The density of lead is greater than that of iron, and both are denser than water. Compared to a solid iron object of the same dimensions, the buoyant force acting on a solid lead object is be
1.greater.
2.equal.
3.less.
2
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Which of the following hypotheses for the origins of the Moon is generally accepted by astronomers?
A. The Moon is the result of a collision between Earth and a Mars-sized object in the early days of the solar system (the collision theory). B. The Moon formed somewhere else and was later captured by Earth (capture theory). C. The Moon formed alongside Earth (the twin theory). D. The Moon was originally a bulge on Earth that was flung off by the rapidly spinning Earth (fission theory).
Why does gravitational contraction halt in collapsing protostars?
What will be an ideal response?
The acceleration of a body cannot be zero at a point where
A. the average velocity is positive. B. the instantaneous velocity is zero. C. the instantaneous velocity is positive but decreasing. D. None of these choices are correct
A whistle produces sound of frequency of 1.00 kHz. If a listener moves with a speed of 30 m/s away from the whistle, what frequency does this person hear if the sound speed is 340 m/s?
A) 912 Hz B) 919 Hz C) 1000 Hz D) 1090 Hz