Which of the following is closest in mass to a white dwarf?
A) the Moon
B) Earth
C) Jupiter
D) the Sun
D) the Sun
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It was ________ in the Galactic disk that threw Herschel's model of the size and structure of the Galaxy off badly
Fill in the blank(s) with correct word
Two electrons (e1 and e2) and a proton (p) lie on a straight line, as shown. The directions of the force of e2 on e1, the force of p on e1, and the total force on e1, respectively, are: ______e1________e2________p
A) ?, ?, ? B) ?, ?, ? C) ?, ?, ? D) ?, ?, ? E) ?, ?, ?
Matter Waves: The electrons in a beam are moving at 18 m/s. (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s) (a) What is its de Broglie wavelength these electrons?(b) If the electron beam falls normally on a diffraction grating, what would have to be the spacing between slits in the grating to give a first-order maximum at an angle of 30° with the normal to the grating?
Fill in the blank(s) with the appropriate word(s).
If one were told the object's initial velocity then one could calculate the work done by using the equations for constant acceleration to find the distance traveled. When we say work is done by a force, we mean the force does
a. all the work c. negative work b. positive work d. zero work