the magnitude of the gravitational force exerted on the block is fg , and the magnitude of the normal force exerted by the track on the block is fn . which of the following correctly compares the magnitudes of these two forces when the block is at the lowest point on the track? responses fn>fg f sub n is greater than f sub g fn

Jordan's take-off speed is 4.9 ms.

Key Accomplishments Too many to list. See the link below. Bottom line Jordan's incredible 4-foot vertical jump puts the top of his head 6 inches above the edge and the soles of his feet higher than any of his other NBA cleats. rice field. I also ran 4.3 Forty. Don't let anyone tell you that someone was a better athlete than you are. MJ was not only a great goalscorer back then, but he was also a high-flying dunker.

He has only one player in NBA history called his Airness and that is Michael He Jordan. He currently owns his NBA vertical jump of 48 inches, the highest in the entire tournament. That number comes with a hang time on the edge of 0.92 seconds. The 30th-40th percentile is 15-16 inches. Above-average vertical jump, values ​​are in the 60th and 70th percentiles and range from 18 to 19 inches. A good rating is 20-21 inches, which corresponds to the 80-90th percentile.

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Answer:

Explanation:

the SI base unit of mass length and time

mass =kg =kilogram

length=m=meter

time=s=second

Answer:

mass: kilogram length: metre time: seconds

Explanation:

Answer:

The resultant is the vector sum of two or more vectors. It is the result of adding two or more vectors together. If displacement vectors A, B, and C are added together, the result will be vector R. ... If two or more force vectors are added, then the result is a resultant force.

Explanation:

The crash would affect the motion of the satellite because a force acts on it. The direction and speed of the satellite are altered by the force applied by the crash. A greater change in motion was caused by the stronger crash of the two. A satellite's motion could be impacted if it collides with an asteroid.

The motion of the satellite after the crashes, such as speed and direction, would be influenced by the mass of the asteroid, the speed and mass of the satellite, and the speed and mass of the asteroid.To calculate the force of the collision, the equation F = ma is used, where F is force, m is mass, and a is acceleration. The acceleration of the satellite during the crash is calculated using this equation.

For example, if a 1000-kg satellite is traveling at a speed of 10 m/s and collides with a 500-kg asteroid, which was also traveling at 10 m/s, the two masses will experience equal and opposite forces when they collide. The force exerted on the satellite can then be determined by calculating the change in momentum before and after the crash. In conclusion, a greater change in motion was caused by the stronger crash of the two.

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The frequency of the electromagnetic wave with a wavelength of 6000 m and a speed of 3 x 10^10 cm/s is 5 x 10^4 Hz.

To find the frequency of an electromagnetic wave, we can use the equation:

v = λf

where:

v is the speed of the wave,

λ is the wavelength of the wave, and

f is the frequency of the wave.

Given:

λ = 6000 m

v = 3 x 10^10 cm/s

First, let's convert the speed from cm/s to m/s:

v = 3 x 10^10 cm/s * (1 m / 100 cm) = 3 x 10^8 m/s

Now we can rearrange the equation to solve for the frequency:

Substituting the given values:

f = (3 x 10^8 m/s) / (6000 m)

Simplifying the expression, we find:

f = 5 x 10^4 Hz

Therefore, the frequency of the electromagnetic wave with a wavelength of 6000 m and a speed of 3 x 10^10 cm/s is 5 x 10^4 Hz.

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Answer:

As altitude increases and atmospheric pressure decreases, the boiling point of water decreases.

Answer

0.16666667m/s (~0.17 m/s) is the speed of putty after colliding with a bowling ball.

Explanation:

The speed of the putty after it collides with the bowling ball can be found using the law of conservation of momentum and the concept of inelastic collisions. The law of conservation of momentum states that the total momentum of a system before a collision is equal to the total momentum of the system after the collision.

Inelastic collisions are collisions where the objects stick together and move as one after the collision. In this case, the initial momentum of the system is given by: momentum before collision = mass of putty × velocity of putty + mass of bowling ball × velocity of bowling ball= 1 kg × 1 m/s + 5 kg × 0 m/s= 1 kg m/s.

