Answer:
porosity = 0.07 or 7%
dry bulk density = 3.25g/cm3]
water content =
Explanation:
bulk density = dry Mass / volume of sample
dry mass = 0.490kg = 490g
volume = πr2h = 3.142 * 2 *2 *12 = 150.8cm3
density = 490/150.8 = 3.25g/cm3
porosity = 
= 
= 0.07 or 7%
water content = 
= 7%
Complete Question
The cars of a roller-coaster ride have a speed of 19.0 km/h as they pass over the top of the circular track. Neglect any friction and calculate their speed v when they reach the horizontal bottom position. At the top position, the radius of the circular path of their mass centers is 21 m, and all six cars have the same mass.V = -18 m What is v?X km/h
Answer:
Explanation:
Velocity 
Radius 
initial velocity u
Generally the equation for Angle is mathematically given by
Generally
Height of mass
Generally the equation for Work Energy is mathematically given by
Therefore
Write a statement that assigns freeBooks the appropriate value based on the values of the boolean variable isPremiumCustomer and the int variable nbooksPurchased is described below
Explanation:
Online Book Merchants offers premium customers 1 free book with every purchase of 5 or more books and offers 2 free books with every purchase of 8 or more books. It offers regular customers 1 free book with every purchase of 7 or more books, and offers 2 free books with every purchase of 12 or more books.
A statement that assigns freeBooks the appropriate value based on the values of the boolean variable isPremiumCustomer and the int variable nbooksPurchased. Here's what we have:
if(isPremiumCustomer = true){
if(nbooksPurchased >= 5));
freeBooks = 1;
}else if(nbooksPurchased >= 8){
freeBooks = 2;
}else {
if(nbooksPurchased >= 7);
freeBooks = 1;
}else if(nbooksPurchased >= 12){
freeBooks = 2;
}
We are getting an error of "illegal start of expression".
Two of the hints are "You are using an incorrect number somewhere in your solution" and "We think you might want to consider using: ==".
I do not want the answer, I just want pointed in the right direction.
