Who discovered the atomic nucleus in 1911?
a. Marie and Pierre Curie
b. Henri Becquerel
c. Ernest Rutherford
d. Niels Bohr
c
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A rectangle has a length of 1.323 m and a width of 4.16 m. Using significant figure rules, what is the area of this rectangle?
A. 5.50368 m2 B. 5.5037 m2 C. 5.504 m2 D. 5.50 m2 E. 5.5 m2
When you lift a 12. ounce beverage can from the table top to your mouth, you do approximately how much work?
A) 1 Calorie B) 1 Watt C) 1 Kw-h D) 1 Joule E) 1 erg
A company that produces pulsed gas heaters claims their efficiency is approximately 90%. If an engine operates between 250°C and 25°C, what is its maximum thermodynamic efficiency?
a. 83% b. 65% c. 43% d. 90% e. 56%
Newton's Second Law in 2 Dimensions: A 50.0-kg crate is being pulled along a horizontal smooth surface. The pulling force is 10.0 N and is directed 20.0° above the horizontal. What is the magnitude of the acceleration of the crate?
A. 0.0684 m/s2 B. 0.188 m/s2 C. 0.200 m/s2 D. 0.376 m/s2 E. 0.0728 m/s2