Bob, of mass m, drops from a tree limb at the same time that Esther, also of mass m, begins her descent down a frictionless slide. If they both start at the same height above the ground, which of the following is true about their kinetic energies as they reach the ground?
1.Bob's kinetic energy is greater than Esther's.
2.Esther’s kinetic energy is greater than Bob's.
3.They have the same kinetic energy.
4.The answer depends on the shape of the slide.
3
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Newton's law of gravitational force is expressed as follows:
a. An object with no force on it moves in a straight line with constant velocity. b. An object with a force on it is accelerated in the direction of the force an amount inversely proportional to its mass and directly proportional to the size of the force. c. For every action there is an equal and opposite reaction. d. The force between two objects is directly proportional to the product of their masses and inversely proportional to the distance between them squared.
Astronomers can determine the mass of the Sun by applying Newton's modification of Kepler's Third law.
Answer the following statement true (T) or false (F)
In a simple, academic version of the scientific method, which of the following is the correct order of actions that scientists take in their studies?
What will be an ideal response?
X-rays are produced using a potential difference of V. The spectrum of wavelengths is found to contain
A. a single wavelength. B. all wavelengths from zero up to a maximum. C. all wavelengths from a minimum to a maximum. D. only discrete wavelengths.