Question 1: Explain how stars are formed.​

Yes, the object is made of gold if  the yellow object has a mass of 57.9 g and its volume is 3 \(cm^{3}\).

Mass of object = 57.9 g

Volume of object = 3  \(cm^{3}\)

Also, given density of gold: 19.3 g/\(cm^{3}\)

We know that, Density = Mass/Volume

= 57.9/3

=19.3 g/\(cm^{3}\)

So we calculated the density from the given data in question.

As the density of gold and the given yellow object is same we can conclude that the object is made of Gold.

It is yellow too which is a property of gold and the density is same as well.

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Answer:

see explanation

Explanation:

beam balance

temperature degree celsius

newton meter per second

weight.

hope I was helpful to tou

Answer:

  2.38 mW

Explanation:

Power is work per unit time. Work is the product of force and distance. That means ...

  \(\text{power}=\dfrac{\text{force}\times\text{distance}}{\text{time}}=\text{force}\times\dfrac{\text{distance}}{\text{time}}\\\\\text{power}=\text{force}\times\text{velocity}\)

Using the given values of force and velocity, the tadpole's power output is ...

  P = (0.028 N)(0.085 m/s) = 0.00238 W = 2.38 mW

The tadpole's power output is about 2.38 mW.

Answer:

The square of orbital period is proportional to the cube of the semi-major axis.

Explanation:

I just took the quick check

Since the car masses are unknown, we are unable to calculate the numerical value of the x-component of Car A's tangential acceleration.

The energy that is held in any object or system as a function of its position or component arrangement is known as potential energy. The object or system is unaffected by external factors like air pressure or altitude. Kinetic energy, on the other hand, describes the power of moving particles within a system or an object.

They are being affected by the kinetic frictional force, which is caused by:

f = μk * N

Therefore,

fB = μk * N = μk * mB * g

Car C is at its highest point at the top of the hill, where the normal force acting on it is equal to the force of gravity. Therefore,

fC = μk * N = μk * mC * g

where mC is the mass of Car C.

For Car A, the x-component of the tangential acceleration is given by:

aA = (fB - fC) / mA

where mA is the mass of Car A.

We can substitute the following values and simplify by assuming that the mass of each of the three automobiles is the same:

aA = (μk * mB * g - μk * mC * g) / mA

aA = μk * g * (mB - mC) / mA

Since μk = 1.00 and g = 9.81 m/s², we can plug in the values and get:

aA = (mB - mC) * 9.81 / mA

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The total volume of the piece of wood is 1.33\(cm^3\).

To calculate the total volume of the piece of wood, we can use the principle of displacement.

1. First, we need to find the difference in volume between the two water levels. The initial volume is 17.7 \(cm^3\), and the final volume is 18.5 cm^3. The difference is 18.5 \(cm^3\) - 17.7 \(cm^3\) = 0.8 \(cm^3\).

2. Now, we need to find the volume of water displaced by the piece of wood. Since the relative density of the wood is 0.60, it means that the wood is 0.60 times denser than water.

3. The volume of water displaced by the wood is equal to the difference in volume divided by the relative density of the wood. So, the volume of water displaced is 0.8 cm^3 / 0.60 = 1.33 \(cm^3\).

4. Finally, the total volume of the piece of wood is equal to the volume of water displaced. Therefore, the total volume of the piece of wood is 1.33 \(cm^3\).

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Answer: C: Amount of Water

Explanation: Because we have the water cycle, the amount of water on the Earth has never changed, it just gets filtered and reused.

Answer: they move side to side

Explanation:

i took the test

Let the circumference of the circle be 10L.

A moves at 10L/2 = 5L per hour

B moves at 10L/5 = 2L per hour

Therefore it takes 10L/(5L+2L) = 10/7 hours

Following are the answers:

1. To calculate the pressure exerted by the water column on the surface of the mercury, we can use the formula:

Pressure = force/area

The force is the weight of the water column and the area is the cross-sectional area of the container.

The weight of the water column is given by the mass of the water times the acceleration due to gravity:

mass = density x volume

volume = area x height

So, mass = density x area x height = 1000 kg/m^3 x pi x (0.025 m)^2 x 0.25 m = 0.196 kg

Weight = mass x acceleration due to gravity =\(0.196 kg * 9.8 m/s^2\) = 1.92 N

The cross-sectional area of the container is pi x (0.025 m)^2 =\(0.196 m^2.\)

So, Pressure = force/area = \(1.92 N/0.196 m^2 = 9.79 N/m^2\) or 9.79 Pa

2. To calculate the density of the oil, we can use the formula:

density = mass/volume

Since the height of the oil column is 0.92 m and the cross-sectional area of the container is 0.196 m^2, the volume of the oil column is 0.196 m^2 x 0.92 m = 0.18012 m^3.

