Answer:
B) 6.6 cm
Explanation:
A hollow steel ball of diameter 3.0 m barely floats in water. What is the thickness of the wall of the ball? The density of iron is 7.87 g/cm3 and that of water is 1000 kg/m3. A) 37 cm B) 6.6 cm C) 79 cm D) 131 cm
density steel 7750 to 8050 kg/m³, use 7870
density of water at 20C = 0.998 g/cm³ = 998 kg/m³
Note, the overall density must be equal to that of water, 998 kg/m³
density is the ratio of mass of a body to its volume
volume = V = ⁴/₃πr³ = ⁴/₃π(1.5)³ = 14.14 m³
Mass = 998 kg/m³ x 14.14 m³ = 14109 kg
Density of steel = 7870 kg/m³ = 14109 kg / V
V = 1.79 m³
deduct 1.79 m³ from the total volume of 14.14 m³
Volume of shell is ⁴/₃πr1³ – ⁴/₃πr2³ = ⁴/₃π(r1³ – r2³) = 1.79
divide ⁴/₃π from both sides
r1³ – r2³ = 0.428 m³
r2³ = (1.5)³ - 0.428
r2 = 1.434
to get the thickness we say that
the radius of the hollow steel ball -the radius of the ball
Thickness is 1.5 – 1.434 = 0.066 m or 6.6 cm
A change in momentum
Newton's Third Law
The conservation of Momentum
2) moon
3) Kuiper Belt object
4) meteor
2. Which explanation of the solar system best fits the observations of the planets and how they orbit the sun?
1) A comet hit the sun and sent off fragments that became the planets.
2) The gravity of a large, massive star passing the sun ripped off blobs of material from it that formed the planets.
3) The planets formed at the center of a collapsing spinning cloud of gas and dust.
4) The sun and planets formed from a collapsing spinning cloud of gas and dust.
Answer:
1: C. Kuiper Belt object
2: D. The sun and planets formed from a collapsing spinning cloud of gas and dust.
Explanation:
I just took the test!!!
There are several potential sources of error that could explain differences between a predicted sound speed and the experimentally measured value. Some common sources of error include:
1. Instrumental Errors: Inaccuracies or limitations in the measurement instruments used to determine the sound speed. This could include issues with the calibration of the instruments, sensitivity limitations, or errors in reading the measurements.
2. Environmental Factors: Variations in temperature, humidity, and atmospheric conditions can affect the speed of sound. If these factors are not accounted for or if they fluctuate during the experiment, they can introduce errors in the measured value.
3. Experimental Setup: Mistakes or inaccuracies in the experimental setup can lead to discrepancies between predicted and measured values. This could involve errors in the positioning of the sound source and receiver, incorrect timing measurements, or improper alignment of the equipment.
4. Assumptions and Models: Simplifications or assumptions made in the theoretical prediction of sound speed can introduce errors. If the underlying physics or properties of the medium are not accurately accounted for, the predicted value may deviate from the experimental measurement.
5. Human Error: Errors or biases introduced by the experimenter during the measurement process, such as misinterpretation of data, incorrect calculations, or systematic errors in data collection or analysis.
It is important to identify and minimize these sources of error through careful experimental design, calibration, and repeated measurements. Additionally, conducting experiments in controlled conditions and using precise measurement techniques can help reduce uncertainties and improve the accuracy of the measured sound speed.
To know more about Human Error refer here
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b.A concave lens of focal length 50 cm
c.A convex lens of focal length 2 m
d.A concave lens of focal length 2 m
Answer:
b.
Explanation:
-vesign shows the lens is CONCAVE
f=1/power
less than
equal to
In a sound wave, the magnitude of the compression is ___ the magnitude of the rarefaction.
equal to
b. amps/division
c. seconds/division
d. ohms/divisionthe horizontal sweep of an oscilloscope is rated in seconds/division.
Answer:
Second division
Explanation: