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3 years ago

Select all that apply.

2 answers:

8 0

The true statements are

"Its temperature will rise until reaching 0°C."
And
"Its temperature will remain at 0°C until all the ice melts."

So, basically once the ice has reached 0°C we can conclude that the ice has probably fully melted. However the temperature has to stay there if we want the ice to melt.

We must remember that the melting point of ice is 0°C, and that Ice is completely melted at approximately 0°C so we must have those two statements true

klemol [59]3 years ago

4 0

Temperature will rise until reaching 0°C.

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It takes a car traveling at 18 m/s, 240 seconds to reach Chick-Fil-A from the school. Determine how far Chick-Fil-A is from the

777dan777 [17]

Answer:

The requested distance is 4320 meters

Explanation:

We can use the formula for velocity in this movement at constant velocity (v), which is defined as the quotient between the distance covered divided the time it took:

$v=\frac{distance}{time}$

Since we know the velocity and the time, we can solve for the distance:

$\neq v=\frac{distance}{time} \\18\,\frac{m}{s} = \frac{distance}{240\,\,s} \\distance=18\,*\,240\,\,m\\distance= 4320\,\,m$

8 0

3 years ago

A person of mass 80 kg stands at the center of a rotating merry-go-round platform of radius 3.5 m and moment of inertia 950 kg*m

Leya [2.2K]

Answer with Explanation:

We are given that

Mass of person,M=80 kg

Radius,r=3.5 m

Moment of inertia of merry,I= $950 kgm^2$

Angular velocity of platform= $\omega=0.85rad/s$

1.Law of conservation of angular momentum

$I\omega=I'\omega'$

Where $I'=950+80(3.5)^2$

Substitute the values

$950\times 0.85=(950+80(3.5)^2)\omega'$

$\omega'=\frac{950\times 0.85}{950+80(3.5)^2}=0.418rad/s$

Angular velocity when the person reaches the edge =0.418 rad/s

2.Rotational kinetic energy of the system before the person's walk

$K_i=\frac{1}{2}I\omega^2=\frac{1}{2}(950)(0.85)^2=343.2 J$

3.Rotational kinetic energy of the system after the person's walk

$K_f=\frac{1}{2}(950+80(3.5)^2)\times (0.418)^2$

$K_f=168.6 J$

3 0

3 years ago

Lenny loves physics and math. In which Energy career pathway would these interests be the most helpful?

vazorg [7]

Answer:

it is D

Explanation:

cause i took the test

3 0

4 years ago

Read 2 more answers

As temperature increases, the speed of sound: decreases increases remains the same

Verdich [7]

The answer is actually as temperature decreases the speed of sound decreases. "As temperature decreases, the speed of sound decreases. As pressure, or oceanic depth, increases, the speed of sound increases." - my book.

5 0

4 years ago

A wire of cross-sectional area 5.00 106 m2 has a resistance of 1.75 O. What is the resistance of a wire of the same material and

MakcuM [25]

Answer:

the resistance of the second wire is 1 ohm.

Explanation:

Given;

cross sectional area of the first wire, A₁ = 5.00 x 10⁶ m²

resistance of the first wire, R₁ = 1.75 ohms

cross sectional area of the second wire, A₂ = 8.75 x 10⁶ m²

resistance of the second wire, R₂ = ?

The resistance of a wire is given as;

R ∝ $\frac{L}{A}$

Since the length of the two wires is constant

R₁A₁ = R₂A₂

$R_2 = \frac{R_1A_1}{A_2} \\\\R_2 = \frac{1.75\ \times \ 5.00\times 10^6}{8.75\times 10^6} \\\\R_2 = 1 \ ohm$

Therefore, the resistance of the second wire is 1 ohm.

6 0

3 years ago