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
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What natural barrier tries to prevent two protons from combining?
A) Dark energy B) Antigravity C) Electromagnetic repulsion D) The weak nuclear force E) The strong nuclear force
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
Why are fossils of early life on Earth rarer than fossils of plants and animals from the past few hundred million years?
A) We find fossils in sedimentary layers, and no sediments were deposited until just a few hundred million years ago. B) Life was far less abundant prior to a few hundred million years ago. C) Early organisms were microscopic and lacked skeletons and other hard structures that are most likely to be fossilized. D) Fossils could not form before there was oxygen in the atmosphere.
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