Scientific notation is used in science because
a. it makes it easy to write big or small numbers.
b. all astronomical distances are expressed in metric units.
c. it makes conversions between units easy.
d. All of the other choices are correct.
a
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A particle (mass = 4.0 g, charge = 80 mC) moves in a region of space where the electric field is uniform and is given by Ex = ?2.5 N/C, Ey = Ez = 0 . If the velocity of the particle at t = 0 is given by vx = 80 m/s, vy = vz = 0, what is the speed of the particle at t = 2.0 s?
a. 40 m/s b. 20 m/s c. 60 m/s d. 80 m/s e. 180 m/s
Ideally, the wind direction is ______________ to isobars
Fill in the blank(s) with correct word
A galaxy is observed receding from Earth with a speed of 2800 km/s
If the Hubble constant is 22 km/s per million light-years, estimate how many years ago the light that we presently see from the galaxy actually left the galaxy. (c = 3.00 × 108 m/s, 1 ly = 9.461 × 1015 m, 1 y = 3.156 × 107 s) A) 1.4 × 107 y B) 4.2 × 107 y C) 4.2 × 108 y D) 4.2 × 106 y E) 1.3 × 108 y
A solid object is made of two materials, one material having density of 2000 kg/m3 and the other having density of 8000 kg/m3 . If the object contains equal volumes of the materials, what is its average density?
a. 3000 kg/m3 c. 5000 kg/m3 b. 3200 kg/m3 d. more information is needed