Mechanics | Relativity Answers

a student eats dinner rated at 2000 kilo calories . he wishes to do equivalent amount of work in the gynasium by lifting a 50 kg mass. how many times must he raise the weight to expand this much energy ? assume that he raise s the weight a distance of 2 m each time and that no work is done when the weight is dropped at the floor....

a ship is heading due west at a steady speed of 15km/hr. a current of 3km/hr is running due south. calculate the velocity of the ship relative to the seabed.(hint: the velocity of the ship plus the velocity of the current will add up to the total velocity of the ship relative to the seabed.)

A car had a velocity of 4.0 m/s when it started to accelerate up a hill
5 sec later it is rolling down the hill at 6.0 m/s
what is the acceleration and displacement

a metal rod with density od 7000kg/m3 and diameter 40mm has a mass if 1.76kg. calculate its length

a mass of 3kg rests on the smooth table and tied by a light cord passing over a frictionless pulley to 5kg mass hanging freely.what is the acceleration of the system which is released?

An elevator is moving at 1.1 m/s as it approaches its destination floor from below. When the elevator is a distance h from its destination, it accelerates with
a = −0.77 m/s2,
where the negative sign indicates a downward vertical direction. ("Up" is positive.) Find h.

a man walks across a linoleum floor. he was a weight of 250 pounds, and the soles of his shoes have a surface area of 37.20 in^2. what force in newtons and pressure in pascals will he exert on the floor as he walks across the floor?

You throw a baseball directly upward at time=0 at an initial speed of 14.5 m/s. what is the maximum height the ball reaches above where it leaves your hand?

a boy sitting on a swing at a maximum height of 5m above the ground.when the swing passes through the mean position which is 2m above the ground its velocity is?

sally travels by car from one city to other.she drives for 30.0 min at 80,0 km/h,120 min at 150 km/h ,and 45.0 min at 40.0 km/h and she speeds 15.0 min eating lunch and buying gas.
a:determine the avrage speed for the trip.
b:determine the total distance traveled.