The final momentum of the system after the collision is also equal to 1 kg m/s, as there is no external force acting on the system. Since the putty sticks to the bowling ball, they move together as one object after the collision. Let's say their combined speed is v.

The final momentum of the system can be expressed as the mass of the combined object (putty + bowling ball) multiplied by the speed: v × (1 kg + 5 kg) = 1 kg m/s

                                        v = 1/6 m/s.

Therefore, the speed of the putty after it collides with the bowling ball and sticks to it is 1/6 m/s.

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If the needle in the galvanometer is going up, the conclusion about the motion of the magnet is it must be moving right.

The galvanometer is the device used to detect the small current when moving coil is deflected.

When the magnet is moved towards or into the coil of wire, the magnetic field will change and voltage will be generated into the coil. The coil  must be moving to the right when galvanometer going up.

Thus, the conclusion about the motion of the magnet is, it must be moving to the right.

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Answer: Depth does not classify soils. Soil color and other properties including texture, structure, and consistence are used to distinguish and identify soil layers.

Happy to help! (0.<)

Explanation:

The depth parameter is  does not used to classify the soil in different region. Texture, color and structure are used to characterize the soil type.

The method of classifying soil involves dividing it into groups where the behaviors of the soils within each group are the same under a certain set of physical conditions.

Engineers can use soil classification to comprehend and evaluate a particular soil's performance and determine whether the soil is suitable for particular engineering applications.

The classification of soli include  based on grain size textural classification,  AASHTO classification system,  Unified soil classification system. AASHTO classification system is developed by  Bureau of Public Roads for the classification of soil for the highway subgrade use.

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Answer:

20mA

Explanation:

because it is connected in series with the ammeter

The current through the 40Ω resistor in the given circuit is 20mA, which is explained below.

The volate across resistor R is 1V, as indicated by the voltmeter.

Since the potential of the battery is 3V, according to Kirchoff's voltage law, the voltage drop across 20Ω resistors must be 1V each since they are indentical.

Let a total current I passes through 20Ω resistor as it is connected to the battery in series. From Ohm's law:

20Ω × I = 1V

I = 50mA

Now the current indicated by the ammeter is 20mA which splits according to the reistors of 15Ω and 30Ω which are connected in parallel. Then again the current adds up to 20mA when leaving the set of parallel resistors, through the 40Ω resistor.

So the current through the 40Ω resistor is 20mA

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In this question, you need to determine the torque.

The formula for torque is

torque = weight * length of the lever arm in meters

Since we are given the mass of each child, we need to solve for their weights, which is found by multiplying their masses by the pull of gravity, which is 9.8 m/sec/sec.  

This gives the weight of the 20 kg child to be 196 Newtons, and the weight of the 30-kg child to be 294 Newtons.  

If the length between the 2 children is 0.5 meters, then let's say that the distance away that the heavier child is from the fulcrum is r.  

That makes the distance that the lighter child is away from the fulcrum as 0.5 - r.  

Now the sum of the torques must equal 0 if the seesaw is to remain balanced.  

Because one torque is positive and one is negative, we can move the negative one over to the other side of the equals sign making them equal to each other, which is what rotational equilibrium is all about.  

Here's our formula thus far:

196(0.5 - r) = 294r and

686 - 196r = 294r and

686 = 490r so

r = 1.4

Therefore, with the help of torque, we get, the heavier child is at the distance of 1.4 m and the lighter child is 3.5 - 1.4 = 2.1 m away.

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The rate of change in momentim is proportinal to the law of force. I think if I'm wrong then I apolagize

Answer:

3.76 m/s.

Explanation:

Velocity in mile per hour (mph) = 8.4 miles per hour

Velocity in metre per second (m/s) =?

