Suppose 39 g of reactant A is mixed with 40 g of reactant B. After a chemical reaction takes place between A and B, which statement is correct?
a. The total mass of products plus any unreacted reactants will be 79 g.
b. The total mass of products plus any unreacted reactants will be less than 79 g.
c. The total mass of products plus any unreacted reactants will be more than 79 g.
d. The total mass of products will be 79 g.
a
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An electron moves in a region where the magnetic field is uniform and has a magnitude of 80 ?T. The electron follows a helical path which has a pitch of 9.0 mm and a radius of 2.0 mm. What is the speed of this electron as it moves in this region?
A. 48 km/s B. 28 km/s C. 20 km/s D. 35 km/s E. 8.0 km/s
A bowling ball of mass 7.5 kg and diameter 18 cm rolls without slipping down a 10-m bowling lane with a constant speed 4.3 m/s
(a) Through what angle does the bowling ball turn as it travels the length of the lane? (b) What is the angular speed of the bowling ball? (c) Calculate the maximum radial acceleration that a point on the surface of the bowling ball could have. (d) Calculate the tangential acceleration of a point on the surface of the bowling ball.
Some people mistakenly call noon and midnight ______________ and ______________
Fill in the blank(s) with correct word
A sound source is placed in the center of a very wide and long room that has a low ceiling. Assume that the ceiling and floor are constructed of a material that absorbs the sound completely. In this situation, how would the intensity of the sound heard vary if a person moves from a distance of 10 meters from the source to a distance of 20 meters from the source?
1.The sound would have about ¼ the intensity 20 m from the source that it has 10 m from the source. 2.The sound would have about ½ the intensity 20 m from the source that it has 10 m from the source. 3.The sound would have about the same intensity 20 m from the source that it has 10 m from the source. 4.The sound would have about twice the intensity 20 m from the source that it has 10 m from the source.