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Rudiy27
3 years ago
12

During a science lesson on changes, Ms. Sloan's students made mixtures of sulfur (the yellow substance) and iron filings (the bl

ack substance. Ms. Sloan challenged her students to separate the two substances and one group easily completed the task by using a magnet to lift the iron filings from the mixture. Next, Ms. Sloan poured the same mixture into a test tube and heated it in the Bunsen burner flame. What was the result of heating the mixture?
Physics
1 answer:
kramer3 years ago
5 0

Answer:

Both substance will melt and become a solution.

Explanation:

When a mixture of iron filings (black substance) and sulphur powder (yellow substance) are heated in a test tube under a bunsen burner, usually they will undergo a chemical reaction where they will melt to form a new solution of ferrous sulphide.

Thus, we can say what happens is that both substances melt to form a solution.

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A child bounces a 48 g superball on the sidewalk. the velocity change of the superball is from 26 m/s downward to 17 m/s upward.
Nataly_w [17]
By definition we have the momentum is:
 P = m * v
 Where,
 m = mass
 v = speed
 Before the impact:
 P1 = (0.048) * (26) = 1.248 kg * m / s
 After the impact:
 P2 = (0.048) * (- 17) = -0.816 Kg * m / s.
 Then we have that deltaP is:
 deltaP = P2-P1
 deltaP = (- 0.816) - (1,248)
 deltaP = -2,064 kg * m / s.
 Then, by definition:
 deltaP = F * delta t
 Clearing F:
 F = (deltaP) / (delta t)
 Substituting the values
 F = (- 2.064) / (1/800) = - 1651.2N
 answer:
 the magnitude of the average force exerted on the superball by the sidewalk is 1651.2N
3 0
4 years ago
A steam turbine at an electric power plant delivers 4500 kW of power to an electrical generator that converts 95 percent of this
Anna11 [10]
<span>1.2 × 10^3 A 
is the answer</span>
7 0
3 years ago
Is chalk a colloid, suspension, element, compound, or a mixture
Fittoniya [83]
I think that chalk is a compound. it is made up of molecules containing one calcium atom ,one carbon atom and three oxygen atoms.
3 0
3 years ago
An African Swallow, flying with a horizontal velocity of 80 m/s due North, drops a coconut from a height of 8 m. When does the c
Vesnalui [34]

Answer:

The coconut hit the ground after 1.28 s

Explanation:

Velocity: This can be defined as the rate of change of displacement. Or it is defined as speed in a specified direction. Velocity is a vector quantity. The S.I unit of velocity is m/s.

Using the equation of motion,

S = ut + 1/2gt²....................................... Equation 1

Where S = distance, u = initial velocity, t = time, g = acceleration due to gravity

<em>Given: s= 8 m, u = 0 m/s ( because it was drop from a height), </em>

<em>Constant :   g = +9.8 m/s²</em>

<em>Substituting these values into equation 1,</em>

<em>8 = 0×t + 1/2(9.8×t²)</em>

<em>8 = 4.9t²</em>

<em>t² = 8/4.9</em>

<em>t = √1.63</em>

<em>t = 1.276 s</em>

t = 1.28 s

Therefore the coconut hit the ground after 1.28 s

6 0
3 years ago
A seaplane flies horizontally over the ocean at 50 meters/second. It releases a buoy, which lands after 21 seconds. What's the v
pochemuha
The motion of the buoy is a composition of two independent motions:
- a uniform motion on the horizontal axis, with constant speed vx=50 m/s
- an uniformly accelerated motion on the vertical axis, with constant acceleration g=9.81 m/s^2

Since we want to find the vertical displacement, we are only interested in the vertical motion.
The law of motion on the vertical direction is given by:
y(t)=h+v_{0y} t+ \frac{1}{2}gt^2
where
h is the initial height of the buoy
v_{0y} is the initial vertical velocity of the buoy, which is zero
t is the time

We know that the buoy lands after t=21 seconds, this means that the vertical position at t=21 s is y(21 s)=0. If we substitute these data into the equation, we can find the value of h, the initial height of the buoy:
0=h+ \frac{1}{2}gt^2
h= -\frac{1}{2}gt^2= -\frac{1}{2}(9.81 m/s^2)(21 s)^2=-2163 m
And this corresponds to the vertical displacement of the buoy.
7 0
3 years ago
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