A 320-g air track cart traveling at 1.25 m/s suddenly collides elastically with a stationary 270-g cart. What is the speed of the 270-g cart just after the collision?
A) 0.678 m/s
B) 0.106 m/s
C) 1.36 m/s
D) 1.14 m/s
E) 2.72 m/s
C
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The speed of a 10-kHz sound wave in seawater is approximately 1500 m/s. What is its wavelength in sea water?
a. 5.0 cm b. 10 cm c. 15 cm d. 20 cm e. 29 cm
Measuring the amount of deuterium in the universe allows us to set a limit on
A) the density of ordinary (baryonic) matter the universe. B) the total amount of mass in the universe. C) the acceleration of the universe. D) the current age of the universe.
The ionization energy of the hydrogen atom is 13.6 eV. What is the energy of a photon emitted corresponding to a transition from the n = 5 to n = 3 state?
a. 0.97 eV b. 1.81 eV c. 3.40 eV d. 6.80 eV e. 0.24 eV
The first solenoid has 2 times the diameter, 2 times the number of turns, and 2 times the length of the second solenoid. Which solenoid has the greater inductance and by what factor?
a. the first solenoid by a factor of 8 c. the first solenoid by a factor of 16 b. the second solenoid by a factor of 8 d. the second solenoid by a factor of 32