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Darina [25.2K]
4 years ago
11

Michelle melted a compound in the lab and performed the same procedure five times. The chart below shows the time it took for th

e compound to melt during the five trials.
Trial Time (min:sec)
1 3:14
2 3:10
3 4:05
4 3:12
5 3:09

After reviewing her data, she realized that trial 3 was vastly different from the other four trial times. Which of the following reasons could explain the radical difference in melting time for trial 3?

A larger quantity of compound was used in trial 3.
The compound started at a lower temperature in trial 3.
The burner was not directly under the compound during trial 3.
all of these
Physics
1 answer:
RideAnS [48]4 years ago
5 0

Answer:

It is actually all of these

Explanation:

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How does current change for resistors in series? what is the equivalent resistance for resistors in series? answers?
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8 0
4 years ago
A sock stuck to the inside of the clothes dryer spins around the drum once every 2.0 s at a distance of 0.50 m from the center o
Rashid [163]

a) 1.57 m/s

The sock spins once every 2.0 seconds, so its period is

T = 2.0 s

Therefore, the angular velocity of the sock is

\omega=\frac{2\pi}{T}=\frac{2\pi}{2.0}=3.14 rad/s

The linear speed of the sock is given by

v=\omega r

where

\omega is the angular velocity

r = 0.50 m is the radius of the circular path of the sock

Substituting, we find:

v=(3.14)(0.50)=1.57 m/s

B) Faster

In this case, the drum is twice as wide, so the new radius of the circular path of the sock is twice the previous one:

r' = 2r = 1.00 m

At the same time, the drum spins at the same frequency as before, therefore the angular frequency as not changed:

\omega' = \omega = 3.14 rad/s

Therefore, the new linear speed would be:

v'=\omega' r' = \omega (2r)

And substituting,

v'=(3.14)(1.00)=3.14 rad/s = 2v

So, we see that the linear speed has doubled.

8 0
3 years ago
A flywheel flows from 250rpm to 150rpm in 4.2 seconds. How many revolutions occur during this time ​
Assoli18 [71]

Answer:

7revolutions

Explanation:

Given parameters:

Initial revolution  = 250rpm

Final revolution  = 150rpm

Time  = 4.2s

Unknown:

Number of revolutions that occur at this time = ?

Solution:

To solve this problem;

 let us find the change in revolution  = 250rpm - 150rpm  = 100rpm

Convert the time to seconds;

         60s makes 1 minute

        4.2s will make \frac{4.2}{60}   = 0.07min

So;

      The number of revolutions at this time  = 100rpm x 0.07min

         =   7revolutions

6 0
3 years ago
Help me please savior
kolbaska11 [484]

Answer:

-16°C

Explanation:

PV = nRT

V and n are constant.

P / T = P / T

(2 atm + 1 atm) / (266 K) = (1.9 atm + 1 atm) / T

T = 257.1 K

T = -16°C

7 0
3 years ago
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