d. A person has to run in the direction of the bus over some distance after getting down from a moving bus.Why? ​

The magnitude of the magnetic field inside the solenoid is 3.4×10^(-4) T.

To find the answer, we need to know about the magnetic field inside the solenoid.

I= 0.3 A

Thus, we can conclude that the magnitude of the magnetic field inside the solenoid is 3.4×10^(-4) T.

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Answer:

Work done  on the two cart system is 2 N-m

Explanation:

Work done is equal to the product of force and displacement

Work done =4N * (0.17 +0.33)

work done = 4N * 0.5

Work done = 2 N -m

Work done  on the two cart system is 2 N-m

Answer:

C = 1.01

Explanation:

Given that,

Mass, m = 75 kg

The terminal velocity of the mass, \(v_t=60\ m/s\)

Area of cross section, \(A=0.33\ m^2\)

We need to find the drag coefficient. At terminal velocity, the weight is balanced by the drag on the object. So,

Weight of the object = drag force

R = W

or

\(\dfrac{1}{2}\rho CAv_t^2=mg\)

Where

\(\rho\) is the density of air = 1.225 kg/m³

C is drag coefficient

So,

\(C=\dfrac{2mg}{\rho Av_t^2}\\\\C=\dfrac{2\times 75\times 9.8}{1.225\times 0.33\times (60)^2}\\\\C=1.01\)

So, the drag coefficient is 1.01.

The linear velocity in terms of the angular velocity is,

where,

The angular velocity in terms of the linear frequency is,

Thus, the linear velocity in terms of linear frequency is,

The linear velocity in terms of the displacement and time is,

The relation given in the first option is the expression for centripetal acceleration.

Thus, option a is the correct answer.

The bullet takes 0.0025 seconds to pass through the wooden plank of 5 cm thickness when it is traveling horizontally with an initial speed of 30 m/s and a final speed of 10 m/s.

The time taken by the bullet to pass through the wooden plank can be determined using the equation of motion for constant acceleration.

Given:
Initial speed (u) = 30 m/s

Final speed (v) = 10 m/s

Distance (s) = 5 cm = 0.05 m

To find the time taken (t), we need to calculate the acceleration (a) first. We can use the equation:

v² = u² + 2as

Rearranging the equation, we have:

a = (v² - u²) / (2s)

Substituting the given values:

a = (10² - 30²) / (2 * 0.05)

Simplifying the expression:

a = (-800) / (0.1)

a = -8000 m/s²

The negative sign indicates that the acceleration is in the opposite direction of the initial velocity.

Next, we can use the equation of motion:

v = u + at

Substituting the values:

10 = 30 + (-8000) * t

Simplifying the equation:

-8000t = -20

Dividing by -8000:

t = 20 / 8000
t = 0.0025 s

Therefore, the time taken by the bullet to pass through the wooden plank of 5 cm thickness is 0.0025 seconds.


To find the time taken by the bullet to pass through the wooden plank, we need to calculate the acceleration first using the equation of motion.

By rearranging the equation and substituting the given values, we can find the acceleration.

Then, using the equation of motion again, we can solve for time.

The negative sign in the acceleration indicates that it is in the opposite direction of the initial velocity.

The resulting time is 0.0025 seconds.

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Answer:

Momentum is equal to mass for velocity (p1=mv)

But momentum is also equal to Force for time of impact (p1=Ft). Hence the impact force is inversely proportional to the fall time and directly proportional to the mass and fall velocity : F=mv/t^2 or F=p1/t

If he slows down, v diminishes and F diminishes

Hence correct Answer is C

The statement that most of the moons of the jovian planets have the potato-like shapes of asteroids, but a few are large enough to be spherical in shape is true. Option A.

Many of the moons of the jovian planets are irregularly shaped and most of them have heavily cratered surfaces, similar to asteroids. However, some of the larger moons, such as the four Galilean moons of Jupiter and Saturn's Titan, are large enough to be rounded by their own gravity, resulting in a spherical shape.

All of the moons are airless and barren and most of them are made up of rock and metal, with a few exceptions. Even the largest of the moons are smaller than any of the planets or dwarf planets in our solar system. For example, Jupiter's largest moon Ganymede is only 5262 km in diameter, while the planet Neptune is 49528 km in diameter.

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Answer:

both an electric field and a magnetic field

Explanation:

The correct answer for the The last quarter phase of the moon is it crosses the meridian at sunrise .

A third quarter moon, or last quarter moon, rises around midnight and sets around noon. The Moon is nearly back to the point in its orbit where its dayside faces the Sun directly, and all we see from our vantage point is a thin curve.

The Last or Third Quarter is when we can see half of the Moon's illuminated portion and half of its shadow portion. This is why this phase is commonly referred to as Half Moon. We can only see half of the Moon because it is at a 90-degree angle to the Earth and Sun.

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A 2.6-kg silverware drawer does not slide readily. The owner gradually pulls with more and more force, and when the applied force reaches 5.8 N, the drawer suddenly opens, throwing all the utensils to the floor.The coefficient of static friction between the drawer and the cabinet is 0.227.

