block on table

A 5.46 kg block located on a horizontal floor is pulled by a cord that exerts a force F = 11.4 N at an angle theta = 17.0° above the horizontal, as shown in the figure. The coefficient of kinetic friction between the block and the floor is 0.08. What is the speed of the block 5.9 s after it starts moving?

Difficulty for finding a centroid

Here is the asking problem: Locate the centroid of the plane area shown(the plane area is a 2D body and not a 3D). I want to know how can I find the centroid of the area shown in blue, and not the white area with shaded line. If you would check your answer:X=321mm, Y =53.1mm

True or false questions about Earth's movement.

It is roughly 3000 miles from the east coast of the continental United States to the west coast. When it is 10:00 AM on the west coast, it is 1:00 PM on the east coast. Using this information, you will be asked to make some estimates. Which of the following estimates or statements are true? (Give ALL correct answers) For the purposes of this problem, consider the continental United States to be located approximately on the equator and remember that there are 24 hours in a day. A) The U.S. east-to-west coast distance represents about 1/8 of the Earth's circumference B) The speed of rotation of the Earth cannot be found from these data C) The radius of the Earth must be about 3000 ... click for more

True and false questions about mass and acceleration.

A small box of mass m is stacked on top of a large box of mass 3m. The interaction between the large box and the horizontal surface on which it slides is frictionless, but the interaction between the two boxes is NOT frictionless. The small box does not slide when a horizontal force F is applied to the large box. Which statements about the boxes are true? (Give ALL correct answers) A) The net force on box 3m is 3/4 F B) The force that causes the acceleration of box m is friction C) The acceleration of both boxes is the same D) If the force stops acting, the boxes will slow down E) The velocity of both boxes will be constant and non-zero

True or false questions regarded an inclined plane and acceleration.

A block of mass M is sliding down an inclined plane and is accelerating. Which of the following statements are true? (Give ALL correct answers) A) If the block's mass were halved, its acceleration would not change B) The acceleration of the block is dependent upon the angle of the inclined plane C) The frictional force must be less than the component of Mg down the plane D) The surface must have some friction because the block is accelerating E) The normal force of the plane is equal to the component of Mg perpendicular to the plane