We do not know the mass of the oil, but we can calculate it using the pressure exerted by the oil column on the surface of the mercury:

Pressure = force/area = density x acceleration due to gravity x height

So, density = Pressure/ (acceleration due to gravity x height) = 9.79 N/m^2 / (9.8 m/s^2 x 0.92 m) = 1060 kg/m^3.

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The total force applied to the roller can be obtained as,

The work done by the gardner can be given as,

Substitute the known values,

Thus, the work done by the gardener is 1340.64 J.

Answer:c i think

Explanation: not sure

The hypothesis is, the thickness of transparent glass affects how much light passes through. Option A is correct.

A hypothesis is a proposed explanation or prediction for a phenomenon or observation that is based on limited evidence and subject to testing and validation through further investigation. It is an essential part of the scientific method, which involves developing a research question, making observations, and forming a hypothesis to explain the observed phenomenon.

The hypothesis should be testable, falsifiable, and based on evidence and reasoning. Testing the hypothesis involves designing experiments and collecting data, which can either support or refute the hypothesis. If the hypothesis is supported by the data, it may be further developed into a scientific theory, which is a widely accepted explanation of a natural phenomenon that has been extensively tested and validated. Option A is correct.

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a) A = 8.0 m South

Since the vector is directly along the South direction, there is no x component.

x component: 0 m

y component: -8.0 m (negative because it's southward)

Component form: A = (0, -8.0)

b) B = -15.0 m at 30° East of North

To find the components, we can use the following relationships:

x component: B_x = B * sin(θ)

y component: B_y = B * cos(θ)

B_x = -15.0 * sin(30°) = -15.0 * 0.5 = -7.5 m

B_y = -15.0 * cos(30°) = -15.0 * (sqrt(3)/2) ≈ -12.99 m

Component form: B ≈ (-7.5, -12.99)

c) C = 12.0 m at 25° South of West

x component: C_x = -C * cos(θ) (negative because it's westward)

y component: C_y = -C * sin(θ) (negative because it's southward)

C_x = -12.0 * cos(25°) ≈ -10.85 m

C_y = -12.0 * sin(25°) ≈ -5.16 m

Component form: C ≈ (-10.85, -5.16)

d) D = 10.0 m at 53° West of North

x component: D_x = -D * sin(θ) (negative because it's westward)

y component: D_y = D * cos(θ)

D_x = -10.0 * sin(53°) ≈ -8.0 m

D_y = 10.0 * cos(53°) ≈ 6.0 m

Component form: D ≈ (-8.0, 6.0)

Answer:

(b) Increases

Explanation:

The potential energy between two point charges is given as;

\(U = F*r = \frac{kq_1q_2}{r}\)

Where;

k is the coulomb's constant

q₁  ans q₂ are the two point charges

r is the distance between the two point charges

Since the two charges have opposite sign;

let q₁ be negative and q₂ be positive

Substitute in these charges we will have

\(U = \frac{k(-q_1)(q_2)}{r} \\\\U = - \frac{kq_1q_2}{r}\)

The negative sign in the above equation shows that as the distance between the two charges increases, the potential energy increases as well.

Therefore, as you move the point charges farther and farther apart, the potential energy of this system relative to infinity Increases.

Answer:

Check the explanation

Explanation:

Part A

F = CA

this drag force balances the weight = 6X 9.8

so

6X9.8 = 0.5 X A X0.5 X 1.2 X 532

A= 0.069 m2

Part B

here the sorce is moving and the observer is at rest

so f= f(- 1 - 1

f = 1.1X10 343 343 – 53

f' = 1.3 KHz

Part C:

given the intensity = 30 dB

we know that I dB = 10 log (I(W/m2))

so we get I (W/m2) = 1000

Part D : The catch

Given that U1 = 53 M1 = 6 kg

U2 =-10 M2=0.25

V1=V2

now conserving momentum

6 X 53 -0.25 X10 =(6+0.25)V

V= 50.48 m/sec

Answer: Hello! I believe you might have a condition known as Digital Eye Strain (DES). This is cause by too much screen time, poor posture, bad lighting and viewing distance.

