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A block slides down a frictionless, inclined plain that makes a 30° angle with the horizontal. Find the acceleration of this block.
A propeller is modeled as five identical uniform rods extending radially from its axis. what is its rotational kinetic energy
A 1.80 MHz sound wave travels through a pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward sound receiver as the heart beats.
a diver runs horizontally with a speed of 1.2 m/s off a platform that is 5.0 m above the water. What is the speed just before striking the water
A 70 kg rock lies at the bottom of a lake. If the volume of the rock is 30,000 cm3, how much force is needed to lift it? The density of water is 1.0 g/cm3.
A mass sitting on a horizontal, frictionless surface is attached to one end of a spring; the other end is fixed to a wall. 3.2 Joule of work is required to compress the spring by 0.12 meter. Determine what the value of the mass
is any work done when moving a charge along a field line?a. yes the field does positive work when a positive charge
A rocket is launched vertically from rest; and it burns fuel at a constant rate of 136 kg/s. Exhaust gases are expelled with a speed of 5.25 x 10^3 m/s relative to the rocket. what is the magnitude of the thrust?
Please show steps: Hydraulic engineers in the United States often use, as a units of volume of water, What volume of water, in acre-feet, fell on the town
Three sticks are arranged to forma right triangle. if the lenghts of the sticks are .47m, .62m, and .78m, what are the angles of the triangle?
An electron drops from the L shell to the K shell and gives off an X-ray with a wavelength of 0.0205 nm. What is the atomic number of this atom?
A 23kg child eats a candy bar containing 230 kcal of chemical energy. If the conversion to mechanical energy was 100% efficient (and it isn't), how high a hill (in meters) can the child climb before needing another snack?
If a mass is hung from a spring (whose spring constant is 2 pounds per foot) stretches the spring 0.4 meters (m), What is the force on the spring in Newtons (N)?,
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