All categories

3 years ago

How do you think the amount of a material affects its tendency to sink or float?

Physics

1 answer:

Viktor [21]3 years ago

6 0

Answer:

Things float when they are positively buoyant, or less dense than the fluid in which they are sitting. This does not mean that an object has to be lighter than the fluid, as in the case of a boat; objects just need to have a greater ratio of empty space to mass than the fluid.

Explanation:

pls mark as brainliest

You might be interested in

Many hot-water heating systems have a reservoir tank connected directly to the pipeline, so as to allow for expansion when the w

Andre45 [30]

Answer:

$108.306\times 10^{-6}m^3$

Explanation:

According to volume thermal expansion the expansion in volume due to temperature is given by $\Delta V=V_0\beta \Delta T$ here $\beta$ is coefficient of volume expansion

The volume of copper pipe before expansion is $V_0=\pi r^2L=3.14\times (9.20\times 10^{-3})^2\times 59.7=0.0158m^3$

Now the increase of copper pipe due to increase in temperature = $\Delta V_c=V_0\beta _c\Delta T=0.0158\times 51\times 10^{-6}\times (64.5-20.5)=35.6\times 10^{-6}m^3$

As $\beta$ for copper is $51\times 10^{-6}$

Now the increase of water due to increase in temperature = $\Delta V_w=V_0\beta _c\Delta T=0.0158\times 207\times 10^{-6}\times (64.5-20.5)=143.906\times 10^{-6}m^3$

As $\beta$ for water is $207\times 10^{-6}$

So the minimum volume of reservoir tank to hold the overflow of water = $\Delta V=\Delta V_w-\Delta V_c=143.906\times 10^{-6}-35.6\times 106{-6}=108.306\times 10^{-6}m^3$

3 0

3 years ago

A small ball is attached to one end of a spring that has an unstrained length of 0.169 m. The spring is held by the other end, a

Nadya [2.5K]

The ball moves around in circular motion. The centripetal force keeping it in circular motion is given by:

F = mv²/r

F = centripetal force, m = mass of ball, v = velocity of ball, r = radius of motion

The force the spring exerts on the ball is given by:

F = kΔx

F = spring force, k = spring constant, Δx = change of spring length

The spring provides the centripetal force that keeps the ball in circular motion, so set the spring force equal to the centripetal force:

kΔx = mv²/r

Let's do some algebra:

m/k = rΔx/v²

Now if we attach the same spring to the ceiling with the ball still fixed to one end and let the ball hang in static equilibrium, the spring force would balance the ball's weight:

kΔx' = mg

k = spring constant, Δx' = new change in spring length, m = mass, g = gravitational acceleration

Let's do some more algebra:

Δx' = gm/k

Substitute m/k with our previous result, rΔx/v²:

Δx' = grΔx/v²

Given values:

g = 9.81m/s²

r = 0.169m + 0.0131m = 0.1821m

Δx = 0.0131m

v = 3.15m/s

Plug in the values and solve for Δx':

Δx' = 9.81(0.1821)(0.0131)/3.15²

Δx' = 0.0024m

5 0

3 years ago

Critical reasoning: We also use simulation to understand how the software would behave in the event of potential collisions. Giv

jeka94

Using kinematic reasoning, the answers for the changes that can cause crashes are:

we can manipulate

The speed of the vehicles, especially that of the second car

he traffic light change time

Change some condition of the pavement after the first vehicle passes

Autonomous systems are systems that take a series of signals from the outside, analyze them and carry out actions according to how to handle them.

In that case you have two cars one behind the other at a short distance a traffic light with a yellow light is approaching.

Some parameters can be modified to cause the crash:

The car in front accelerates to pass the traffic light, but the traffic light changed to red, in this case if the car behind also accelerated, there may not be enough distance to stop and crash.

You can change the traffic light to green whereby the first car continues its speed, but the traffic light time changes very quickly to red, whereby the first car stops, but the car behind cannot stop.

The car behind accelerates to also pass the yellow light, but turns red and the first one crashes to a stop.

We change some condition of the pavement after the first vehicle passes, for example wetting the pavement, which decreases the coefficient of friction, consequently the second vehicle does not have time to stop.

We can appreciate that if there is not a good and fast communication between the two vehicles, it is easy for them to crash.

In conclusion, using kinematic reasoning, the answers for the changes that can test shocks are found:

The second vehicle increases speed and the first must brake sharply

Learn more about stopping distance here:

brainly.com/question/24254597

6 0

2 years ago

Provide any THREE types of financiei esitance that can be for

spayn [35]

Answer:

University Need-Based Scholarships.

Federal and State Grants and Scholarships.

Loan Assistance.

Academic Year Student Contribution: AYSC.

Student Employment.

Outside Scholarships.

doing tutors for class 5 below

working as a waitree

and doing small business

8 0

2 years ago

. There are fewer organisms at the highest trophic levels, because

Amiraneli [1.4K]

Answer:

Because there is less energy at higher trophic levels

Explanation:

In a food chain that shows the feeding levels of organisms in an ecosystem, energy decreases as you move from the lowest trophic level to the highest trophic level.
The lowest trophic level consists of producers which have the highest energy as they trap energy directly from the sunlight.
The energy is lost from one trophic level to the next up to the highest trophic level which has the lowest energy.
Therefore, organisms at the highest trophic level are fewer in number but large in size.

7 0

2 years ago