Free problems arranged by topic
 Kinematics Dynamics Conservation laws Thermodynamics Waves Electricity Magnetism Optics Fluids and elasticity Ideal gas AC current

 Free problems: all problems
 Kinematics Dynamics Conservation laws Thermodynamics Waves Electricity Magnetism Optics Fluids and elasticity Ideal gas AC current

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Physics problems:dynamics

Part 6

Problem 51.

The moment of inertia of a 0.98-kg bicycle wheel rotating about its center is . What is the radius of this wheel, assuming the weight of the spokes can be ignored?

Solution

Problem 52.

A 35 kg crate undergoes a horizontal acceleration of  on a level surface when pulled by a 65.0 N force. What is the coefficient of kinetic friction between the crate and the surface?

Solution

Problem 53.

A block of mass 13.6 kg is sliding at an initial velocity of 4.65 m/s along horizontal surface to the right. The surface has a coefficient of kinetic friction of 0.254. How far will it slide before coming to rest?

Solution

Problem 54.

A 2.65 kg crate is held in static equilibrium on an incline of angle 35.0 degrees by a force F applied perpendicular to the incline. The coefficient of static friction between the crate and the incline is 0.255. Determine the minimum magnitude of F that keeps the crate in static equilibrium.

Solution

Problem 55.

What is the magnitude of the force needed to maintain the circular motion of a 45-kg cyclist riding a 40-kg bicycle at 12.5 m/s around a 35.0-m radius circular track.

Solution

Problem 56.

Two force  and  of magnitude 5N each, inclined to each other at 60 degrees, act on a body. Find the resultant force acting on the body.

Solution

Problem 57.

A passenger of mass m=72.2 kg stands on a platform  scale in an elevator cab.

(a)what does the scale read if the cab is stationary or moving upward with a constant speed of 0.50 m/s?

(b)what does the scale read if the cab accelerates downward at ?

Solution

Problem 58.

A box is placed on a roof with an angle of 35 degrees above the horizontal. In order that the box will not damage the roof tiles, the component of the box's gravitational force perpendicular to the roof cannot exceed 425 N. What is the maximum allowable weight of the box?

Solution

Problem 59.

A meter stick tied at its center carries two 10 g weights. Where should 50 g weight be placed if the first 10 g weight is 10 cm away from the fulcrum and the second weight is placed 30 cm away from the fulcrum

Solution

Problem 60.

Two forces acting at a point make angle of 100 degree and 65 degree respectively with their resultant which is 15 N in magnitude. What are the magnitudes of the two forces?

Solution

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