Blog

When t = 12 s, the force sensor loses contact with the block, which continues to move along the horizontal surface. When t = 20 s, the block encounters a rough area and comes to rest in 25 cm. Recreate the velocity-time graph below, and sketch a graph of the speed of the block as a function of time.

Two spheres of uniform density are located a distance L apart, as shown in the figure above. The left sphere has a mass M1, and the right sphere has a mass M2. The center of mass of the two spheres is labeled point P. Which of the following is a correct expression for the distance from point P to the center of the left sphere?

A 2 kg block is initially at rest on a horizontal frictionless table. A force of 15 N is then exerted on the block at an angle of 37° to the horizontal, as shown above. The magnitude of the force exerted on the block by the table is most nearly:

Which of the following is a defining symptom of anorexia?

Explain how the students could use the graph to estimate the impulse exerted on the block.  

A motorcycle starts from rest and achieves a speed of 60 m/s in 4 seconds. Find its average acceleration. 

A 3 kg mass at rest on the floor is attached to a string which goes vertically to a pulley. A weight is attached to the other end of the string and released. If the 3 kg mass rises 50 cm in 1 s, find is the value of the other mass.

The worries of people with generalized anxiety disorder

If the heritability of ADHD is about 0.70, then

The Rat Park studies of the 1970s changed our understanding of addiction by showing that