Classical Mechanics Answers

A 400kg mass on a 30 degree inclined plane is acted upon by a force equal to 4800N at an angle 30 degree with the incline as shown in the figure below.

The purpose of banking a curved road is [Best answer]

(A) to provide a force supporting the weight of

the car.

(B) to provide the centrifugal force.

(C) to provide the centripetal force.

(D) to provide the frictional force.

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 girl is standing at the edge of a cliff 100. m above the ground. She reaches out over the edge of the cliff and throws a rock straight upward

with a speed 8.00 m/s.

a) How long does it take the rock to hit the ground?

b) What is the speed of the rock the instant before it hits the ground?

I think the answers are:

a) 6.4s

b) 45.0m

Explain why the skater spins faster when she

closes her arms but she opens her arms to

stop spinning in figure skating.

In a large hollow cylinder, roller-coaster rider

can drive the car along the wall of the cylinder.

What minimum speed must be the car

without sliding downward?

For a given body, the moment of inertia is [

Best answer

(A) constant.

(B) independent on the mass.

(C) dependent on the location of the center of

rotation.

(D) dependent on the angular velocity.

A sports car must achieve a velocity of 100m/s after passing the entry tollgate of an expressway. If it can do this after traveling 1km, what must it's acceleration ve?

If a bike is moving with a uniform velocity of 4m/s determine its acceleration after 30 seconds

a student hold her psychology textbook, which has a mask of 1.5kg out of a second-story dormitory until her arm is tired. how much work is done to a book by the student kin simply holding it out of the window?