Mechanics | Relativity Answers

It takes you 8.2 min to walk with an average
velocity of 2.1 m/s to the north from the bus
stop to the museum entrance.
How far did you walk?

Sally travels by car from one city to another. She drives for 27.0 min at 72.0 km/h, 54.0 min at 33.0 km/h, and 39.0 min at 74.0 km/h, and she spends 8.0 min eating lunch and buying gas.

(a) Determine the average speed for the trip.

The distance between 2 trolleys is D. The mass of 1 trolley is 2 unit, the other is 1 unit. at t= 0 seconds, the distance of the 1 unit trolley is also D distance from the wall. The two trolleys are both moving at the same speed V towards each other initially and they collide head on with each other at t = 5s. Immediately after the collision, both trolleys bounce off in opposite direction and the 1-unit mass trolley reaches its original position at t = 9s. Both trolleys continue their motion and the 1-unit mass trolley eventually hits the wall and bounces back at the same speed at which it hits the wall. At what time will the 1-unit mass trolley hit the 2-unit mass trolley again? (You may assume that friction force is negligible throughout the motion of the two trolleys)

A curved stretch of an express way of radius of curvature 300 m is banked at an angle of 5 degree to the horizontal.&
If the limiting friction between the road surface and the tyres of a car is 4000N, what is the maximum speed of the car sothat it will not skip off the road?

Two cars travel simultaneously at a common point. Car A travels at a rate of 25 m/s and accelerates at 2.5 m/s2 . Car B starts from rest and accelerates at 7.5 m/s2. How long will the two car cover the same displacement?

Calculate the force needed to hold a 2000 kg car on a ramp that makes an angle of 30 degrees with the horizontal, if the force is to be applied parallel to the ramp.

What is relative velocity?

Explain why Galilean transformation do not hold good for light.

Why the work done formula is scalar and the force and distance is vector? What is the reason?

A body travels 2m in the 2nd sec and 6m in the next 4 seconds.What will be the distance travelled in the 9th sec?