Mechanics | Relativity Answers

1. The coefficient of friction between a block and the floor is 0.35. If a force of 20 N acting
35 degrees above the horizontal gives the block a constant velocity. Find the mass of the block.
2. 2. A force of 180 N is required to slide a loaded box along a horizontal floor. If the
coefficient of friction between the box and the floor is 0.32, what is the mass of the
box?
3. 3. A 30-kg box is allowed to slide on an inclined plane 30 degrees with the horizontal. If the
coefficient of sliding friction is 0.80, what is the magnitude of the frictional force which
slows down the box’s motion down the slide?
4. A 60-N toolbox is dragged horizontally at constant speed by a rope making an angle of
35 degrees with the floor. The tension in the rope is 40 N. (a) Determine the magnitude of the
friction force and normal force. (b) What is the coefficient of friction?

Assuming that the earth momentum is at a distance 3.82*10^8m away from the centre of the earth, calculate it's linear speed and it's period of orbit motion round the earth.

A sail boat sails at a heading of 72 degrees with a velocity of 20.0 km/h. The boat sails in a current of 5.00 km/h at a heading of 25 degrees.
What is the actual velocity of the boat.

an airplane accelerates down a runway at 3.20m/s2 for 32.8s until id finally lifts off the ground. Determine the distance traveled before the takeoff.

Four masses are attached to a light stick at different positions. 3 kg is attached at 17 cm, 1.2 kg is attached at 39 cm, 2.4 kg is attached at 61 cm, and 1.3 kg is attached at 89 cm (all distances from the left end). Where will be the center of mass (from the left end, in cm)?

A Particle of mass m rests on a plane with no friction. The plane is raised to an inclination angle θ with a constant rate α (θ(t=0) = 0), causing the particle to slide down the plane. Determine the motion of the particle.

While her kid brother is on a wooden horse at the edge of a merry-go-round, Sheila rides her bicycle parallel to its edge. The wooden horses have a tangential speed of 6 m/s. Sheila rides at 4 m/s. The radius of the merry-go-round is 8 m.. At what time intervals does Sheila encounter her brother, if she rides in the direction of rotation of the merry-go-round?

if a wheel of 1.2m in diameter rotates at one revolution per seconds,calculate the velocity of the wheel?

how long will it take a 60kg man to climb a height of 22m if he expended energy at the rate of 0.25kw? [g=ms]

a rectangular block of dimension 2.0*1.0*0.5* weighs 200N calculate the maximum pressure exerted by the block on a horizontal floor