Classical Mechanics Answers

A train is scheduled to travel with a velocity of 72 kmh-1 in a certain limit of its route. Due to renovation the

train had to travel 1km of the above limit with a velocity of 9 kmh-1.If the train travelled 1575m while

reducing velocity from 72 kmh-1to 9 kmh-1 and 3150m while increasing velocity from 9 kmh-1 to 72 km h-1

, how late will the train be?

Two forces F1 and F2 are acting on an object F1 =80N acting at bearing of 45° and F2 =60N acting S 45° W

Consider a fever thermometer that contains 0.01 cm³ of mercury, Find the diameter of the capillary if a 1 C° change corresponds to a level change of 0.5 cm . Assume the glass does noe expand.

How much work is done in lifting a 2-kg ball 0.5m high? Express your answer in a) joules and b) ergs.

Block A rests on top of block Bas shown in (Figure 1). The table is frictionless but there is friction (a horizontal force) between blocks A and B. Block B has mass 6.00 kg and block A has mass 2.00 kg. If the horizontal pull applied to block B equals 12.0 N, then block B has an acceleration of 1.80 m/s2

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A car of mass 1050 kg accelerates uniformly at 2.4 ms-2 from an initial speed of 10 ms-1. It travels a distance of 540 m before it reaches its top speed.

a. Calculate its top speed.

b. The total resistive force on the car at its top speed is 3000 N. What is the power of the engine in Watts?

c. Given that 1 horsepower = 745.7 Watts, what is the horsepower rating of the car engine (to two significant figures)?

d. What is the kinetic energy of the car at its top speed?

e. Please calculate its momentum.

A 3kg object travels in a uniform circle at a constant speed of 12m/s. The centripetal force acting on the object is 110 Newtons.

Calculate the time required for the the object to complete one full circle.

A 3kg object travels in a uniform circle at a constant speed of 12m/s. The centripetal force acting on the object is 110 Newtons.

Calculate the weight of the object

A bullet leaves the barrel of a gun at a speed or 320 m/s at an angle of 45 degrees above the horizontal. At the moment the bullet leaves the barrel, the acceleration of the bullet is:

A. 0

B. 320m/s to the right

C. 9.8m/s upward

D. 9.8m/s downward

Which of the following descriptions of an object is not equivalent to the others?

A.the object is at rest

B.The forces on the object are balanced

C. The velocity of the object is constant

D. The acceleration of the object is 0