Next, we shall convert 8.4 mph to ft/h. This can be obtained as follow :

1 mph = 5280 ft/h

Therefore,

8.4 mph = 8.4 mph / 1 mph × 5280 ft/h

8.4 mph = 44352 ft/h

Next, we shall convert 44352 ft/h to in/h. This is illustrated below:

1 ft/h = 12 in/h

Therefore,

44352 ft/h = 44352 ft/h / 1 ft/h × 12 in/h

44352 ft/h = 532224 in/h

Next, we shall convert 532224 in/h to m/h. This can be obtained as follow:

39.37 in/h = 1 m/h

Therefore,

532224 in/h = 532224 in/h / 39.37 in/h × 1 m/h

532224 in/h = 13518.51664 m/h

Next, we shall convert 13518.51664 m/h to m/min. This is illustrated below:

1 m/h = 1/60 m/min

Therefore,

13518.51664 m/h = 13518.51664 m/h / 1 m/h × 1/60 m/min

13518.51664 m/h = 225.30861 m/min

Finally, we shall convert 225.30861 m/min to m/s. This is illustrated below:

1 m/min = 1/60 m/s

Therefore,

225.30861 m/min = 225.30861 m/min / 1 m/min × 1/60 m/s

225.30861 m/min = 3.76 m/s

Therefore,

8.4 miles per hour is equivalent to 3.76 m/s.

Unit conversion does not change the real value. The velocity of the particle, when converted to meters per sec, is 3.756.

Unit conversion is a way of converting some common units into another without changing their real value. for, example, 1 centimeter is equal to 10 mm, though the real measurement is still the same the units and numerical values have been changed.

In order to convert the unit of velocity, we will first convert miles to meters and then, hours to seconds.

As it is given to us,

1 mile = 5280 ft

1 ft = 12 inches

1 m = 39.37 in

Now, since 1 m = 39.37 inches, therefore

\(1\rm\ in =\dfrac{1}{39.37}\ m\)

Converting a mile to meter,

\(1\rm\ miles = 5280\ ft \times 12\ inches\times \dfrac{1}{39.38} m\\\\1\ miles = 1609.652\ m\)

Converting hours to seconds

\(1\rm\ hour = 60\ minutes \times 60\ seconds\\\\1\ hour = 3600\ seconds\)

Now, converting the velocity we will get,

\(1 \rm\ \dfrac{miles}{hour} = \dfrac{1609.652}{3600}\ \dfrac{m}{s}\\\\1 \rm\ \dfrac{miles}{hour} =0.447\ \dfrac{m}{s}\)

Now, as given to us the velocity of a particle is 8.4 miles\hour, therefore,

\(8.4 \rm\ \dfrac{miles}{hour} =8.4 \times 0.447\ \dfrac{m}{s}\\\\8.4 \rm\ \dfrac{miles}{hour} =3.756\ \dfrac{m}{s}\\\\\)

Hence, the velocity of the particle when converted to meters per sec is 3.756.

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\( \boxed{\boxed{ \rm \: Velocity = \dfrac{Displacement}{Time} }}\)

I agree with Eve's hypothesis that the cart full of groceries applied more force to the empty cart than the empty cart applied to the full cart. This can be explained by Newton's third law of motion, which states that for every action, there is an equal and opposite reaction.

When the two carts collide, they exert equal and opposite forces on each other. The force exerted by the full cart on the empty cart is equal in magnitude but opposite in direction to the force exerted by the empty cart on the full cart. According to Newton's third law, these forces are a pair of action-reaction forces.

The force experienced by an object can be calculated using the equation F = m * a, where F is the force, m is the mass of the object, and a is the acceleration. Since the masses of the two carts are different (20 kg for the empty cart and 40 kg for the full cart), the force experienced by each cart will be different if the acceleration is the same.

Given that the carts collide, it is reasonable to assume that they experience the same acceleration in the opposite directions. Therefore, the force experienced by the empty cart will be smaller than the force experienced by the full cart. This is because the force is directly proportional to the mass according to Newton's second law (F = m * a).

In conclusion, according to Newton's third law of motion, the cart full of groceries applied more force to the empty cart than the empty cart applied to the full cart. The difference in mass between the two carts results in a difference in the forces they exert on each other during the collision.

