What evidence is there for scientists to believe Uranus has some internal heat?
a. active volcanoes spewing methane gas and ash
b. convection in the fluid mantle driving the dynamo effect
c. a molten metallic core
d. craters on the surface that are small and filled by lava
e. a severe axis tilt leads to more absorption of heat from the Sun
b
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How has the chemical composition of the core of the Sun changed in the past 4.5 billion years? Are earthlings (if any) likely to freeze in another 4-5 billion years? Explain
What will be an ideal response?
The Crab Nebula and its pulsar were produced by a(n) ________ supernova
Fill in the blank(s) with correct word
Which of the following best represents the energy transformations occurring in a coal-fired power plant?
A) thermal ? chemical ? electric B) gravitational ? thermal ? electric C) chemical ? electric ? thermal D) chemical ? thermal ? electric E) electric ? thermal ? chemical
A stone is thrown with an initial speed of 15 m/s at an angle of 53° above the horizontal from the top of a 40-m building. If g = 9.8 m/s2 and air resistance is negligible, then what is the speed of the rock as it hits the ground?
a. 30 m/s c. 34 m/s b. 32 m/s d. 36 m/s