As shown in the diagram, you've just thrown a baseball toward Al at 100 km/hr, while he is moving away from you to the right at 90 km/hr. According to Al, what is the baseball doing?
A) traveling to the right at 10 km/hr
B) traveling to the right at 100 km/hr
C) staying stationary
D) traveling to the right at 190 km/hr
A) traveling to the right at 10 km/hr
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Energy Levels: In a transition from one vibrational state to another, a molecule emits a photon of wavelength 5.56 µm. What is the energy difference between these two states? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 0.223 eV B. 2.23 MeV C. 13.6 eV D. 13.6 MeV E. 0.223 MeV
An electron traveling toward the north with speed 4.0 × 105 m/s enters a region where the Earth's magnetic field has the magnitude 5.0 × 10-5 T and is directed downward at 45° below horizontal
What is the magnitude of the force that the Earth's magnetic field exerts on the electron? (e = 1.60 × 10-19 C) A) 2.3 × 10-18 N B) 3.2 × 10-18 N C) 2.3 × 10-19 N D) 3.2 × 10-19 N E) 2.3 × 10-20 N
Large sunspots are larger than our whole planet
Indicate whether the statement is true or false
A 1.30-m long gas column that is open at one end and closed at the other end has a fundamental resonant frequency 80.0 Hz. What is the speed of sound in this gas?
A) 104 m/s B) 61.5 m/s C) 26.0 m/s D) 246 m/s E) 416 m/s