Mechanics | Relativity Answers

Car of mass 200kg travels around a fat circular racetrack of radius 85m. The car starts at resy and its speed increases at constant rate, tangential acceleration:0.6ms^-2. What is the speed of the car when its centripetal and tangential acceleration are equal?

a driver traveling at 12m/s sees a stalled vehicle 17m ahead of his car. he steps on the brakes to slowdown the car. At what rate must the car slow down so that it stops just before hitting the stalled vehicle? Assume that the drivers reaction time is 0.25s. Reaction time is the time for a person to notice , think, and act in response to a given situation.

Explain the principle of jet propulsion and further explain how this principle is applicable in jet engines and also in rockets.

a empty plastic box in water having acceleration of g/6 upward.how much sand is required that the box will move with acceleration of g/6 downward?

A ball is thrown horizontally from a height of 5.5meters with an initial speed of 25m/sec.What will be the magnitude of its velocity.?

a motor car slows down from 72km/h to 332km/h over a distance of 25m.if the breaks are applied with the same force.caculate:-

i) total time in which it comes to rest.

ii)distance travelled by it.

A ballon is going upwards with velocity of 12 m/s. It releases a packet when it is at a height of 65m from the ground.calculate the time taken for the packet to reach the ground.
plz help.

An object of 6 kg mass was at rest. After that a 30 N force is imposed on it. What will be
kinetic energy after 10 sec time?

a physics student drops a watermelon from the roof of the building. he hears the watermelon splat 2.50 seconds later. how high is the building? the speed of the sound is 340m/s. ignore air resistance.

a sledge of mass M has two men each of mass m.first man jumps with some velocity when the sledge starts to move.to stop the movement of sledge the second man jumps with velocity V.
calculate the velocity with which the first man would have jumped?