The Doppler technique can be used to measure the orbital period of a planet by
A) measuring the asymmetries in the velocity curve.
B) measuring the amount by which the starlight is reduced when the planet transits.
C) measuring the speed at which the star orbits the mutual center-of-mass of the star and planet.
D) measuring the time it takes for the star's line-of-sight velocity to cycle from peak to peak.
D
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Uncertainty Principle Using Energy and Time: An unstable particle produced in a high-energy collision is measured to have an energy of 483 MeV and an uncertainty in energy of 29 keV. Use the Heisenberg uncertainty principle to estimate the lifetime of this particle. (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19)
Fill in the blank(s) with the appropriate word(s).
A scalar quantity is defined as
A) a quantity that is specified by a numerical value only. B) a quantity that is specified by using both a numerical value and a direction.
A hoop with a mass of 2.75 kg is rolling without slipping along a horizontal surface with a speed of 4.5 m/s when it starts down a ramp that makes an angle of 25° below the horizontal
What is the rotational kinetic energy of the hoop after it has rolled 3.0 m down as measured along the surface of the ramp? A) 34 J B) 22 J C) 45 J D) 62 J E) This question cannot be answered without knowing the radius of the hoop.
A student wishes to build a telescope. She has available an eyepiece of focal length -5.0 cm. What focal length objective is needed to obtain a magnification of 10x?
What will be an ideal response?