √ 3
d) μs = 0.5
find the surface area of the object obtained by rotating y=4+3x^2, 1<=x<=2 about the y axis
Create a class Employee with following data members, name, id, and salary as private data member. Create array of objects for four employees, compare their salary using operator overloading, and display the records of the student who is getting less salary.
Discuss various applications of Initializer List with the help of suitable examples
: Write a program to perform class to basic conversion[Such as: Class is: Triangle with data members base and height(float), and basic type is float(area of triangle)].
Write a program to overload operators in the same program by writing suitable operator friend functions for following expression: O6=((O1+O2) -(O3*O4) * (++O5)) [Here O1,O2,O3,O4,O5 and O6 are objects of a class “overloading”, and this class is having one integer data member]
: Write a program to write 5 book records in a file. Program should also perform random access in the file, after taking input for a particular record number to read and it should also perform random record overwriting after taking input of new record and the record number to overwrite. [Attributes of book: Book_id, Book_price, Book_name, Book_author_name]
#340153 on Dec 2023