Is the gravitational force that the Earth exerts on you larger, smaller, or the same as the gravitational force that you exert on the Earth?
What will be an ideal response?
You and the Earth exert equal and opposite forces on each other.
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Two pistons push down on the fluid filling two cylinders connected by a narrow hose, as shown in the figure. The area A1 is 1 square inch, and the area A2 is 10 square inches. A force of 4 pounds is exerted downward on piston 1, as shown
 The pressure on A2 is __________.If h = Planck's constant, the frequency of light emitted when an atom makes a transition is equal to
A. the energy lost by the electron divided by h. B. the energy of revolution of the electron in its lowest energy orbit divided by h. C. the energy gained by the electron divided by h. D. the energy of revolution of the electron in its highest energy orbit divided by h.
The conditions required for a solar eclipse are
A) (1) the phase of the Moon must be new; (2) the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun. B) (1) the phase of the Moon must be full; (2) the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun. C) (1) the phase of the Moon can be either new or full; (2) the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun. D) (1) the phase of the Moon must be new; (2) the Moon must be located at the nearest point in its orbit around Earth. E) (1) the phase of the Moon must be full; (2) the Moon must be located at the nearest point in its orbit around Earth.
A car approaches you at a constant speed, sounding its horn, and you hear a frequency of 76 Hz. After the car goes by, you hear a frequency of 65 Hz. What is the frequency of the sound emitted by the horn? The speed of sound in air is 343 m/s
A) 68 Hz B) 69 Hz C) 70 Hz D) 71 Hz E) 72 Hz