Mechanics | Relativity Answers

On the way to school, the bus speeds up from 20 m/s to 36 m/s in 4 seconds. What distance does the bus cover in this time frame?

For the rollercoaster x=22 m. A loaded 519 kg roller coaster cart has 8.8104*10^4 Kinetic energy at point x. And 1.8627*10^5 of KE at point Y. What is the total mechanical energy at point x and Y? What is the height of the track at point Y?

How much distance (in m) will it take a car to stop when a light turns yellow if it is travelling at the speed limit of 60 km/h? How long should the yellow light be if it is to turn red right after they stop inside this distance?
Drivers do not react right away when they see the light change; human reaction times vary from 0.50 s to 1.0 s. In your calculation, assume the driver does not react for 1.0 s. In other words, the car continues to travel at the speed limit for 1.0 s after the light has turned. Then the driver brakes to a stop at an acceleration of 3.0 m/s2.

2. Using your result from Question 1, determine how long the yellow light needs to be to allow vehicles that are just inside that distance to continue at the speed limit and clear the intersection before the light turns red. For a car to clear the intersection, its back end must be out of the intersection.

A rectangular plank of wood of length 2.8m is floating horizontally in still water, as shown in figure. If the cross-section of the wooden plank is of rectangular form, of width B= 280 mm and of thickness, D=80 mm, determine the maximum bending stress in the plank, assuming that concentrated mass of 320 kg is placed at its mid span. Let g=9.81m/s^2. Neglect the self-weight of the plank.

A particle is projected at an angle Alpha to the horizontal which grazes with top of the Wall of height B located at a horizontal distance of A from point of projection. then H max of the projectile is?????

a train travels 50 km in half hour. it the stops at a station for 20 mins, before traveling for 2 hours at an average speed of 90 km/h what was the trains average speed over the whole journey

The girl is swinging a conker on a string at a steady speed in a circular path horizontally above her head
What force contribute to the centripetal force in order to keep the conker in its circular path

Calculate the pressure exerted by a 35 N cylinder with a base radius of 5 cm while resting on a floor

what’s the work done in pushing a 5kg bag half a metre across a desk

A projectile like a stone is thrown with an initial speed 10 m/s at an angle of 30 degree to the surface of a hill inclined at an angle of 20 degree to the horizontal.
If the projectiles path is imaginaryly extended, it intersects a plane parallel to the surface of the incline at an angle 90 degree to it.Then the distance between the incline and the imaginary plane is?