Mechanics | Relativity Answers

Given, Sketch, And Solution of the problem?

Four people are pushing a body with forces:

310N in the direction 045

280N in the direction 135

400N in the direction 80. Calculate sum of vertical and sum of horizontal component respectively.?

If an object is moving at 2 m/s towards a porcelain vase, do you

think it will have enough momentum to break the vase? Explain.

Pushing over the file cabinet to keep out the

zombies requires 1000 N of force. The cabinet

accelerates at 20 m/s

2

. What is the mass of the

cabinet?

The car screw Jack is used to lift a car whose weight is 8800N.The bar for rotating the jack is 0.21m long and pitch of the screw is 2 mm. Calculate the effort required to operate the screw Jack assuming 50% efficient. If the bar is rotated 10 times how far will the car be raised? Hence, calculate the work done in raising the car through this distance.

You drive 9 miles east then 9 miles north

The pitch of a jackscrew shown in figure 2 is 0.3 cm and has a lever arm of 60 cm length.

What force at the end of the lever arm will raise a load of 190 kg if the efficiency of the machine

is 12 %?

If a is equal to 1.2 ± 0.1cm, b=2.0 ± 0.2cm, c=1.05±0.05cm, calculate the following with the errors and standard errors

(i) ab/C³

(ii) ABC

(iii) C²a³/b²

A clock showing correct time when at a rest loses 1 hour when it is moving.what is velocity

If 5m3 of a certain oil weighs 4000 kg(f). Calculate the specific weight, mass density and specific gravity of this oil.