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Answer: velocity

Explanation: v/t

Measurement tools make our lives safer and better? And they increase the quality and quantity of life. Arguably, the ability to measure calculating

physical properties accurately have tremendous survival value that gives humans adaptive, evolutionary advantages sharpened through many years of natural selection.

v = ir

where v is voltage and i is current

r = v/i

r = 4/0.5

r = 8 ohms

The current through a wire is 0.5 a when the potential difference across is 4.0.v, the resistance of the wire is 8.0 ohms.

Ohm's law, which states that the resistance (R) of a wire is equal to the ratio of the potential difference (V) across the wire to the current (I) flowing through it, can be used to calculate the resistance of a wire.

It has the following mathematical expression:

R = V ÷ I

Here, it is given that:

Potential difference (V) = 4.0 V

Current (I) = 0.5 A

Now we can substitute the values into the formula:

R = 4.0 V ÷ 0.5 A

Calculating the division:

R = 8.0 ohms

Therefore, the resistance of the wire is 8.0 ohms.

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Known :

S = 205 m

t = 0.6 s

Solution :

Sound speed

v = S/t

v = (205 m)/(0.6 s)

v = 341.67 m/s

Air Temperature

v² = γRT

(341.67 m/s)² = (1.4)(286 m²/s²·K)(T)

T = 291.5 K

The equation of GPE is mgH, where m is mass, g is gravitational acceleration, and H is the height.

If we're solving for the change in GPE, then:

∆\(U_{g}\) = mg∆H

Input our given values for m and g:

∆\(U_{g}\) = 0.25 * 9.80 * ∆H

The book falls from 2 meters high to 0.5 meters high, so:

∆\(U_{g}\) = 0.25 * 9.80 * (2.0 - 0.5)

∆\(U_{g}\) = 0.25 * 9.80 * 1.5

∆\(U_{g}\) = 3.675 (J)

Adjust for significant figures:

∆\(U_{g}\) = 3.7 (J)

The change in gravitational potential energy was 3.7 (J)

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The temperature of the water is the independent variable because it is being deliberately changed by the experimenter to see how it affects the rate of mineral dissolution. Option B.

The independent variable is the variable that the researcher intentionally changes or manipulates in an experiment in order to observe its effect on the dependent variable.

In this case, the independent variable is the temperature of the water because it is what Jose is changing in each trial to see how it affects the rate at which the minerals dissolve.

The dependent variable, on the other hand, is the rate at which the minerals dissolve, because it is what is being measured and expected to change based on the independent variable.

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(1) First compute the linear speed of the mass. If it completes 1 revolution in 0.5 seconds, then the mass traverses a distance of 2π (1.0 m) ≈ 2π m (the circumference of the circular path), so that its speed is

v = (1/0.5 rev/s) • (2π m/rev) = 4π m/s ≈ 12.57 m/s

Then the centripetal acceleration a is

a = v² / (1.0 m) = 16π² m/s² ≈ 160 m/s²

(where r is the path's radius).

(2) By Newton's second law, the tension in the string is T such that

T = (0.50 kg) a = 8π² N ≈ 79 N

(a) The centripetal acceleration of the mass is 158 m/s².

(b) The tension in the string at the given mass is 79 N.

The given parameters;

The angular speed of the attached mass is calculated as follows;

\(\omega = \frac{1 \ rev}{0.5 \ s} \times \frac{2\pi \ rad}{1 \ rev} \\\\\omega = 12.57 \ rad/s\)

The centripetal acceleration of the mass is calculated as follows;

\(a_c = \omega ^2 r\\\\a_c = (12.57)^2 \times 1\\\\a_c = 158 \ m/s^2\)

The tension in the string is calculated as follows;

\(T = ma_c\\\\T = 0.5 \times 158\\\\T = 79 \ N\)

Thus, the tension in the string at the given mass is 79 N.

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Answer:

trueeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

Explanation:

The theory is true that psychosocial development emphasizes that development occurs by overcoming an emotional crisis.

The term "psychosocial development" refers to how a human's personality changes during childhood and adulthood, as well as how social skills are acquired. The eight phases of psychosocial development were first described by psychologist Erik Erikson in the 1950s. According to Erikson, each stage is marked by a "psychosocial crisis" that can either have a good or negative impact on a person's personality.

