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A firecracker resting on a level street explodes into three pieces of equal mass. Immediately after the explosion, the first piece is moving north at 125 m/s, and the second piece is moving east at 75.0 m/sec. What is the velocity of the third piece immediately after the explosion?
A 250 g, 24-cm-diameter plastic disk is spun on an axle through its center by an electric motor. What torque must the motor supply to take the disk from 0 to 1600 rpm in 4.1 s
ocean waves with wavelength 1.2 m and period 1.5s are moving past a pier. a boy runs along the pier, in the direction opposite to the motion of the wave, at 3.5 m/s. how many wave crests pass the boy each second?
Light from a He-Ne laser of wavelength 633 nm passes through a circular aperture. It is observed on a screen 4.0 m behind the aperture. compute the diameter of the hole
A 3.0cm tall object is 50cm in front of a convex mirror that has a -20 cm focal length. Calculate the image position in cm behind the mirror
An object's moment of inertia is 2.00kgm2 . Its angular velocity is increasing at the rate of 3.80, What is the total torque on the object
The emissivity of tungsten is 0.350. A tungsten sphere with a radius of 1.19 is suspended within a large evacuated enclosure whose walls are at a temperature of 285.0 . What power input is needed to maintain the sphere at a temperature of 2500.0 i..
A test tube standing vertically in a test tube rack contains 2.2 cm of oil, What is the gauge pressure on the bottom of the tube
The electric potential at the center of a (5.00 cm radius) metallic sphere is zero volts. what is the voltage between the conductors
a closed Gaussian surface in the shape of a cube of edge length 2.03 m. What is the net charge (in Coulombs) contained by the cube
Water can hold 36 grams (g) of salt in every 100 milliliters (mL). The ocean contains 3.6 g of salt in every 100 mL. As a solution, which is seawater.
Kelli weighs 405 N, and she is sitting on the playground swing that hangs 0.43 m above the ground. Her mom pulls the swing back and releases it when the seat is 1.00 m above the ground. suppose that air resistance is negligible.
What is the speed of the bowl? The speed of sound is 340 meters per second.
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