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(a) Where should the pivot be placed so that the board is balanced, ignoring the board's mass? (b) Find the pivot point if the board is uniform and has a mass of 15 kg.
We estimate that there are 255 million plug-in electric clocks in the United States, approximately one clock for each person. The clocks convert energy at the average rate of 8.1 W.
A 4.8-kg block slides down an inclined plane that makes an angle of 25° with the horizontal. Starting from rest, the block slides a distance of 2.1 m in 4.8 s. Find the coefficient of kinetic fr
When a test charge q0 = 7 nC is placed at the origin, it experiences a force of 8 x 10-4 N in the positive y direction. (a) What is the electric field at the origin? answer in (N/C j)
A hollow sphere of radius 0.40 m, with rotational inertia I = 0.020 kg m2 about a line through its center of mass, rolls without slipping up a surface inclined at '> to the horizontal. At a certai
A point charge of -1.5 µC is located at the origin. A second point charge of 14 µC is at x = 1 m, y = 0.5 m. Find the x and y coordinates of the position at which an electron would be in
Three charges, each of magnitude 3 nC, are at separate corners of a square of edge length 1 cm. The two charges at opposite corners are positive, and the other charge is negative. Find the force exe
1) why does a blue object look blue in white light? Why do black objects appear black in white light?
Assume that the collision is perfectly elastic andthat the coefficient of kinetic friction between the block andshelf is 0.10. (a) What is the velocity of the lbock just after impact?
One particular asteroid has the following physical properties: Determine the momentum of the asteroid.
While exploring an ancient myan tomb, you discover that the walls are closing in on you. By exerting 400 N of force, you are able to keep the wall from coming closer. The work you are doing on the w
At a certain instant before the carts collide, the first cart's velocity is +3.1 m/s, and the second cart's velocity is -1.9 m/s. (a) What is the total momentum of the system of the two carts at thi
A magnetic field has a magnitude of 0.0647 T and is uniform over a circular surface whose radius is 0.249m. The field is oriented at angle of 22.9* with respect to the normal to the surface. What is
Using energy considerations, determine how far up the incline the block moves from its initial position before it stops (a) with no friction exerted (b) if the coefficient of kinetic friction is 0.4
The outer shell bears a total charge of +3Q; the (smaller) inner shell has a total charge of -Q. Assume that the charges are distributed uniformly over the surfaces.(a) Draw a diagram for this situa
When a test charge q0 = 3 nC is placed at the origin, it experiences a force of 8*10-4 N in the positive y direction. (a) What is the electric field at the origin?
Metal sphere in air: Breakdown field strength for air is roughly 3 X 106 N/C. If the electric field is greater than this value, stray free electrons (due to ionization of air molecules by cosmic rays
The electrons move with a velocity of 4.0 X 10^7 m/s. What electric field strength is needed to accelerate electrons from rest to this velocity in a distance of 5.0mm?
Sphere A is projected off the egde of a1.0m high bench with a horizontal velocity of 2.0 m/s. Sphere B is dropped from the the same height as sphere A. Both spheres have the same size and mass.
An elevator weighing 20,000 N is supported by a steel cable. What is the tension in the cable when the elevator is being accelerated downward at a rate of 3.0 m/s2?
A molecule of DNA (deoxyribonucleic acid) is 2.17 µm long. The ends of the molecule become singly ionized: negative on one end, positive on the other. The helical molecule acts like a spring a
If the salmon is able to jump vertically upward from the base of the fall, what is the maximum height of waterfall that the salmon can clear?
An electric dipole is formed from two charges, +/- q, spaced 1.00 cm apart. The dipole is at the origin, oriented along the y-axis, the electricfield strength at the point (x,y) = (0 cm, 10 cm) is 3
Released from rest at the same height, a can of frozen juice rolls to the bottom of the same hill. What is the translational speed of the frozen juice can when it reaches the bottom?
Calculate the kinetic energy that the earth has because of its rotation about its own axis. For comparison, the total energy used in the United States in one year is about 9.33 x 109 J.