A 0.28-kg stone you throw rises 34.3 m in the air. The impulse the stone receives from your hand while being thrown is
A.
s, up.B.
s, down.C.
s, up.D.
s, down.E.
s, up.Answer: C
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With only two exceptions, if a nucleus contains fewer ______________ than ______________, it is unstable
a. protons; neutrons b. neutrons; protons c. protons; alpha particles d. protons; beta particles
Which one of the hydrogen atoms below is EMITTING light? The electron jumps from the
a. second energy level to first (most bound). b. third energy level to fourth. c. fourth energy level to fifth. d. second energy level to third. e. first energy level to second.
Which of the following is a real piece of evidence (from the New Horizons mission) pointing to recent or ongoing geological activity on Pluto?
A) surface regions that suggest glacial movement of frozen ices of nitrogen and methane B) surface regions that show evidence of flooding by liquid water C) crater rims showing evidence of erosion by rainfall D) several towering volcanoes discovered on its surface
The most common isotope of uranium is U-238, but the form used in nuclear bombs and nuclear power plants is U-235. Given that uranium has atomic number 92, how many neutrons are in each of these two isotopes?
What will be an ideal response?