Mechanics | Relativity Answers

Find an expression for the energy density in terms of stress and strain

what was the main conclusion made by the following philosophers 1 major idea for each aristotle , galileo , rene descartes , newton's first law of inertia

A plane with a speed of 75m/s is going to travel along a runway of 25km, If it makes an acceleration of 1.3(m/s)/s, will it use the runway safely? Justify your answer.

You are to drive to an interview in another town, at a distance of 310 km on an expressway. The interview is at 11:15 a.m. You plan to drive at 100 km/h, so you leave at 8:00 a.m. to allow some extra time. You drive at that speed for the first 120 km, but then construction work forces you to slow to 40.0 km/h for 43.0 km. What would be the least speed (in km/h) needed for the rest of the trip to arrive in time for the interview?

A cyclist accelerates from rest to 5 m/s in 10 seconds. Later, he travels at a constant speed for another 20 seconds before coming to a complete stop in 5 seconds. What is the total distance travelled by the cyclist?

1. A cyclist is riding on a road, at a uniform speed of 5 m/s for 2 hours. What is his acceleration?

A cheerleader lifts his 40
.
4 kg partner straight
up off the ground a distance of 0
.
727 m before
releasing her.
The acceleration of gravity is 9
.
8 m
/
s
2
.
If he does this 14 times, how much work has
he done

For the free-falling parachutist with linear drag, assume a first jumper is 80 kg and has a drag
coefficient of 12 kg/s. If a second jumper has a drag coefficient of 15 kg/s and a mass of 93 kg,
how long will it take the second jumper to reach the same velocity as the first jumper reached in 10 s?

Vector & Relative Motion: A pilot wishes to fly from City A to City B. City B is exactly due east from A. Her plane has an airspeed of 200km/h. If the wind blowing to the North at 50.0km/h:
a)Ehat Direction does she need to point her plane?
b)Whats her groundspeed?
c)how long will her flight be if A and B are 500km apart?

A man aims the target at 500 m with a
gun. If the velocity of bullet is 50 m/s.
Find the height from the target where
the man should aim.