Question 13.5 pts
Doubling the radius of a sphere of multiplies its area by ______.
Group of answer choices
8 and its volume by 8
4 and its volume by 8
4 and its volume by 16
none of the above
Flag question: Question 2
Question 23.5 pts
Which is more dense?
Group of answer choices
a cup-full of fresh water
a lake-full of fresh water
both the same
need more information
Flag question: Question 3
Question 33.5 pts
The strength of a beam is most related to its _______.
Group of answer choices
cross section
length
both of these
Flag question: Question 4
Question 43.5 pts
Applying pressure involves both ______.
Group of answer choices
force and area
area and volume
force and volume
Flag question: Question 5
Question 53.5 pts
A metal block is suspended from a spring is lowered into water, and then raised to the surface. Any further attempt to raise it causes the spring to ______.
Group of answer choices
contract
stay the same
stretch
Flag question: Question 6
Question 63.5 pts
When holes are drilled through the walls of a water tank, water will come out with the greatest speed from the hole closest to ______.
Group of answer choices
the top of the tower
the middle of the tower
the bottom of the tower
all the same
Flag question: Question 7
Question 73.5 pts
Pascal's principle applies to ______.
Group of answer choices
gases
liquids
both of these
none of these
Flag question: Question 8
Question 83.5 pts
If two objects have the same weight density, then ______.
Group of answer choices
they are equal in weight
they have equal mass densities
they may have unequal mass densities
Flag question: Question 9
Question 93.5 pts
A tree log is thrown overboard from a raft that is floating in a pool, the water level of the pool, the water level of the pool ______.
Group of answer choices
rises
falls
remains unchanged
Flag question: Question 10
Question 103.5 pts
One cubic meter of air has a mass of ________.
Group of answer choices
2.00 kg
1.00 kg
1.25 kg
2.25 kg
Flag question: Question 11
Question 113.5 pts
The attraction between like substances is called _______.
Group of answer choices
depends on the substances
cohesion
adhesion
Flag question: Question 12
Question 123.5 pts
When a boat sails from saltwater to fresh water, it will float _______.
Group of answer choices
at the same water level
lower in the water
higher in the water
Flag question: Question 13
Question 133.5 pts
Doubling the radius of a cylinder multiplies its area by ______.
Group of answer choices
8 and its volume by 16
2 and its volume by 8
2 and its volume by 4
none of the above
Flag question: Question 14
Question 143.5 pts
Crystals, at the molecular level, are held together by ______.
Group of answer choices
amorphous forces
excess neutrons
electrical bonding forces
cohesive forces
Flag question: Question 15
Question 153.5 pts
The percentage of molecules in the air that make up the atmosphere below 6-km altitude?
Group of answer choices
50%
40%
20%
30%
more than 50%
Flag question: Question 16
Question 163.5 pts
When ice melts in a glass of cola, the cola level _________.
Group of answer choices
rises
remains the same
falls
Flag question: Question 17
Question 173.5 pts
An ice cube containing a piece of iron floats in bucket of water. When the ice cube melts, _______.
Group of answer choices
no change in water level occurs
water spills over
water level in the bucket drops
Flag question: Question 18
Question 183.5 pts
When a suction cup sticks to glass, it is ______.
Group of answer choices
pushed to glass by the atmosphere
pulled to glass by vacuum
both of these
neither of these
Flag question: Question 19
Question 193.5 pts
A block of wood and a block of iron, each of 10 kg when placed on a weighing scale. Which has greater mass if buoyancy is taken into account?
Group of answer choices
wood
iron
both have the same mass
need more information
Flag question: Question 20
Question 203.5 pts
A submerged object displaces its own ________.
Group of answer choices
volume of fluid
density of fluid
weight of fluid
all of the above
none of the above
Flag question: Spacer
Please show your full solution steps. First state what is given, then start with the symbolic equation, then show data entered into the equation, and then the final answer with proper units. Please write your steps vertically. You will not gain credit for showing only the answer.
Flag question: Question 21
Question 21 10 pts
A water bed is 2 meters on a side and 30 cm (0.3 m) deep.
a) Find the weight of the water bed.
b) Find the pressure the water bed exerts on the floor, in Pascals.
Flag question: Question 22
Question 22 10 pts
A rock of 1 kg weighs 10 Newtons when suspended by a scale in the air. When the rock is submerged in a container of water and suspended in the water, the scale reads 8 Newtons.
a) What is the buoyant force on the rock?
b) If the container of water weighs 20 N on a weighing scale, what is the reading when the rock is submerged into the water?
Flag question: Question 23
Question 23 10 pts
When submerging a 12-kg block of metal into a water tank, it displaces 2 L of water. What is the density of the metal?
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