A student holds a marble above a bucket of sand. He drops the marble into the sand from different heights. He removes the marble and records his observations. The tableshows the student's observations.
Sand and Marble Investigation
Trial Height Above Bucket (centimeters) Observations
1
5
very shallow pit in sand
2
15
deep pit in sand
Why does the marble in trial 2 make a deeper pit?
O A. The marble travels a longer distance, so it has less energy
OB. The marble is in the air longer, so it has more time to travel.
Ос
The marble is higher above the sand, so it takes longer to hit the sand.
D. The marble has more distance to build up speed, so it has more energy.

Classify the following soils according to the uscs classification system. provide appropriate uscs designations. a) this sample of well-graded gravel with sand was obtained from a large earthen dam in vancouver, canada. the sample has 73% fine to coarse sub-angular gravel, 25% fine to coarse sub-angular sand and 2% fines. the maximum size of the particles is 75 mm. the coefficient of curvature is 2.7, while the uniformity coefficient is 12.4. b) this dark brown and wet soil with a “strong organic odor” has 100% passing the no. 200 sieve. the liquid limit of the material is 32% when not dried and is 21% when oven-dried. the plastic index is 21% when not dried. c) this sand has 61% predominantly fine sand, 23% silty fines, and 16% fine sub-rounded gravel size. the maximum size is 20 mm. the liquid limit is 33% and the plastic limit is 27%. d) this soil has 74% fine to coarse sub-angular reddish sand and 26% organic and silty dark brown fines. the liquid limit is 37% when not dried and is 26% when oven dried. the plastic index is 6% when not dried.

Asystem containing an ideal gas at a constant pressure of 1.22×10^5 pa gains 2140 j of heat. during the process, the internal energy of the system increases by 2320 j. what is the change in volume of the gas?

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87