A girl lifts a ball by means of a string attached to the ball. The string exerts a 30 newton force on the ball. The ball weighs 20 newtons and has a mass of 2 kilograms. The acceleration of the ball is
A) zero. B) 25 m/s2. C) 5 m/s2. D) 15 m/s2. E) 10 m/s2.
C
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What does surface gravity measure?
A. the gravitational acceleration at a planet's or star's surface B. the tendency of a planet's surface to collapse under gravity C. the attraction between the surfaces of two massive objects D. how fast an object needs to go to escape a planet's gravity
What is the energy of a photon that has the same wavelength as a 24 eV electron? (h = 6.63 × 10^-34 J×s, me = 9.11 × 10^-31 kg)
a. 24 eV c. 3.5 keV b. 14 × 10^-16 eV d. 5.0 keV
Magnification can be accomplished with a hologram when viewed with light that has a
A) longer wavelength than the original light. B) shorter wavelength than the original light. C) neither for holograms cannot be magnified.
Discuss the discovery of Seyfert galaxies and their observable properties
What will be an ideal response?