The formula for the hydronium ion is ______________
A. H?
B. H?O?
C. H?O?
D. H?O?
H3O+
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A 60.0-kg mass person wishes to push a 120-kg mass box across a level floor
The coefficient of static friction between the person's shoes and the floor is 0.700. What is the maximum coefficient of static friction between the box and the floor such that the person can push horizontally on the box and cause it to start moving? A) 0.333 B) 0.500 C) 0.350 D) 0.667 E) 0.700
In the above model of an atom, if you were to draw an electron’s transition from the second excited state to the third excited state, what numbers would this correspond from/to? What kind of spectrum would be produced?
a. 3 to 4, absorption
b. 2 to 3, absorption
c. 3 to 4, emission
d. 2 to 3, emission
A child pulls a 3.00-kg sled across level ground at constant velocity with a light rope that makes an angle 30.0° above horizontal. The tension in the rope is 5.00 N. Assuming the acceleration of gravity is 9.81 m/s2, what is the coefficient of friction between the sled and the ground?
A) 0.161
B) 0.188
C) 0.0441
D) 0.0851
E) 0.103
What is an accretion disk?
A) a disk of hot gas swirling rapidly around a white dwarf, neutron star, or black hole B) any flattened disk in space, such as the disk of the Milky Way Galaxy C) a stream of gas flowing from one star to its binary companion star D) a disk of material found around every white dwarf in the Milky Way Galaxy