The coefficient of static friction between the drawer and the cabinet can be determined with the help of the following  Identify the given and required values Given values:

Mass of the drawer, m = 2.6 kg Applied force, F = 5.8 N

Required values: Coefficient of static friction, μs

Determine the force of static friction The force of static friction can be calculated using the formula:Ff = μsFn where Ff is the force of static friction, μs is the coefficient of static friction, and Fn is the normal force acting on the object.As the drawer is at rest before the force is applied, the normal force acting on the drawer is equal to its weight.W = mg where W is the weight of the drawer and g is the acceleration due to gravity.Substituting the values in the above equation, we get:

W = 2.6 kg × 9.8 m/s²

   = 25.48 N

The force of static friction can now be calculated as: Ff = 5.8 N

Calculate the coefficient of static friction Substituting the values in the formula:

Ff = μsFn we get:

5.8 N = μs × 25.48 Nμs

         = 5.8 N / 25.48 Nμs

         = 0.227

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Answer:

Shed

Explanation:

Snakes have to shed, or else their skin will become really crusty and flaky. Especially the ones that live in a desert. The sun destroys their skin, as it isn't as strong as ours.  

Answer:

True

Explanation:

The energy carried by a wave is proportional to its amplitude squared. The larger the strength of the electric and magnetic fields, the more work they can do and the greater the energy the electromagnetic wave carries. A wave's energy is proportional to its amplitude squared (E2 or B2).

Answer:

Explanation:

operantly conditioned; positively reinforced

Answer:

The valency of atoms can be determined by looking at the groups of the periodic table. Hope this helps!

Explanation:

Answer:

For temperatures between the freezing and boiling point of water, the heating curve is linear. Thus, we can use:

((200 * 90) + (100* 30))/300

Or: ((200 * 90)(temperature of first sample weighted by mass) + (100 * 30)(temperature of second sample weighted by mass) / (300)(total mass)

to find the final temperature.

100 can be factored out to get (2 * 90) + (1 * 30)) / 3

3 can be factored out every term: (2 * 30) + (1 * 10)

(The factoring out just makes mental math easier; if a calculator is available doing so is unnecessary.)

And then just work through the order of operations.

60 + 10

=70.

So in mathematics, which assumes a perfect world, you get 70.

Answer: I believe it’s location D. Or whichever is the location of slow crystallization.

Explanation: Slow crystallization of magma forms granite. Hope this helps. :)

Answer:

D

Explanation:

For each described liquid, determine the behavior of a hydrometer calibrated around the density of pure water  In a liquid less than water. In this case Option A is correct.

An hydrometer is what?

An hydrometer is a piece of equipment with graded lines that allow for the measurement of this fraction. uses a device known as a pressure gauge, which is a tubular structure that can float when submerged in a liquid and is closed at both ends. In 1790, he created the hydrometer, a device for determining the density of liquids.

A calibrated hydrometer is what?

A formal report is delivered along with calibrated hydrometers. Hydrometers can also be calibrated for particular applications. For instance, a saccharometer measures the thickness of sugar, a lactometer measures the thickness of milk, and an alcoholometer analyzes the density of alcohol.

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Answer:

ok

Explanation:

Acceleration is defined as the rate of change of velocity.

Acceleration = (Change in velocity) / time taken

Acceleration = (Final velocity - initial velocity) / time

As the object velocity changes by the same amount in each second, it means the acceleration is constant.

Answer:

A

Explanation:

According to Newton's second law, acceleration is directly proportional to the net force. As the acceleration increases (when mass is constant), the net force increases. This is represented in the following formula.

\(f = ma\)

\(a = \frac{f}{m} \)

a = acceleration

f = force

m = mass

A child swings her 40 cm (0.4 meter) long, straight arm around her shoulder joint at a 13 rad/s angular velocity. So, her hand is moving at 5.2 m/s every second.

angular velocity is the speed where an object rotates or revolves around an axis or alters the angle between two bodies. The angle between a line solely on a single body and a line on the other in the illustration serves as a representation of this displacement.

The angular velocity increases with increasing rotational angle over a certain period of time. Degrees per second (o/s), radians per second (rad/s), or revolutions per minute (rpm), if appropriate, are the units for angular velocity. An element of a vector is angular velocity.

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Answer:

The Refractive Index (RI) is defined as the ratio of the speed of light in a vacuum to its speed in the sample medium.

Formula:-

\(n = \displaystyle{ \frac{c}{v} }\)

Where,

c is the speed of light and v is the phase velocity of light.

As a woman holding her breath swims deeper and deeper beneath the water's surface, her density (mass per unit volume) increases. This is because water pressure increases with depth, causing compression of the air in the lungs, making the lungs and the woman's body more compact.

The decreased volume of the lungs and the increased pressure on the body cause an increase in the woman's density, making it easier for her to sink. Once the woman reaches a certain depth, she will no longer be able to sink because her buoyancy force is equal to her weight. At this point, she will stop sinking and start to float.

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I suggest that the students move forward with option A.

