Two singly ionized isotopes, X and Y, of the same element move with the same speed perpendicular to a uniform magnetic field. Isotope X follows a path of radius 3.37 cm while isotope Y moves along a path 3.58 cm in radius. What is the ratio of the two isotope masses,

?



a.

0.941



b.

1.06



c.

0.886



d.

1.13



e.

Not enough information is given.

---

a

Physics & Space Science

Multiple-Object Accelerating Systems: Two boxes are connected to each other by a string as shown in the figure. The 10-N box slides without friction on the horizontal table surface. The pulley is ideal and the string has negligible mass. What is true about the tension T in the string?

A. T = 10 N B. T = 20 N C. T = 30 N D. T < 30 N E. T > 30 N

A sprinter named Ben has challenged a beam of light to a race in the 100-m dash. The race is held in a stadium full of spectators. At the start signal, a laser beam is turned on at the start line, pointed down the track. At the same instant, Ben bursts out of the starting blocks at 99% of the speed of light (0.99c). According to Ben, what happens?

A) The light beam moves out ahead of him at the full speed of light, winning the race easily. B) The light beam gradually pulls ahead of him and wins the race because it is going 1% of the speed of light faster than him. C) The light beam instantly finishes the race, before Ben even has a chance to start. D) Ben wins the race and becomes a hero.

What spectral class of star fits between a type G and a type M?

a. L b. K c. A d. F

A pendulum bob of mass m is set into motion in a circular path in a horizontal plane as shown in the figure. The square of the angular momentum of the bob about the vertical axis through the point P is

a.
m² gl³ sin⁴ ?/cos ?

b.
m² gl³ sin³ ?/cos ?

c.
m² gl³ sin² ?/cos ?

d.
m² gl³ sin ?/cos ?

e.
m² gl³ sin² ?