When an unstable Zr nucleus undergoes alpha decay, the nucleus formed is that of
a. Zr.
b. Mo.
c. Y.
d. Sr.
e. Nb.
d
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Less formally defined groupings of stars are called __________________
Fill in the blank(s) with correct word
A ball rolls off the edge of a table. The horizontal component of the ball's velocity remains constant during its entire trajectory because
A) the ball is not acted upon by any force. B) the net force acting on the ball is zero. C) the ball is not acted upon by a force in the horizontal direction. D) the ball is not acted upon by a force in the vertical direction. E) None of the other choices is correct.
Uranus never grew massive enough to capture large amounts of gas from the solar nebula as Jupiter and Saturn did, so it has much less hydrogen and helium
Indicate whether the statement is true or false
Charge in an Electric Field: An electron is initially moving to the right when it enters a uniform electric field directed upwards, as shown in the figure. Which trajectory (X, Y, Z, or W) will the electron follow in the field?
A. trajectory W B. trajectory X C. trajectory Y D. trajectory Z