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 ...continues

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 statement ...continues

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 for ...continues

block with string

A 3.62 kg block located on a horizontal floor is pulled by a cord that exerts a force F = 10.6 N at an angle theta = 34.0° above the horizontal, as shown in the figure. The coefficient of kinetic friction between the block and the floor is 0.09. What is the speed of the block 3.1 s after it starts moving?

True or false questions regarding the acceleration of an elevator.

An object of mass m is hanging by a string from the roof of an elevator. We want to compare the tension in the string to the weight of the object under various conditions. Which statements are true? (Give ALL correct answers) A) If the elevator is moving upwards, but slowing down, the tension in the string is equal to the ob ...continues

Calculating the coefficient of friction in centripetal movement.

A car goes around a flat curve with a radius of 65m at a speed of 49 km/hr. What must be the minimum coefficient of friction between the tires and road for the car to make the turn without skidding?

string and stone

A stone of mass 6.00 kg is attached to a strong string and whirled in a vertical circle of radius 44 cm. At the exact top of the path, the tension in the string is 4.2 times the stone's weight. What is the speed of the stone at this position (top of its path)?

Planet Deneb

We call the acceleration due to gravity on the Earth's surface "g". The planet Deneb Prime has a mass of 280 times that of Earth and a radius of 6 times that of Earth. Compared to Earth, what is the acceleration due to gravity on Deneb Prime? Express your answer in g's. So if you compute a value for the gravitational acceleratio ...continues