An ion enters a mass spectrometer which has a 0.18 Tesla field perpendicular to an electric field of 1.6 kV/m and selects a velocity. The same magnetic field is then used to deflect the singly charged ion into a circular path of radius 12.5 cm
(a) What velocity was selected?
(b) What was the ion mass?
(a) 8.9 km/s
(b) 4.1 × 10-25 kg
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A 10.0 kg mass is attached to the end of a 2.00 m brass rod with a 1.00 mm diameter. If the tensile modulus of brass is 
then the period of the simple harmonic motion of the mass is
A. 0.175 sec. B. 0.105 sec. C. 0.133 sec. D. 0.145 sec. E. 0.167 sec.
Why don't we expect to find life on planets orbiting high-mass stars?
A) The lifetime of a high-mass star is too short. B) The stars are too hot to allow for life. C) Planets cannot have stable orbits around high-mass stars. D) The high-mass stars emit too much ultraviolet radiation.
What was the Cambrian explosion?
A) the impact of the meteor that led to mass extinction of the dinosaurs B) the initial spark of lightning that created the first life-form from amino acids C) the eruption of the volcano known as Cambria on the ancient supercontinent of Pangaea D) a dramatic diversification of life that began about 540 million years ago E) the largest mass extinction in Earth's history
A solid sphere of mass 1.5 kg and radius 15 cm rolls without slipping down a 35° incline that is 7.0 m long. Assume it started from rest. The moment of inertia of a sphere is given by I= (2/5)MR2
(a) Calculate the linear speed of the sphere when it reaches the bottom of the incline. (b) Determine the angular speed of the sphere at the bottom of the incline. (c) Does the linear speed depend on the radius or mass of the sphere? Does the angular speed depend on the radius or mass of the sphere?