At their closest approach, Venus and Earth are 4.20 × 1010 m apart. The mass of Venus is 4.87 × 1024 kg, the mass of Earth is 5.97 × 1024 kg, and G = 6.67 x 10-11 N•m2/kg2. What is the force exerted by Venus on Earth at that point?
A) 1.10 × 1018 N
B) 4.62 × 1028 N
C) 5.43 × 1026 N
D) 6.30 × 1020 N
E) 1.72 × 1019 N
A
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Velocity: A light-year is the distance that light travels in one year. The speed of light is 3.00 × 108 m/s. How many miles are there in one light-year? (1 mi = 1609 m, 1 y = 365 d)
A. 9.46 × 1012 mi B. 9.46 × 1015 mi C. 5.88 × 1012 mi D. 5.88 × 1015 mi
Which of the following has the most kinetic energy?
A) a 4-ton truck moving 20 km/hr B) a 3-ton truck moving 30 km/hr C) a 2-ton truck moving 40 km/hr D) a 1-ton truck moving 50 km/hr E) A, B, C, and D all have the same kinetic energy.
In different experimental trials, an electron, a proton, or a doubly charged oxygen atom (O--), is fired within a vacuum tube. The particle’s trajectory carries it through a point where the electric potential is 40.0 V and then through a point at a different potential. Rank each of the following cases according to the change in kinetic energy of the particle over this part of its flight from
the largest increase to the largest decrease in kinetic energy. In your ranking, display any cases of equality. (a) An electron moves from 40.0 V to 60.0 V. (b) An electron moves from 40.0 V to 20.0 V. (c) A proton moves from 40.0 V to 20.0 V. (d) A proton moves from 40.0 V to 10.0 V. (e) An O-- ion moves from 40.0 V to 60.0 V.
1.a > b > c > e > d 2.b > a = c > d > e 3.e > d > a = c > b 4.c > e > a = b > dWaves carry energy
Indicate whether the statement is true or false