A proton and an alpha particle are moving perpendicular to a uniform magnetic field with the same speeds. If the velocity of the proton is at an angle of 20° with respect to the magnetic field direction, at what angle to the magnetic field direction would the alpha particle be moving if it experiences the same magnitude magnetic force as the proton? The alpha particle has 4 times the mass of the
proton and twice its charge.
a. 10° b. 62°
c. 43° d. 9.8°
d
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An ice skater has a moment of inertia of 5.0 kg ? m2 when her arms are outstretched, and at this time she is spinning at 3.0 rev/s. If she pulls in her arms and decreases her moment of inertia to 2.0 kg ? m2, how fast will she be spinning?
A) 7.5 rev/s B) 3.3 rev/s C) 10 rev/s D) 2.0 rev/s
How much heat is necessary to change 10 g of water at 30°C into steam at 100°C?
a. 0.07 kcal b. 0.7 kcal c. 6.1 kcal d. 0.67 kcal
When the first law of thermodynamics is applied to an ideal gas that is taken through an isothermal process
A. 
B. W = 0.
C. Q = 0.
D. none of the above.
An athlete participates in an interplanetary discus throw competition during an Olympiad that takes place on a planet where the free-fall acceleration is 9.7 m/s2
He throws the discus with an initial velocity of 20 m/s at an angle of 60° from the vertical. Neglecting air resistance and the height of the discus at the point of release, what is the range of the discus? A) 21 m B) 60 m C) 36 m D) 40 m E) 32 m