The distance to a particular star, as measured in the earth’s frame of reference, is 7.74 ly (1 light year is the distance light travels in 1 year). A spaceship leaves earth headed for the star, and takes 3.49 yr to arrive, as measured by passengers on the ship. Part A) How long does the trip take, according to observers on earth? Express your answer with the appropriate units. t = yrPart B) What distance for the trip do passengers on the spacecraft measure?

Crowbar of 5 metre is used to lift an object of 800 metre if the effort arm is 200cm calculate the force applied

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.

Aturntable that spins at a constant 74.0 rpm takes 3.10 s to reach this angular speed after it is turned on. find its angular acceleration (in rad/s2), assuming it to be constant, and the number of degrees it turns through while speeding up.