A 500-kg cannon fires a 4.0-kg projectile with a velocity of 500 m/s relative to the ground. What is the recoil speed of the cannon?

A) 1.0 m/s
B) 2.0 m/s
C) 4.0 m/s
D) 6.0 m/s
E) 8.0 m/s


C

Physics & Space Science

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Why are fossils of early life on Earth rarer than fossils of plants and animals from the past few hundred million years?

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A proton moves through a small box that is isolated from all external influences and that has no matter inside it other than the single proton

Which of the following would we expect to find at some other point X [away from the proton] inside the box? A) a magnetic field B) an electric field C) Both of the above. D) an electric force E) no fields or forces of any kind

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What natural barrier tries to prevent two protons from combining?

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Physics & Space Science

An object of mass m is moving on a horizontal rough surface. At a certain point it has a speed v m/s and it comes to a stop after traveling 32 m

If the coefficient of friction between the object and the surface is 0.40, what is the value of speed v? Use g = 10 m/s2. A) 16 m/s B) 26 m/s C) 32 m/s D) 38 m/s E) 10 m/s

Physics & Space Science