Mechanics | Relativity Answers

A 10 kg object is spun around in a circle by a rope horizontally above the ground. The length of the rope is currently 5 m. How much more or less force is needed to maintain a velocity of 12 m/s if the rope is extended by 3 m?

A 1.3 kg ball at the end of a 1.1 m string swings in a vertical plane. At its lowest point the ball is moving with a speed of 14 m/s. (a) What is its speed (in m/s) at the top of its path? (b) What is the tension (in N) in the string when the ball is at the bottom and at the top of its path?

A body is dropped from a height of 15m, if the mass of the body is 1.50kg, what is the force acting on it during its fall? Take g=10m/s

An unbalanced force of 2.5 x 10^3 N is applied to an object with a weight of 3.0 x 10^3 N on a frictionless surface. What is the object's acceleration?

In a nuclear reactor one dueterium atom (D) and one triton atom (T) at rest decay into on alpha particle (He) and one neutron (n). How to obtain an expression for the momentum of the alpha particle and the neutron?

An object with an initial speed of 4.21 m/s accelerated at a speed of 2.45 m/s^2 over a distance of 12.3 m across a sheet of ice. The object then hits a rough patch causeing the object to come to rest at 5.82 s. How long was the object accelerating for on the ice? What was the rate of acceleration of the object when sliding on the rough section? What was the total displacement of the object throughout the entire trip?

50 J of work must be done to lift a vase from the ground up on to a shelf. a When the vase is on the shelf, what is its gravitational potential energy? b If the vase falls from the shelf, how much kinetic energy does it have just before it hits the ground? (Assume that air resistance is negligible.) c What happens to this energy after the vase has hit the ground?

The displacement of an oscillatior is written as y(t)=asin(wt+-u) whereas the equation of a wave is written as y(x,t)=asin(wt-kx) highlight the difference between the two

We want to construct a formula for the acceleration

A ball of mass 0.5 kg collides with a wall at a speed of 15.0 ms−1 and bounces back with a speed of 12.5 ms−1. If the average force exerted by the ball is 1100 N calculate the impulse and the time for which the collision lasted.