You are the science officer on a visit to a distant solar system. Prior to landing on a planet you measure its diameter to be 1.8 × 107 m and its rotation period to be 22.3 hours
You have previously determined that the planet orbits 1.8 × 1011 m from its star with a period of 402 earth days. Once on the surface you find that the acceleration due to gravity is 59.7 m/s2. What are the mass of (a) the planet and (b) the star? (G = 6.67 × 10-11 N ? m2/kg2.)
A) (a) 7.2 kg × kg, (b) 2.9 kg × kg
B) (a) 1.3 kg × kg, (b) 2.9 kg × kg
C) (a) 7.2 kg × kg, (b) 1.7 kg × kg
D) (a) 1.3 kg × kg, (b) 1.7 kg × kg
Answer: A
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Two large equipotent surfaces are flat and parallel and separated by a relatively small distance compared to their size. One surface is at 25 V and the other is at 33 V. The surfaces are 1.25 cm apart. What is the direction of the electric field midway between the surfaces?
A. the field is parallel to the surfaces B. the field is perpendicular to the surfaces going from the 25 V surface to the 33 V surface C. the field is perpendicular to the surfaces going from the 33 V surface to the 25 V surface D. the field makes clockwise circles viewed from the 33 V surface E. the field makes clockwise circles viewed from the 25 V surface
A rectangular wire loop (length = 60 cm, width = 40 cm) lies completely within a perpendicular and uniform magnetic field of magnitude of 0.5 T. If the length of the loop starts increasing at a rate of 20 mm/s at time t = 0, while the width is decreasing at the same rate, what is the magnitude of the induced emf at time t = 4.0 s?
A. 6.8 mV B. 5.2 mV C. 3.6 mV D. 8.4 mV E. 10 mV
A true statement about the modern theory of light is that
A. light waves do not carry energy but photons can. B. light can behave like a wave or a particle depending on the situation. C. light can only behave like a particle in atoms. D. photons do not have a frequency.
The jovian planets in our solar system are ________
A) Jupiter, Saturn, Uranus, and Neptune B) Mercury, Venus, Earth, and Mars C) Io, Europa, Ganymede, and Callisto D) Pluto and Eris