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3 years ago

Study the scenario.

2 answers:

8 0

3N

This is because unbalanced opposite forces form a resultant force (as an object can’t move in 2 different directions) so the 4N to the right And 1N on the left form a resultant force as the smaller force is taken from the larger force 4N-1N to form a resultant force of 3N to the right.

1️⃣⬅️➡️4️⃣

➡️3️⃣

Margaret [11]3 years ago

3 0

Answer:

The net force acting on the car is 3 N.

(d) is correct option.

Explanation:

Given that,

Force = 4 N to the right

Friction force = 1 N to the left

We need to calculate the net force acting on the car

According to the question,

When a toy car is pushed across the floor with a force then the normal force applied to the right and the frictional force applied to the left on the car.

Then, the net force = normal force - frictional force

Using formula of net force

$F_{net}=F-F_{k}$

$F_{net}=4-1$

$F_{net}=3\ N$

Hence, The net force acting on the car is 3 N.

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On top of Mount Everest, the temperature is -19 ∘C in July. Being a physicist, you determine by how many degrees Celsius one nee

kondaur [170]

Answer:

254 °C

Explanation:

The average kinetic energy of gas molecules K = 3RT/2N where R = gas constant = 8.314 J/mol-K, N = avogadro's constant = 6.022 × 10²³ atoms/mol

T = temperature in Kelvin.

Let K be its average kinetic energy at t = -19°C = 273 + (-19) = 273 - 19 = 254 K = T. K = 3RT/2N = 3 × 8.314 J/mol-K × 254 K/(2 × 6.022 × 10²³ atoms/mol) = 5.26 × 10⁻²¹ J

When its average kinetic energy doubles, it becomes K₁ = 2K = 2 × 5.26 × 10⁻²¹ = 10.52 × 10⁻²¹ J at temperature T₂. So,

K₁ = 3RT₁/2N

T₁ = 2NK₁/3R

T₁ = 2 × 6.022 × 10²³ atoms/mol × 10.52 × 10⁻²¹ J/3 × 8.314 J/mol-K = 508 K

The temperature difference is thus ΔT = T₁ - T = 508 K - 254 K = 254 K.

Since temperature change in kelvin scale equals temperature change in Celsius scale ΔT = 254 °C

So, we need to change the temperature of the air by 254 °C to double its average kinetic energy.

3 0

3 years ago

What is the shortest path that the paper can take to return to Owen's desk? The paper cannot move diagonally.

Vera_Pavlovna [14]

Answer:

to jamal then luis then to eva then back to owen

8 0

3 years ago

Read 2 more answers

What is the amount of charge a capacitor can store per volt of potential difference?

sladkih [1.3K]

The amount of charge a capacitor can store per volt of potential difference is called the capacitance of the capacitor.

<h3>What is the capacitance?</h3>

The capacitance has to do with the amount of charge that is stored by a capacitor. We know that a capacitor is a device that can be used to store electric charges. We have in it, two capacitors separated by a dielectric material.

Hence, the amount of charge a capacitor can store per volt of potential difference is called the capacitance of the capacitor.

Learn more about capacitor:brainly.com/question/17176550

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4 0

2 years ago

Read 2 more answers

The legs of a weight lifter must ultimately support the weights he has lifted. A human tibia (shinbone) has a circular cross sec

Sergio039 [100]

Answer:

249003822308.05008 N

Explanation:

F = Force

$\sigma$ = Breaking stress of bone = 150 MPa

$d_2$ = Outer diameter = 3.6 cm

$d_1$ = Inner diameter = 2.3 cm

Area of the bone is assumed to be a hollow cylinder

$A=\dfrac{\pi}{4}(d_2^2-d_1^2)$

Stress is given by

$\sigma=\dfrac{F}{A}\\\Rightarrow F=\sigma A\\\Rightarrow F=\dfrac{150\times 10^6}{\dfrac{\pi}{4}(0.036^2-0.023^2)}\\\Rightarrow F=249003822308.05008\ N$

The maximum weight the person can lift without breaking his legs is 249003822308.05008 N

3 0

4 years ago

Consider two different rods. The greatest thermal conductivity will be in the rod with:

sergey [27]

Answer:

Options A and D are correct

Explanation:

The thermal conductivity of a metal is the property of a metal to allow heat flow through it. conductivity is higher in conductors and low in insulators. Thermal conductivity is high in metals due to the metallic bonds that exist in metals and the presence of free electrons within the metal which allow easy flow of heat from one atom to another.From the problem the rod which contains freer electrons will allow more heat to flow easily hence have a higher thermal conductivity.

Thermal conductivity has the formula below;

$k= \frac{QL}{AΔT}$

k is thermal conductivity,

A is cross sectional area

L is length of rod

Q is quantity of heat transferred to material.

ΔT is temperature change.

From the above equation we can see that thermal conductivity is inversely proportional to A and directly proportional to L. This mean the rod with less area will have a higher thermal conductivity and the rod with a higher length will have higher k. Hence option C i wrong and option D is correct.

For specific heat, its very much different from thermal conductivity. Specific heat is the ability of a material to hold heat while thermal conductivity is the ability of heat to flow through a material.

4 0

3 years ago