Test funnels of the same size and material with varying sized openings. This will allow them to determine the optimal size for the opening that will help direct the marble to the launch pad. Once they have determined the optimal size, they can move forward with constructing the funnel with that size opening.

Answer:

P = 1 / f = 1 / 16.7 = .06 sec      period of 1 revolution

Period of 1/3 revolution = .06 s / 3 = .02 sec

If the light flashes every .02 sec the fan will appear motionless

Answer :

Imma just put it in the explanation

Explanation:

Electric to sound : Radio

Chemical to thermal+radiant+sound+kinetic : Fireworks

Gravitational to kinetic+sound : Waterfall

Chemical to thermal+kinetic : Drinking water (not sure what last answer is called but its supposed to match the girl drinking water lol)

hope this helps

If a ball is given a push so that it has an initial velocity of 2 m/s down a certain inclined plane, then the distance it has rolled after t seconds is s = 2t + t². Then it takes 11 seconds for the velocity to reach 24 m/s. The correct option is D.

To find the time it takes for the velocity of the ball to reach 24 m/s, we need to solve for the time when the velocity function equals 24 m/s.

The velocity function is the derivative of the distance function, so we'll first find the derivative of the distance function s = 2t + t² with respect to time t:

ds/dt = d/dt(2t + t²)

ds/dt = 2 + 2t

Now we can set the velocity function equal to 24 m/s and solve for t:

2 + 2t = 24

Subtracting 2 from both sides:

2t = 22

Dividing both sides by 2:

t = 11

Therefore, it takes 11 seconds for the velocity to reach 24 m/s.

The correct answer is (d) 11 seconds.

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The maximum height reached by the brick above the ground is 20 ft. The time taken by the brick to reach the ground is 0 seconds. Free-fall motion (uniformly accelerated motion) after falling from a height of 20 feet. Further, the acceleration experienced by the free brick is equal to the acceleration due to gravity which is approximately 32ft/sec², downward.

Hence, we can write its acceleration as, a = g = 32ft/sec².

Here, u = 0 as the brick was not moving initially while it was at rest on the top of the load of bricks.

Now, the value of v(t) can be obtained by integrating the above expression w.r.t. time as shown below:v(t) = u + a.t = 0 + 32t = 32t ...(1)

The value of x(t) can be obtained by integrating the expression for v(t) w.r.t. time, i.e. t as shown below :x(t) = (1/2).a.t² + u.t + x₀ = (1/2).32t² + 0 + 20ft = 16t² + 20ft ...(2)

Here, x₀ = 20ft is the initial displacement of the brick above the ground.

Now, we can answer the questions as follows:

(a) Using  the following relation: v = u + a.t = 0 when the brick is at its highest point.

Hence, the time taken to reach this point can be obtained as follows:0 = u + a.t ⇒ t = (-u/a) = (0/32) sec = 0 secThis means that the brick reaches its maximum height at t = 0 sec, which is the initial moment.

Thus, the maximum height reached by the brick above the ground is, x(0) = 16.0² + 20 = 20 ft

(b) The time taken by the brick to reach the ground can be obtained by using the following relation: x(t) = 0.

Here, we are interested in finding the value of t.

Hence, we can substitute x(t) from equation (2) above and equate it to 0 to obtain the value of t as shown below:16t² + 20 = 0 ⇒ t² = -(20/16) sec².

This means that the brick doesn't take any finite time to reach the ground from its maximum height.

This is because it falls vertically downwards from a height of 20 ft under the action of gravity.

Thus, it reaches the ground at t = 0 sec only.

(c) The speed of the brick just before it hits the ground can be obtained by using the expression for v(t) from equation (1) above and substituting t = 0 sec (just before it hits the ground) as shown below:

v(0) = 32(0) = 0 ft/sec.

Hence, the speed of the brick just before it hits the ground is 0 ft/sec.

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Answer:

The pressure difference required between the two ends of the 1.6 km pipe section, with a diameter of 29 cm, to transport the oil at a rate of 650 cm^3/s, is approximately 0.398 Pa.

Explanation:

To calculate the pressure difference between the two ends of a pipe, we can use the Poiseuille's Law equation, which relates flow rate, viscosity, pipe length, diameter, and pressure difference.

The formula is as follows: ΔP = (8 * n * L * Q) / (π * r^4)

Where:

ΔP is the pressure difference,

n is the viscosity of the fluid,

L is the length of the pipe section,

Q is the flow rate,

and r is the radius of the pipe (half of the diameter).

Given:

L = 1.6 km = 1600 m (convert to meters)

Diameter = 29 cm

Radius (r) = 29 cm / 2 = 14.5 cm = 0.145 m (convert to meters)

Q = 650 cm^3/s = 650 * 10^-6 m^3/s (convert to cubic meters per second)

n = 0.20 Pa.s (viscosity)

p = 950 kg/m^3 (density)

ΔP = (8 * 0.20 * 1600 * 650 * 10^-6) / (π * (0.145)^4)

ΔP ≈ 0.398 Pa

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Explanation: (I think)

Plug your values into the momentum equation.

So m1= 63kg

m2 = 10 kg

V1 = 12 m/s

And then plug in your values and solve for your unknown (v2)