Mechanics | Relativity Answers

Two objects attract each other gravitationally with a force F. If the distance between their
centers doubles, the gravitational force

A 4 kg mass is moving in a circular path of radius 2.5 m with a constant speed of 5 m/s.
The centripetal force on the mass is ?

A 1100 kg car traveling at 27 m/s starts to decelerate and comes to a complete stop after
578 m. What is the average braking force acting on the car?

A ball is thrown upward at time t = 0.0 s, from a point on a roof 60 m above the ground. The
ball rises, then falls and strikes the ground. The initial velocity of the ball is 28.4 m/s. Consider
all quantities as positive in the upward direction. At time t = 4.3 s, the acceleration of the ball is
closest to

A GIRL THROWS A BALL WITH INITIAL VELOCITY V AT AN INCLINATION OF 45. THE BALL STRIKES THE SMOOTH VERTICAL WALL AT A HORIZONTAL DISTANCE D FROM THE GIRL AND AFTER REBOUNCING RETURNS TO HER HAND. WHAT IS THE COEFFICIENT OF RESTITUTION BETWEEN WALL AND THE BALL ?

TWO PERSONS A AND B HAVING MASSES 50KG AND 60KG RESPECTIVELY ARE SITTING AT THE TWO EXTREME TO A 4m AND LONG PLATFORM OF MASS 40KG KEPT ON A SMOOTH ICE . IF THEY COME TO MIDDLE OF THE BOAT THEN HOW FAR DOES THE MOVE THE BOAT MOVE ON THE ICE DURING THE PROCESS ? (IN cm)

A ROD OF LENGTH 3m AND ITS MASS PER UNIT LENGTH IS DIRECTLY PROPORTIONAL TO DISTANCE X FROM ITS END. THE CENTRE OF MASS OF THE ROD OF FROM THAT END WILL BE AT ?

IN A FREE SPACE , A RIFLE OF MASS M SHOOTS A BULLET OF MASS m AT A STATIONARY MASS M DISTANCE D AWAY FROM IT. WHEN THE BULLET HAS MOVED THROUGH A DISTANCE d TOWARDS THE BLOCK , THE CENTRE OF MASS OF BLOCK - BULLET SYSTEM IS AT A DISTANCE OF ?

A BLOCK SLIDES DOWN AN INCLINED PLANE OF SLOPE ANGLE THETA WITH A CONSTANT VELOCITY. IT IS THEN PROJECTED UP THE PLANE WITH AN INITIAL VELOCITY U. DISTANCE UPTO WHICH IT WILL RISE BEFORE COMING TO REST IS ?

TWO MASSES ARE CONNECTED BY A STRING PASSING OVER A PULLEY ACCELERATING UPWARD.IF A1 AND A2 BE THE ACC. OF THE TWO BODIES THEN , FIND THE RELATION BETWEEN A,A1 AND A2.