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Q. A certain loudspeaker has a diameter of 45 cm. At what frequency will the wavelength of the sound it emits in air be equal to its diameter?
Q. A small block with a mass of 0.190 kg is attached to a cord passing through a hole in a frictionless, horizontal surface. The block is originally revolving at a distance of 0.50 m from the hole with a speed of 0.90 m/s. The cord is then pulled from below, shortening the radius of the circle in which the block revolves to 0.15 m. At this new distance, the speed of the block is observed to be 3.00 m/s.
What is the tension in the cord in the original situation when the block has speed v_0 = 0.90 m/s?
What is the tension in the cord in the final situation when the block has speed v_1 = 3.00 m/s?
How much work was done by the person who pulled on the cord?
suppose the radius of the ball is very small compared to other length scales in the problem. Take starting level as step 0, the next step down as step 1, and so on.
You (height of your eyes above the water, 1.75) are standing 2.00 from the edge of a 2.50--deep swimming pool. You notice that you can barely see your cell phone, that went missing a few minutes before, on the bottom of the pool.
Define proton-proton chain efficiently
What is magnitude of the electric field
A student of weight 665 N rides a steadily rotating Ferris wheel (the student sits upright). At the highest point, the magnitude of the normal force N on the student from seat is 566 N.
If you are in a car accident with an initial speed of 119 km/h and you are stopped by an airbag that inflates from the dashboard, over what distance should the airbag stop you for you to survive the crash.
A charge of 3.80 10-6 C is placed on a small conducting sphere that is located at the end of thin insulating rod whose length is 0.22 m. The rod rotates with an angular speed of ω = 156 rad/s about an axis that passes perpendicularly through its o..
A 30 gram mass is hanging from a spring whose unstretched length is 20 cm and whose spring constant is 2.5 N/m. In the list below are described 5 situations. In some of the situations, mass is at rest and remains at rest. In other situations, at the ..
If air resistance is negligible, using energy considerations alone, how fast must the ball be going after it falls 200 meters.
A disc of mass M and radius R is rolling purely without slipping with velocity V on a flat horizontal floor. When it hits a step in the floor of height R/2.what is the velocity of the center of mass of the disc just after impact.
Assuming the diver has inhaled a negligible amount of air from the tank, what is the temperature of the ocean water.
Old naval ships fired 13 kg cannon balls from a 210 kg cannon. It was very important to stop the recoil of the cannon, since otherwise the heavy cannon would go careening across the deck of the ship.
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