Mechanics | Relativity Answers

A rocket-powered sled accelerates from rest. After t=10s it has traveled a distance x=400m. What is its speed in km/h at this point?

The maximum straight-line deceleration of a racing car under braking is 5m/s^-2. What is the minimum stopping distance of the car from a velocity of 100km/h? What does the distance become if the velocity has twice this value?

a child pushes a toy cart from rest on a smooth horizontal surface with a force F=5N, directed at an angle ø =10° below the horizontal. calculate the work done by the child in 5s if the carts mass is m=5kg

The brake applied to an car reduce the acceleration 6 m/s in the opposite direction to the motion.if the car takes two seconds to stop after the application of the brake.calculate the distance travelled by the car after applying brake

What is the acceleration of a meteor at a distance 8*10^6m from the center of the earth?

Starting from a rest, a boat increases its speed to 5m/s with constant acceleration.

A) WHAT IS THE boat's average speed?
B) if it takes the boat 4 seconds to reach its speed how far has it traveled?

A ball is projected horizontally from the top of the hill with a velocity of 30ms-1 if it reaches the ground 5sec later, the height of the hill is?

when pendulum is vibrating then no sound is heard why ?

A jet-ski driver wants to head to an island in the St. Lawrence River that is 5.0 km [W50.0S] away. If he is travelling at a speed of 40.0km/h and the St. Lawrence is flowing 6.0 km/h [E]
a) in what direction should he head the jet-ski?
b) How long will it take him to reach the island?

A massless rod of length 2R has masses m1 attached to each end. The rod is free to rotate on the surface of a frictionless table about a pin attached to its center C. A mass m2 is moving across the table at speed v perpendicular to the rod and is aimed directly at one of the masses m1 as shown in the diagram. At time t = 0, m2 collides with m1 and sticks instantaneously, setting into rotation about C. (a) Determine the total linear momentum P of the rod and mass system following the collision. Give both the x and y components and specify their time dependencies, if any. (b) Determine the force F exerted by the pin at C. Give x and y components and specify their time dependencies, if any.