We know that any body more dense than water will sink in water. Why?
What will be an ideal response?
Answer: If a body is more dense than water, it will be heavier than an equal volume of water. This means the downward force of gravity will exceed the upward buoyant force that acts on it. Net force will be downward, hence the denser-than-water body sinks.
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The force a spring exerts on a body is a conservative force because
a. a spring always exerts a force opposite to the displacement of the body. b. a spring always exerts a force parallel to the displacement of the body. c. the work a spring does on a body is equal for compressions and extensions of equal magnitude. d. the work a spring does on a body is equal and opposite for compressions and extensions of equal magnitude. e. the net work a spring does on a body is zero when the body returns to its initial position.
Discuss advantages and disadvantages of using a large control volume.
What will be an ideal response?
Which of the following normally warms up fastest when heat is applied?
A) water B) iron C) glass D) wood E) all of the above
A planet is detected via the Doppler technique. The shape of the periodic velocity pattern tells us
A) the planet's size. B) the planet's mass. C) the planet's density. D) the orbital period of the planet. E) the orbital eccentricity of the planet.