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olga55 [171]
3 years ago
6

Kate gathered three boxes of the same size made of different materials: glass, clear plastic, and aluminum painted black. She pl

aced them on a window sill i0n the sun for an hour and then measured the warmth of the air in each box. In this experiment, the types of box materials are a(n)
A. Independent Variable.

B. Constant

C. Control

D. Dependent Variable
Physics
2 answers:
skelet666 [1.2K]3 years ago
5 0
<span>D. Dependent Variable is what i think it is

</span>
tigry1 [53]3 years ago
4 0

Answer:A. Independent Variable.

Explanation:

The independent variable can be changed, altered and manipulated in an experiment. This is done to observe such a change over the dependent variable.

The three boxes of different materials is an example of independent variable. The effect of which can be observed on the warm air present in each box which is the example of dependent variable.

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Answer: If one bulb goes out the other bulbs stay lit.

If there is a break in one branch of the circuit, current can still flow through the other branches.

Explanation:

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An atom undergoes nuclear decay, but its atomic number is not changed.
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Answer:

A. Gamma decay

Explanation:

A form of nuclear decay in which the atomic number is unchanged is a gamma decay.

The atom has undergone a gamma decay.

In a gamma decay, no changes occur to the mass and atomic number of the substance.

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3 years ago
A stationary speed gun emits a microwave beam at 2.10*10^10Hz. It reflects off a car and returns 1030 Hz higher. What is the spe
KIM [24]

Answer: V = 15 m/s

Explanation:

As  stationary speed gun emits a microwave beam at 2.10*10^10Hz. It reflects off a car and returns 1030 Hz higher. The observed frequency the car will be experiencing will be addition of the two frequency. That is,

F = 2.1 × 10^10 + 1030 = 2.100000103×10^10Hz

Using doppler effect formula

F = C/ ( C - V) × f

Where

F = observed frequency

f = source frequency

C = speed of light = 3×10^8

V = speed of the car

Substitute all the parameters into the formula

2.100000103×10^10 = 3×10^8/(3×10^8 -V) × 2.1×10^10

2.100000103×10^10/2.1×10^10 = 3×108/(3×10^8 - V)

1.000000049 = 3×10^8/(3×10^8 - V)

Cross multiply

300000014.7 - 1.000000049V = 3×10^8

Collect the like terms

1.000000049V = 14.71429

Make V the subject of formula

V = 14.71429/1.000000049

V = 14.7 m/s

The speed of the car is 15 m/s approximately.

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How to convert to si and english using fraction style(picture is example)? 10 m/s to mph
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What kind of employment is regarded as national level employment?
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Answer:

In most cases, the sources of information for both levels are same as follows:

Verbal or personal contacts : This information is transferred through verbal method. ...

Different media: Media is one of the best sources of information in these days.

Explanation:

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