A curve road of diameter 1,8 km is banked so that no friction is required at a speed of `30 ms^-1`. What is the banking angle.

A brass rod of length 50 cm and diameter 3.0 mm is joined to a steel rod of the same length and diameter. What is the change in length of the combined rod at 250 ^@C , if the original lengths are at 40.0 ^@C ? Is there a ‘thermal stress’ developed at the junction? The ends of the rod are free to expand (Co-efficient of linear expansion of brass = 2.0 xx 10^-5K^-1 steel = 1.2 xx 10^-5 K^-1) .

Abdul, while driving to school, computes the average speed for his trip to be 20 km h-1 . On his return trip along the same route, there is less traffic and the average speed is 30 km h^-1 . What is the average speed for Abdul's trip?

Define impulse. A machine gun of 10kg mass fires 25 gm bullets at the rate of 5 bullets per second with a speed of 500 ms^(-1) . What force must be applied to the gun to hold it in position.

A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km h ^-1 . Finding the market closed, he instantly turns and walks back home with a speed of 7.5 km h^-1 . What is the magnitude of average velocity.

A particle is projected at an angle of 45^@ with a velocity 9.8ms^-1 . What is horizontal range.

A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km h ^-1 . Finding the market closed, he instantly turns and walks back home with a speed of 7.5 km h^-1 . What is the average speed of the man over the interval of time (i) 0 to 30 min, (ii) 0 to 50 min, (Hi) 0 to 40. min? [Note: You will appreciate from this exercise why . it is better to define average speed as total path length divided by time, and not as magnitude of average velocity. You would not like to tell the tired man on his return home that his average speed was zero!]

A person cannot see objects nearer than 1.2 m from his eyes. He wants for read a newspaper placed at a distance of 30 cm clearly. What is the nature and the power of lens required for this purpose?

A player throws a bail upwards with an initial speed of 29.4 m s^-1 . To what height does the ball rise and after how long does the ball return to the player’s hands? (Take g = 9.8 m s-2 and. neglect air resistance).

A bomber piane is moving horizontally with a speed of 500ms^-1 and a bomb relased from it strikes the ground in 10s. The angle it strikes the ground is