A 100-N force has a horizontal component of 80 N and a vertical component of 60 N. The force is exerted to a cart on a level frictionless floor. The cart starts from rest and moves 2.0 m horizontally along the floor due to this force
What is the cart's final kinetic energy? A) 200 J
B) 160 J
C) 120 J
D) zero
B
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Ptolemy formulated a(n) ____________________ model of the solar system to predict positions of the Sun, Moon, and planets
Fill in the blank(s) with correct word
The three lowest resonate frequencies of a system are 50 Hz, 150 Hz, and 250 Hz. The system could be
A. a tube of air closed at both ends. B. a tube of air open at one end. C. a tube of air open at both ends. D. a vibrating string with fixed ends.
Which main sequence stars have the lowest mass?
A) spectral type O B) spectral type M C) spectral type A D) spectral type G E) can't tell from information provided
What is the mean free path for the molecules in an ideal gas when the pressure is 100 kPa and the temperature is 300 K given that the collision cross-section for the molecules of that gas is 2.0 × 10-20 m2?
The Boltzmann constant is 1.38 × 10-23 J/K, Avogadro's number is 6.02 × 1023 molecules/mole, and the ideal gas constant is R = 8.314 J/mol ? K = 0.0821 L ? atm/mol ? K. A) 1.1 × 10-6 m B) 2.1 × 10-6 m C) 1.7 × 10-6 m D) 5.3 × 10-6 m E) 1.5 × 10-6 m