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3 years ago

a 62 kg wave boarder is being pulled by a boat with a force of 124N. What is the acceleration of the wave boarder

Social Studies

1 answer:

vfiekz [6]3 years ago

3 0

Answer:

$Acceleration = 2m/s^2$

Explanation:

Given

$Force = 124N$

$Mass = 62\ kg$

Required

Determine the acceleration

This will be calculated using force formula:

$Force = Mass * Acceleration$

Substitute values for Force and Mass

$124N = 62kg * Acceleration$

Divide both sides by 62kg

$Acceleration = \frac{124N}{62kg}$

$Acceleration = 2m/s^2$

Hence, the wave boarder accelerates at $2m/s^2$

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Which projection wasused by early sailors to navigate around the globe?

Kobotan [32]

Answer:

Mercator invented his map projection primarily for navigation. If you draw a straight line between two points on a map created using the Mercator projection, that line represents the direction you need to sail to travel between the two points. This type of route is called a rhumb line or loxodrome.

Explanation:

8 0

3 years ago

Consider that the capacitor is initially not charged and the voltage of the battery is 3.00 V. The switch is closed at ????????

EastWind [94]

Your question has some difficulties in symbols and variables to read. That's why I am re-writing (re-arranged) the Question's statement again which is:

Question:

For the R-C circuit shown in figure 1 on page 3, R= 100 ohms and C=1.00F.

A)What is the time constant of the R-C circuit?

B) consider that the capacitor is initially not charged and the voltage of the battery is 3.00 V. The switch is closed at t=0. Using the appropriate formulas, write down the voltage Vc(t) on the capacitor and the current I(t) in the circuit.

C) consider that the capacitor is initially fully charged to 3.00 V. The switch is open at t=0. Using the appropriate formulas, write down the voltage Vc(t) on the capacitor and current I(t) in the circuit.

Your Question is missing the figure as well, which is attached below, please find it in the attached file.

Answer:

Part.A

100 seconds

Part.B

Vc(t)=0V

I(t)=30mA

Part.C

Vc(t)=3.0V

I(t)=0A

Explanation:

Given Data:

Resistance=R=100 ohms

Capacitance=C=100F

Part.A: Time constant=T=?

Time constant:

Time required to charge the capacitor upto 63.23% of the applied voltage is called a Time constant.

As we know that time constant for the RC (circuit having only resistor and capacitor) is equal to product of resistance and capacitance

$T=R*C$

so $T=100*1$

$T=100seconds$

Part.B: Vc(t) and I(t)=? If switch is closed

Given Data:

Voltage of the battery=Vs=3.0V

Capacitor is not charged initially and switch is closed at t=0 means that the circuit will become short (because capacitor is charging) in which current I(t) exist and voltage Vc(t) is zero.

Short circuit:

The circuit in which current is maximum and voltage is zero.

Thus voltage on the capacitor is Vc(t)=0V

Now we can find I(t) as follow:

Thus, Applying Kirchoff's Law (sum of all voltages is zero) on the circuit in the figure attached below, we get

$V_{s}-V_{R}-V_{c}(t) =0$

putting values, we get

$3.0-I(t)*R-0=0$

$I(t)*100=3$

$I(t)=\frac{3}{100}$

Current in the circuit is $I(t)=0.03A\ OR\ 30mA$

Part.c: Vc(t) and I(t)=? if switch is opened

If switch is opened and capacitor is fully charged then the capacitor will act as a battery and will supply will voltage as it has stored the charge. The switch is open it means the circuit is open.

So current I(t) in the circuit is zero=0A

and voltage Vc(t) exist which can be found as:

Applying Kirchoff's law, we get

$V_{s} -V_{c}(t)=0 \\V_{R}\ does\ not\ exist\ because\ current\ in\ the\ circuit\ or\ through\ resistor\ is\ zero$

$V_{s}=V_{c}(t)$

thus voltage on the capacitor is $V_{c}(t)=3.0V$

6 0

3 years ago

"n memory research irrelevant tasks (like the maze task in the scenario) is often included between encoding and recall to: Group

Vanyuwa [196]

During memory research, "irrelevant tasks" (like the maze task in the scenario) is often included between encoding and recall in order to:

A. Time for memory consolidation.

According to the given question, we are asked to show the reason for the use of "irrelevant tasks" during memory research of subjects during encoding and recall.

As a result of this, we can see that memory research is the use of techniques and sequences to find out how the brain stores information and how such information can be immediately retrieved.

With this in mind, we can see that when there is encoding in the memory, the new information is stored and recall is used to bring this information and "irrelevant tasks" are used to give the brain time for memory consolidation.

Therefore, the correct answer is option A

Read more here:

brainly.com/question/14018619

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3 years ago

Dr. ross is looking to examine if the indicators that make up her measurement of romantic attraction are truly related to one an

Paladinen [302]

She is trying to examine internal validity. This type of validity provides evidence to support if there is a direct relation of cause and effect. Scientific studies have internal and external validity. As mentioned, internal validity demonstrates how well a research null hypothesis can be rejected, and the working hypothesis validated. External validity, on the other hand, allows the researcher to transpose his/her findings to the population.

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3 years ago

You and your friend are having a conversation about science. Your friend says "science is no better than any other way of knowin

Black_prince [1.1K]

Answer:

The first thing to do here is to accept that what the friend is saying, about science not always being one hundred percet accurate, of having to be updated and knowledge relearned because of constant new discoveries that may make a previous belief true and absolute, but that later was refuted due to new evidence and research, is true. There will always be doubt associated with scientific knowledge.

However, there is one thing that makes science an accurate, and very reliable way of gaining certain knowledge; not all. When it comes to matters that can be seen, measured, touched, or easily monitored with the senses, science provides the best way to knowing these matters because it has a series of already proven steps that lead to accurate aswers and results. This series of steps is what we know as the scientific method. This scientific method ensures that the steps taken during scientific research can be proven, re-tested, re-evaluated and verified. In essence, science does not claim to be the absolute truth, but be a way to find answers that provide a sense of security that the answers found are as accurate as possible.

8 0

3 years ago