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The ballistic pendulum is a device used to measure the speed of a projectile, such as a bullet. The projectile, of mass 5g, is fired into a large block (of wood or other material) of mass 1kg, which is suspended like a pendulum. As a result of the collision, the pendulum and projectile together swing up to a maximum height of 20cm, Figure below.
a) calculate the speed immediately after collision.
b) calculate the speed of the bullet before collision.
One of Saturn's moons has an orbital distance of 1.87 x 108 m. estimate a mass for the planet Saturn
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Four point charges have the same magnitude of 7.60 *10^-12 C and are fixed to the corners of a square that is 2.0 cm on a side. Determine the magnitude of the net electric field that exists at the center of the square
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