Physics Answers

How many kilograms can a 100 kilogram man lift with a class two lever if the

force arm is 5 feet long and the resultant arm is 1.5 feet long?

What volume of alcohol with the density 8.4*100 will have the same mass as 4.2m of petrol whose density is 7.2*100

A car moves around a bend of radius 20m with an acceleration of 12ms^-2. What is the maximum speed the car can attain without skidding?

A parol (Christmas lantern) made of bamboo sticks and covered in colored paper is hung on a string on a window. If the parol has a mass of 100 g, and is in equilibrium, what is the tension in the string?

A particle is oscillating with simple harmonic motion of amplitude 15cm and frequency 4 Hz.

Compute (i) the maximum values of acceleration and velocity, (ii) the acceleration and velocity when

the displacement is 9cm.

A metallic sphere of 10g is attached to a rubber cord of initial length 100cm and rotated in a horizontal plane uniformly in a rate of 10rev/sec. Find the length of the cord at the speed and the tension along it given that a force of 0.5N stretches the rubber cord by 1cm. Take G=9.81m/s2

A block of mass m1 is suspended vertically with a rope connected to a block of mass m2. The block of mass m2 is on a frictionless plane inclined at theta with respect to the horizontal. If m1=2kg, the acceleration of the block is 1.96 m/s^2 downward. If m1=1kg the acceleration of the block is 1.22 m/s^2 upwards. Determine theta (angle) and m2.

Two blocks of masses m1=3kg and m2=5kg connected by a rope of negligible mass and slide on a frictionless surface. A force of 10 N acts on m2 at a 20 degree angle to the horizontal. Find a) the acceleration of m1 as well as it's orientation b) the tension in the rope.

The diagram is similar to that in this linked image: http://gauss.vaniercollege.qc.ca/pwiki/images/a/aa/N_APP_EX_4.png

4. Angelo was choosing springs to use their door. He noticed that spring A was stiffer than spring B; that is ka> ka. Which spring will have more elastic potential energy stored if (a) they are compressed the same distance and (b) if the same force is applied on them?

2. The figure below shows the acceleration of a 10 kg package that is accelerated to a maximum acceleration of a. = 20 m/s2 . How much work did the force used to accelerate the package do in order to move it from 0 m to 8 m?