Mechanics | Relativity Answers

A luxury ship can accommodate 1,000 passengers together with its crew. It has 20 life boat in case of an emergency. each life boat (raft) measures 3 m x 2.5 m x 60 cm. if each raft must accommodate 70 % only of its capacity, what should be the maximum height or depth of the raft be submerged into the sea water. How many 50 kg people can each life boat accommodate? can the 20 rafts be sufficient for the passengers and crew? if not, what should be the suggestion you can give? (assume all other relevant data were considered in the design of the life boats. density of sea water is 1.03 x3 kg/cubic m.)

A sagging floor is jacked up and a steel girder 3.03 m long whose cross-sectional area is 6.0 in square is put in place underneath. when a jack is removed, a sensitive gauge that the girder has been compressed by 0.020 cm. Find the load the girder is supporting. use metric system units.  

A 1,200 KG CONCRETE SLAB MEASURES 2m X 2m X 20 cm is delivered to a building under construction. Does it contain steel reinforcing steel bars?

ONE GRAM OF GODCAN BE BEATEN OUT INTO A FOIL 1.O M2 IN AREA. HOW MANY ATOMS THICK IS SUCH A FOIL? THE MASS OF GOLD ATOM IS 3.27 x 10 –25 KG , DENSITY OF GOLD 1.9 X 104 KG.

A 60.0 kg sprinter starting a 100.0 m dash accelerates at a rate of 3.0 m/s2. What is the force of the sprinter?

Two tugboats pull a disabled supertanker. Each tugboat exerts a constant force of 1.8×10⁶, one 14 degrees west of north and the other 14 degrees east of north, as they pull the supertanker 0.751km. Calculate:

A. The total force vector exerted on the supertanker by tugboats as they pull it towards the north.

B. The total work the tugboat do on the supertanker.

The animation in the simulation (linked below) is a simple depiction of the motion of an orange, which is treated as a particle. The simulation depicts two reference frames, which are labeled A and B. Run the animation now. The motion is from the perspective of an observer (perhaps named Alex) at rest in frame A. Two things are being observed from frame A: the orange, and frame B. Here are some ideas to keep in mind about the simulation:

For the default values of vBA,x=4 m/s and vBA,y=0, what are the values of xPA (the x coordinate of the orange (the particle) as observed by Alex in frame A) at t=0

 and at t=8 s?

A uniform ladder rests against a smooth wall so that it makes an angle of 60⁰ with the ground. The ladder is 10.0 m long and weighs 150 N. How far can a 250 N child go up the ladder before it gets slips?

The coefficient of friction between the ladder and the ground is 0.4.

The base of a mountain is at sea level where the gravitational field strength is 9.810N/kg. The value of the gravitational field strength at the top of the mountain is 9.790N/kg. Calculate the height of the mountain above the sea level.

A stationary ball drops from the bleachers and reaches the ground at 11m/s. What is the height of the bleachers? Round to the nearest whole number