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3 years ago

The direction of the buoyant force on an object placed in fluid is

Physics

1 answer:

NemiM [27]3 years ago

5 0

An upwards direction

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Classify each of the following as an observation, a law, or a theory. (a) All matter is made of tiny, indestructible particles c

jenyasd209 [6]

Answer: a) Theory

Explanation: “Dalton’s Atomic Theory”

b) When iron rusts in a container... is an Observation

c) The “Law”of Conservation of Mass

d) is an observation

5 0

3 years ago

3. What is the mass of a sample of alcohol (Specific heat = 2445 J/kg °C.) If it requires

trasher [3.6K]

Answer:

Q=mc∆tita.

4780J= m × 2445J/kg/°C × 5.43°C

4780J= m× 13276.35J/kg

m= 0.36Kg

7 0

3 years ago

Nicholas spends 20 minutes ironing shirts with his 1,800-watt iron. How many joules of energy were used

ivanzaharov [21]

Multiply the power (1,800 watts) by time (1,200 seconds) to get 2,160,000 joules (or 2.16 MJ)

7 0

3 years ago

Think of a sphere with many a star-

ycow [4]

Answer:

For it is a Globular Cluster

Explanation:

These Globular clusters are not considered to be a galaxies because they bond gravitationally to orbiting galaxies like the Milky Way and their masses are relatively small.

In globular clusters, the stars are closed together and they are like 70times closer to one another in their solar neighbourhood.

A globular cluster is a spherical collection of stars that orbits a galactic core. Globular clusters are very tightly bound by gravity, which gives them their spherical shapes, and relatively high stellar densities toward their centers.

3 0

3 years ago

A fire hose 5 centimeters in diameter is used to fill a 225-liter bucket. If it takes 15 seconds to fill the bucket, what is the

Vika [28.1K]

I believe you ask about speed at the end of the hose:

The volume of the bucket is 225 liters which is equal to 225 $dm^{3}$ .
$V=225dm^{3}$
Hose's cross section can be counted with the typical circle's area formula (with diameter instead of radius, that's why you've got a fraction):
$A=3,14*\frac{d^{2}}{4}}=0,19625dm^{2}$

$225dm^{3}$ are filled within 15 second.

As the bucket is being filled you can say that it's volume is the volume of the water that flowed out of the hose, then:
$V=A*h$
The speed of the water can be counted with equation:
$v=\frac{h}{t}$
After extracting h from the volume's equation you get:
$v=\frac{V}{A*t}$
When you count the fraction you get the answer:
$v=76,43\frac{dm}{s}=0,7643\frac{m}{s}$

4 0

3 years ago