Ask question

Ask question

All categories

3 years ago

12

A girl scout is pulling her 30 kg wagon of cookies with a force of 60 N to right. Friction pulls back with a force of 15 N left.

What is net force on the wagon

1 answer:

andreyandreev [35.5K]3 years ago

8 0

Answer:

net force = 45 newton towards right

You might be interested in

Which measurements are equal to 321 decimeters? Check all that apply.

S_A_V [24]

32,100 Millimeters
3,210 Centimeters
3.21 Decameters

Hope It Helps

5 0

4 years ago

Read 2 more answers

Which units are used to measure both velocity and speed? choose three options.

PolarNik [594]

Ne demek istoyusun anlamadım

7 0

3 years ago

Read 2 more answers

A thermos bottle has two layers, a glass layer and a vacuum layer.

SIZIF [17.4K]

The vacuum layer is the better thermal insulator

Explanation:

Depending on how they conduct heat, materials can be classified into two types:

Thermal conductos: these are materials that are able to transfer heat efficiently. Examples of thermal conductors are metals in general: in fact, when you heat one side of a metal bar, the other end becomes hot very fast; this means that the heat has been transferred very quickly across the metal rod
Thermal insulators: these are materials that do not transfer heat well. In general, gases or rarefied substances are better insulators, because the particles are more spread apart, and therefore the heat (which is transferred by conduction through collisions between molecules) is transferred less efficiently, due to the large distance between the particles.

In this sense, vacuum is the best possible insulator. This is because vacuum contains no particles at all, so there cannot be transfer of heat by conduction (because there cannot be collisions between molecules), and therefore, vacuum is the best thermal insulator.

Learn more about heat:

brainly.com/question/3032746

brainly.com/question/4759369

#LearnwithBrainly

4 0

4 years ago

Captain Hook is ghting Peter Pan, and they are about to step onto a tightrope strung horizontally between two maststhat are 16 m

andreyandreev [35.5K]

Complete Question

Captain Hook is fighting Peter Pan, and they are about to step onto a tightrope strung horizontally between two masts that are 16 m apart. When Pan and Hook are standing exactly halfway between the masts, the rope makes a 3 anglewith the horizontal. The rope has a diameter of 0.02 m and a Youngs modulus of 35 GPa.

What is the combined mass,in kilograms, of Peter Pan and Captain Hook?

Answer:

Their combined mass is $m= 161.2kg$

Explanation:

A sketch that describes the question is shown on the first uploaded image

From the question we are told that

The distance apart is $d_A = 16m$

The angle the rope makes is $\theta = 3^o$

The diameter of the rope is $d = 0.02m$

The Young modulus is $Y = 35Pa$

From the diagram we see that the elongation of the rope can be mathematically evaluated as

$\Delta L = 2x - 16$

And applying SOHCATOH rule $x = \frac{8}{cos \theta}$

Substituting values

$x = \frac{8}{cos (3)}$

$= 8.01m$

And $\Delta L = \frac{16}{cos 3} -16$

$\Delta L = 0.02196m$

The Tension on the rope can be mathematically represented as

$T = Y A * \frac{\Delta L}{L}$

Where A is the area and is mathematically represented as

$A = \frac{\pi}{4} d^2$

Substituting values

$A = \frac{\pi}{4} (0.02)^2$

Now Substituting values into the formula for the tension on the rope

$T = (35*10^9) * \frac{\pi}{4} (0.02)^2 * \frac{(0.02196)}{16}$

$=15093.4 N$

From the diagram we can mathematically evaluate the the weight of peter and hook as

$W = 2T sin \theta$

Where $W = mg$

Now substituting this into the equation and making m the subject

$m = \frac{2Tsin \theta}{g}$

Substituting values

$m = \frac{2* 15093.4 sin(3)}{9.8}$

$m= 161.2kg$

Note SOHCATOH is

$Sin \theta = \frac{opposite}{hypotenuse}\\ Cos \theta = \frac{adjacent }{hypotenuse} \\Tan \theta = \frac{opposite}{adjacent}$

8 0

3 years ago

1. refers to all liquid fresh water located above ground.

AleksandrR [38]

Answer:

1- Surface water

2- Groundwater

3- Lake

4- River

5- Watershed/Catchment basin

6- Wetland

Explanation:

Surface water refers to all the water bodies that are present on the surface of the earth. This includes rivers, streams, ponds, lakes.

Groundwater refers to the subsurface flow of water. When precipitation occurs, the water percolates downward through the rocks in the region where the rocks are porous and permeable, and this water then becomes groundwater.

A lake is usually defined as a large water body that is comprised of nutrient minerals and has extensive areas of open water. The depth of the lakes from one place to another and some are so deep that sunlight cannot penetrate into the deeper zone and the plants cannot carry out the process of photosynthesis.

A river is defined as a water body that flows from a region of higher elevation to the region of lower elevation and it flows across the land surface and configures the landscape.

Catchment basin is usually defined as a large area in which the precipitation occurs and the waters are accumulated and flow downward and mix up with the river channel and streams.

Wetlands are usually defined as an ecosystem that is comprised of shallow standing water, and a sufficient amount of vegetation.

7 0

3 years ago