Erikson asserts that a person's personality and social abilities change over the course of eight stages that span the entirety of their life. A person encounters a psychosocial crisis—critical issues—at each level, which must be overcome.

The way a person handles each of these crises has an impact on their personality. If people respond favorably, they acquire virtue (moral behavior).

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Using concepts of acceleration, velocity and position, it is found that:

A. The instantaneous velocity in 15 seconds is of -147 m/s².

B. The average velocity during this interval is of -9.8 m/s.

Cc. The distance fallen during this time is of 1102.5 meters.

The velocity after t seconds is given by the following equation:

v(t) = v(0) + at.

In which:

In the context of this problem, the values of these parameters are given as follows:

Then the velocity equation is given as follows:

v(t) = -9.8t.

In 15 seconds, the instantaneous velocity is given as follows:

v(15) = -9.8(15) = -147 m/s².

The average velocity during this interval is of given by the change in velocity divided by the change in time, hence:

Average velocity = (-147 - 0)/(15 - 0) = -9.8 m/s.

The position function is the integral of the velocity function, hence:

s(t) = -4.9t². (integral of -9.8t = -9.8t²/2 = -4.9t²).

The distance fallen in 15 seconds is:

s(t) = -4.9(15)² = -1102.5 (1102.5 meters fallen).

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The initial concentration of salt in the tank is 0 g/l, since it only contains pure water.

To find the concentration of salt after t minutes, we need to consider the amount of salt being added to the tank and the total volume of water in the tank.

At a rate of 25 l/min, the amount of brine being added to the tank per minute is:

25 l/min * 15 g salt/l = 375 g/min

After t minutes, the total volume of water in the tank will be:

7,000 l + 25 l/min * t min = 7,000 + 25t l

So the concentration of salt after t minutes is:

concentration = (amount of salt added) / (total volume of water)

concentration = (375 g/min * t min) / (7,000 + 25t l)

Simplifying this expression, we get:

concentration = 375 / (140 + t) g/l

Therefore, the concentration of salt after t minutes is:

concentration = 375 / (140 + t) g/l.

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The calculated head loss is approximately 20 meters which is option B.

Friction factor (f) = 0.018

Length of pipe and fittings (L) = 650 m

Velocity (V) = 3.0 m/s

Acceleration due to gravity (g) = 9.81 m/s²

The head loss (hL) can be calculated using the Darcy-Weisbach equation:

hL = (f * L * V²) / (2 * g * D)

Assuming a diameter (D) of 1 meter, we can substitute the values into the equation:

hf= 0.018*650*9/2*3*1=17.85

Hence ,

We considered 20 as final answer which is B.

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Answer:

A 'kink' in the glass tube which breaks the mercury as it contracts, storing the highest temperature reading. The glass tube is shaped like a lens to magnify the thin mercury thread. Shaking the thermometer resets the mercury back into the bulb.

Kink in the Mercury thermometer helps to prevents the falling of mercury present in capillary  tube into bulb. It ensures that the user takes the correct reading of temperature. That's the reason a person before taking a new reading must give a sudden shake to the clinical thermometer so that the mercury level comes to normal .

Answer:

The ratio of the potential difference across a metallic conductor to the current in the conductor is known as.

B. Resistance.

Explanation:

According to ohms law   " the current  passing through a conductor is directly proportional to the potential difference between the ends provided the temperature of the wire remains constant".

What is resistance ?

Resistance is a measure of the opposition to current flow in an electrical circuit

what is a resistor ?

a resistor is a n electric conductor which forms resistance to free flow of electric current, the resistance is measured in Ω

The ratio of the potential difference across the conductor to the current is called resistance

It is defined as the ratio of the potential difference across the conductor to the current. The resistance is measured in Ω.

\(R = \dfrac VI\)

Where,

\(R\) - resistance

\(V\)- voltage (Potential difference)

\(I\) - current

Therefore, the ratio of the potential difference across the conductor to the current is called resistance.

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