A 20-kg object is resting at the top of a table 1.3 m above ground level. The object is then picked up and moved to a height of 7.7 m above ground level. What is the change in the gravitational potential energy of this object?
Answer:
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In a certain one-lane road there are no entrances or exits. As the road passes through open country and populated areas, the speed limit changes. Assume that cars travel at the posted speed limit
In the open road, where the speed limit is 55 mph, the cars are spaced so there are 51 cars per mile. If the flow of cars is steady, how many cars per mile are there in a stretch of road where the speed limit is 40 mph? A) 56 cars/mile B) 60 cars/mile C) 66 cars/mile D) 70 cars/mile E) 76 cars/mile
The luminosity of a Seyfert galaxy varies with a regular period of months or years
a. True b. False Indicate whether the statement is true or false
A floating ice cube contains small pieces of iron. The water level after melting will
A) rise. B) fall. C) remain unchanged.
Compound A is a liquid and compound B is a solid. Which statement is justified?
a. Compound A is covalent; compound B is ionic. b. Compound A is ionic; compound B is covalent. c. Compound A could be ionic or covalent; compound B is ionic. d. Compound A is covalent; compound B could be ionic or covalent.