Mechanics | Relativity Answers

The inner diameter of a test tube can be measured accurately using a

The amount of force needed to keep a 0.5kg baseball moving at a constant speed of 4 m/s on frictionless ice is

Derive the kinematic equation ∆x = vt + ½ at2 for constant acceleration. Explain all
steps and symbols used.

A series connected composite member ABCD consists of a brass rod BC, 50mm in diameter and 200mm long, to the ends of which are concentrically welded steel rods of 20mm diameter and 100mm in length. The member is supported at A and D as shown in figure 4. When an axially aligned force is applied at D in the positive x direction, point D moves 0.15mm. (i) The axial movement of points B and C (ii) The axial stress in each part of the composite member

See the picture on the board. In 1943, there was a gorilla named N’gagi at the San Diego Zoo; its mass was 310 kg. If N’gagi were to hang from a bar as shown, what torque would the gorilla exert about point A? Assume the bar has negligible mass.

A 1000 kg car traveling @ 30 m/s, 30 degrees S of E collides w/a 3000 kg Truck heading NE @ 20 m/s and makes the collision completely inelastic. Inelastic? Estimate the final dir then find how fast and in what dir they are traveling after the crash.

With fuel prices for combustible engine automobiles increasing, researchers and manufacturers have given more attention to the concept of an ultralight car. Using carbon composites, lighter steels and plastics, a fuel-efficient car can be manufactured at 540 kg. How much less does an ultralight car weigh compared to a 1450-kg Honda Accord ?

A motor bike starting from rest accelerates at a constant rate of 3.0ms-2
What is the velocity of the car after it travelled 45.5m

6. An airplane whose air speed is 650km/h is supposed to fly in straight path 35° north of
east. But a steady 95 km/h wind is blowing from north. In what direction should the
plane head and what is the plane resultant speed?

Everyone knows the twin paradox right? Well, what I was thinking was: What if the twin in the rocket travelled in a circle and not in the oval-like shape they do? This would mean that the centripetal-acceleration would be constant and there would only be one point of deceleration, meaning one Frame of Reference. I am just wondering what happens with the twin on the rocket? Do they age slower? Could someone who understand General Relativity a bit better explain this to me?