Before you panic, this is not permanent. Here’s some ways to help prevent it :

• Put the screen 20-28 inches away, 4-5 in below eye level and adjust your brightness. (Make sure your screen isn’t too bright)

•Rest your eyes for 15 minutes every 2 hours.

•Try the 20-20-20 rule: look at an object 20 ft away for 20 seconds every 20 minutes.

Please rest your eyes more. If it doesn’t go away after a bit. Please book a appointment with your eye doctor to make sure everything’s alright :)

let me know if you have any questions! :)

The age of the rock is approximately 2.58 billion years.

The half-life of uranium-238 is approximately 4.47 billion years. This means that after 4.47 billion years, half of the original uranium-238 will have decayed into lead.

We can use this information to determine the age of a rock for which we have measured that 53% of the original uranium-238 remains.

If 53% of the original uranium-238 remains, then 47% has decayed into lead.

Since half of the original uranium-238 decays every 4.47 billion years, the ratio of remaining uranium-238 to original uranium-238 after t years is given by:

\((remaining uranium-238) / (original uranium-238) = 0.53 = e^(-t/4.47E9)\)

Solving for t, we get:

\(t = -4.47E9 * ln(0.53) = 2.58 billion years\)

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Answer:

c

Explanation:

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The tube-insulation interface temperature is 593.4°C.

Electrical insulating materials (EIMs), which are used in electric machines and apparatus, can be classified according to their temperature using the temperature index (TI), a typical measurement. In most cases, accelerated life testing lasting >7-8 months at accredited labs is used to acquire TI.

we can use the following equation,

q = 2πkL(T1 - T2) / [ln(r2/r1)]

where q = heat transfer rate per unit length

k = thermal conductivity

L = length of the cylinder

T1 = inside temperature of the tube

T2 = outside temperature of the insulation

r1 = inner radius of the tube

r2 = outer radius of the insulation.

we have to calculate the outer radius of the tube,

r1 = 1 cm

r2 = r1 + 3 cm = 4 cm

we can calculate the heat transfer rate per meter of length:

q = 2π(19 W/(m°C))(1 m)(600°C - T2) / [ln(0.04 m/0.01 m)]

We need to solve for T2,

T2 = 450.7 °C

So, the heat loss per meter of length is,

q = 2π(19 W/(m°C))(1 m)(600°C - 450.7°C) / [ln(0.04 m/0.01 m)]

q = 668.6 W/m

Now, we can calculate the tube-insulation interface temperature,

q = 2π(0.2 W/(m°C))(1 m)(T1 - T2) / [ln(0.06 m/0.04 m)]

we get:

T1 = 593.4 °C

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The magnitude of the boat’s resultant velocity with respect to the starting point is 6.0 m/s. Hence, option (3) is correct.

The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.

The velocity of the boat in  still water = 5 meters per second along east.

The velocity of stream =  3.3 meters per second along south.

Hence, the magnitude of the boat’s resultant velocity with respect to the starting point is = √(5² + 3.3²) m/s

=6.0 m/s.

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the acceleration of the cat is 5m/s square

Answer:

The acceleration of the object can be calculated using the formula:

a = v^2 / r

where v is the velocity of the object and r is the radius of the circular orbit.

Substituting the given values, we get:

a = (10 m/s)^2 / 10 m

a = 100 m/s^2

Therefore, the acceleration of the object is 100 m/s^2.

Answer:

Its C on edge

Explanation:

trust me

The kangaroo is in the air for approximately 0.667 seconds.

Velocity is defined as the displacement of the object in a given amount of time and is referred to as velocity.

A kangaroo with a vertical speed of 6.57 m/s may jump over an object 2.20 m high.

To find the time a kangaroo is in the air, we need to calculate the time it takes to reach the peak of its jump and then double that time (to account for both the ascent and descent).

We can use the formula for vertical motion under constant acceleration (g = 9.8 m/s²):

t = √(2h / g)

where h is the height of the jump (2.20 m) and g is the acceleration due to gravity (9.8 m/s²).

Plugging in the values, we get:

t = √(2 × 2.20 m / 9.8 m/s²)

t = √(0.447)

t ≈ 0.667 s

So the kangaroo is in the air for approximately 0.667 seconds.

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Answer:

19

Explanation:

I legit did this and it took 19.

Answer:

7.02 ohms

Explanation:

R = V / I