Fred swings around a 0.40 kg ball attached to a string at constant speed in an almost horizontal circle of radius 1.3 meters. If one revolution takes 1.4 s:
(a) What is the angular speed of the ball?
(b) What centripetal force is exerted on the ball?
(a) 4.5 rad/s
(b) 10. Newtons
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The electric resistance of a superconductor is
A) zero. B) infinite. C) usually lower than ordinary resistors. D) none of the above
A semiconductor has an energy gap of 2.5 eV. What is the longest wavelength light of those listed below that will promote valence electrons into the conduction band?
A) 450 nm B) 525 nm C) 600 nm D) 725 nm E) 350 nm
A 12.0 V battery is placed across a 4.00
resistor. If the current through the resistor is 2.80 A, what is the terminal voltage of the battery?
A. 12.0 V B. 12.8 V C. 11.6 V D. 11.2 V E. 9.6 V
Determine which of the following objects obey the equations of projectile motion developed in this chapter
i. A ball is thrown in an arbitrary direction. ii. A jet airplane crosses the sky with its engines thrusting the plane forward. iii. A rocket leaves the launch pad. iv. A rocket moving through the sky after its engines have failed. v. A stone is thrown underwater.
1.(i) and (v) only 2.(ii), (iii) and (iv) only 3.(i) and (iv) only 4.All of them obey the equations of projectile motion.