Mechanics | Relativity Answers

a person travels by car from one city to another with different constant speeds between pairs of cities. she drives for 30.0 min. at 80.0 km/h, 12.0 min. at 100 km/h, and 45.0 min. at 40.0 km'h and spends 15.0 min. eating lunch and buying gas.
A) determine the average speed for the trip.
B) determine the distance between the initial and final cities along the route.

A ship leaves the island of Guam and sails 285km at 40.0 degrees north of west. In which direction must it now head and how far must it sail so that its resultant displacement will be 115km directly east of Guam

a worker drops a wrench from the top of a tower 80 meters tall. What is the velocity when the wrench strikes the ground assuming the acceleration to be -9.81 m/s^2

the displacement of a body is given by 2s=gt^2,where g is constant,the vel of the body at time t is
a)gt b)gt/2 C)gt^2/2 D)gt^2/2

You are traveling on an airplane. The velocity of the plane with respect to the air is 170.0 m/s due east. The velocity of the air with respect to the ground is 46.0 m/s at an angle of 30° west of due north.
1) What is the speed of the plane with respect to the ground?

A sphere of metal has a radius of 4.7 cm and a density of 9.39g/cm^3. What is the mass of the sphere? Answer in units of g

A body with unknown initial velocity moves with constant acceleration. At the end of 9.15 s, it is moving at a velocity of 52.0 m/s and it is 219.0 m from where it started. Find the body's acceleration and its initial velocity.

a body is attached to alower end of aspring suspended from the foot of a lift .when the lift is at rest,a body produces an elongation of 2cm in the spring. when the lift moves downward with an acceleration ,the elongation is changed to 1.95 cm. find the acceleration of the lift.

As part of a physics experiment, you stand on a bathroom scale in an elevator. Though your normal weight is 510 N, the scale at the moment reads 640 N. Calculate the magnitude of the elevator's acceleration.

John runs at 4.6 m / s for 6.45 s along the x axis. How far does John run ?