Which of these statements about the poles of magnets is correct?
a. Like poles repel; unlike poles attract.
b. Like poles attract; unlike poles repel.
c. Unlike poles attract; like poles have no effect.
d. All poles repel.
e. All poles attract.
a
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A block slides down a frictionless inclined ramp
If the ramp angle is 17.0° above the horizontal and the length of the surface of the ramp is find the speed of the block as it reaches the bottom of the ramp, assuming it started sliding from rest at the top. Also assume no air resistance. A) 10.7 m/s B) 114 m/s C) 7.57 m/s D) 19.6 m/s
If life does indeed exist elsewhere in our solar system it will most likely take the form of
A) human beings B) plants C) birds D) microbes or other simple life
Two boxes are connected by a weightless cord running over a very light frictionless pulley as shown in the figure. Box A, of mass 8.0 kg, is initially at rest on the top of the table
The coefficient of kinetic friction between box A and the table is 0.10. Box B has a mass of 15.0 kg, and the system begins to move just after it is released. (a) Draw the free-body diagrams for each of the boxes, identifying all of the forces acting on each one. (b) Calculate the acceleration of each box. (c) What is the tension in the cord? What will be an ideal response?