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ankoles [38]
3 years ago
10

HELP! A class is performing an experiment to keep an ice cube solid for as long as possible. which students actions could be a s

ource of error in this experiment?
A. Jody included a fan in her experiment, and Katie did not use a fan.
B. Maria wrapped the ice cube tightly in cotton and aluminum foil.
C. Jerrie used different sized ice cubes each time he repeated the experiment.
D. Carey measured the quickly melting cube every 5 minutes.
Physics
1 answer:
Goshia [24]3 years ago
5 0

Answer:

B. Maria wrapped the ice cube tightly in cotton and aluminum foil.

Explanation:

According to this question, a class is performing an experiment to keep an ice cube solid for as long as possible. However, in the experimental procedure that will be used to actualize this aim, certain protocols must be duly observed to avoid error in the experiment.

Among the listed options containing actions taken by students, wrapping the ice cube tightly in cotton and aluminum foil is a likely source of error to the experiment. This is because aluminum, owing to its metallic properties, is a good conductor of heat. Hence, Aluminum foil will conduct heat and cause the ice cube to melt faster than normal.

This will jeopardize the aim of the experiment, which is to keep an ice cube solid for as long as possible.

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lambda = 2t*(n2/n1)

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3 years ago
A rocket is launched and the observer measuring the rocket altitude is standing at a distance of 200 feet from the launcher. Whe
Gre4nikov [31]

Answer:

100 foot

Explanation:

Using the formula for calculating range to calculate the speed first as shown;

<h3>Range R = U²sin 2theta/g</h3>

U is the speed

theta is the observe angle

g is the acceleration due to gravity.

200 = U²sin 2(45)/9.8

Usin90 = 200 * 9.8

U² = 1960

U = √1960

U = 44.27 m/s

Get the required altitude

Altitude H = u²/2g

H = 44.27²/2(9.8)

H = 1,959.8329/19.6

<em>H = 99.99 feet</em>

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7 0
3 years ago
A uniform horizontal beam of weight 481 N and length 3.32 m has two weights hanging from it. One weight of 381 N is located 0.87
Andre45 [30]

Answer:

1143 N at 1.59 m from the left end

Explanation:

For the system to produce equilibrium, the total force and moment must be 0. Since the total weight downward is

481 + 381 + 281 = 1143 N

Therefore the magnitude of the force acting upward to balance this system must be the same of 1143 N

That alone is not enough, we also need the position of the force for the total moment to be 0.

Let x be the length from the this upward force to the left side. And let the left point be the point of reference for moment arm:

481 * 3.32/2 + 381 * 0.8798 + 281*(3.32 - 0.8798) - 1143*x = 0

x = (481*1.66 + 381 * 0.8798 + 281*2.4402)/1143 = 1.59m

5 0
4 years ago
A duck waddles 3 meters East and then 4 meters North. What is the magnitude and direction of his displacement?
Nadusha1986 [10]
East is our x axis 
north is out y axis                               N
                                                              |
                                                              |
                                                W _____|_______E
                                                              |
                                                              |
                                                              |
                                                              S
so he moves 3 m to the right and then 4 upwards

imagine what that looks like.......... a right angle triangle 

therefore we can use Pythagorean theorem  
 let the unknown side be x, which is the hypotenuse in this case

x^2 = 3^2 + 4^2 
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x = 5

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5 0
3 years ago
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