Classical Mechanics Answers

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

A car’s speed increases uniformly from 20.0 km/h to 60.0 km/h in 20.0 s.

a) If a block slides at a frictionless plane inclined at theta equal 30 ° what's the acceleration of the block

b) if the coefficient of static friction between the plane and block in part (a) is miu equals 0.4 at what angle will the block start sliding if is initially at rest

If your car has a mass of 894kg, how much force is required to accelerate it forward at 3.22m/s²?

Pedro pulls a 789 N sled along the ice using a rope that makes a 34.5-degree angle to the ground. If he pulls with a force of 123 N and moves the sled 12.3 m in 23.4 s what is Pedro’s power?