The zirconium nucleus contains 40 protons, and an electron is 1.0 nm from the nucleus. What is the electric force exerted on the electron by the nucleus? ( e = 1.60 × 10-19 C, k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 2.9 nN
B) 1000 C
C) 3.7 nN
D) 6.8 nN
E) 9.2 nN
E
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Indicate whether the statement is true or false
A billiard ball traveling at 3.00 m/s collides perfectly elastically with an identical billiard ball initially at rest on the level table
The initially moving billiard ball deflects 30.0° from its original direction. What is the speed of the initially stationary billiard ball after the collision? A) 2.00 m/s B) 0.866 m/s C) 1.50 m/s D) 2.59 m/s E) 0.750 m/s
A square plate has an area of 29.00 cm2 at 20.0°C. It will be used in a low temperature experiment at T = 10.0K where it must have an area of 28.00 cm2. What area must be removed from the plate at 20.0°C for it to have the correct area at 10.0 K? (The coefficient of linear expansion is 10 × 10?6 (°C)?1.)
A. 0.079 3 cm2 B. 0.159 cm2 C. 0.238 cm2 D. 0.836 cm2 E. 0.921 cm2
At 22.0°C an aluminum ring has an inner diameter of 7.000 cm, and a brass rod has a diameter of 7.090 cm. Keeping the brass rod at 22.0°C, which of the following temperatures of the ring will allow the ring to just slip over the brass rod? (?Al = 2.4 × 10^?5 /C°, ?brass = 1.9 × 10^?5/C°)
a. 536°C b. 418°C c. 190°C d. 558°C e. 725°C