Two hockey players are about to collide on the ice, One player has a mass of
65 kg and is traveling at 1.8 m/s east. The other has a mass of 70 kg and is
traveling at 1.4 m/s west. The system consists of the two hockey players,
According to the law of conservation of momentum, what is the total
momentum of the system after they collide? Assume the collision is an
elastic collision
A. 19 kg'm/s east
B. 215 kgm/s east
C. 19 kgm/s west
D. 215 kgm/s west

According to Einstein's general theory of relativity, curved spacetime is what causes gravity.

However, gravity a force in the broadest sense since it defines the interaction that results when two masses are in close proximity to one another. The warping of spacetime and also the motion of things through the stretched spacetime are the primary causes of gravitational effects. It appears as though a force was exerted towards the end, though.

With the publication of his general theory of relativity in 1915, Albert Einstein provided the solution. All mass-bearing things, such as the Earth, really bend and curve spacetime, which is what causes gravity to draw you toward the earth. You experience gravity because of its curvature.

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Your question is incomplete. Please find below the complete question.

B. Its acceleration is 9.8 m/s^2 down.

Acceleration, is the rate at which speed adjustments with time, in phrases of pace and path. A point or an item moving in a line is expanded if it hurries up or slows down.

We always have a vertical (downward ) acceleration of 9,8 m/s^2. The horizontal acceleration is zero in case you overlook friction forces. The vertical issue of speed is zero on the top of the trajectory whilst the horizontal component isn't like zero in any other case the apple will no longer arrive at your buddy.

You toss an apple across the room to a friend. Which of the following statements is true about the apple at the top of its trajectory?

A. Its acceleration is zero.

B. Its acceleration is 9.8 m/s2 down.

C. The horizontal component of its velocity is zero.

D. The vertical component of its velocity is 9.8 m/s down.

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The force that cannot be the resultant of these forces is 10N since it is less than both given forces

Given the forces with a magnitude of 12N and 24N, the resultant of these forces must not be less than any of the two forces.

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Answer:

15.1 m/s²

Explanation:

Step 1: Calculate the force exerted by the friction

Friction exerts a force against the direction of the movement. On a horizontal plane, we can calculate the value of that force using the following expression.

Ff = μ × m × g

where,

μ: coefficient of kinetic friction

m: mass of the block

g: gravity

Ff = 0.50 × 10 kg × 9.81 m/s² = 49 N

Step 2: Calculate the resulting force

The horizontal force F and the friction force Ff are vectors that act in opposite directions. We can calculate the resulting force (R) by doing the subtraction.

R = F - Ff = R = 200 N - 49 N = 151 N

Step 3: Calculate the acceleration of the block

We will use Newton's second law of motion.

R = m × a

a = R/m

a = 151 N/10 kg = 15.1 m/s²

Nuclear energy is the energy in the nucleus, or core, of an atom. Nuclear energy can be used to create kinetic energy or electricity, but it must first be released from the atom.

Nuclear energy originates from the splitting of uranium atoms – a process called fission. This generates heat to produce steam, which is used by a turbine generator to generate electricity. Because nuclear power plants do not burn fuel, they do not produce greenhouse gas emissions.

Some primary uses of nuclear energy are- Space Exploration, Nuclear energy provides nearly 20% of electricity in many countries like United States, Medical Diagnosis and Treatment, Criminal Investigation and Agriculture.

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The circumference of the circle that can be drawn with a string that is 7 cm long is 7π or approximately 21.99 cm.

To find the circumference of the circle that can be drawn with a string that is 7 cm long, we need to use the formula for circumference. The formula for circumference is C = 2πr, where r is the radius of the circle.

Since we have a piece of string that is 7 cm long, this means that the radius of the circle is half of the length of the string, which is 7/2 = 3.5 cm.

Now, we can use the formula for circumference to calculate the value:
C = 2πr
C = 2π(3.5)
C = 7π

Therefore, the circumference of the circle that can be drawn with a string that is 7 cm long is 7π, which is approximately 21.99 cm (since π is approximately 3.14).

In conclusion, the circumference of the circle that can be drawn with a string that is 7 cm long is 7π or approximately 21.99 cm.

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Answer:

increases your heart rate

Explanation:

Warming up increases your heart rate and therefore your blood flow which enables more oxygen to reach your muscles.

Think about the end of the world! Venus is circling the sun at a very close distance. And no, having shorter days or a shorter year to orbit the sun does not spell the apocalypse: but the Earth that is burning... literally!

So these would most likely happen to Earth if it were moved to the location of Venus:

Image: Venus, a hot planet rich in carbon dioxide vs. Earth, a planet rich in water and oxygen

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In Chapter 10 of the book Leader Within You 2.0 by Maxwell, the author emphasizes on the importance of persistence. He highlights that persistence is necessary for attaining success in any area of life. It is particularly important for leaders who are looking to bring change or innovate.

Persisting through challenges and obstacles is crucial because it is inevitable that these challenges will arise. Maxwell provides various examples of famous leaders who persisted through difficult times. He notes that leaders should not be discouraged by failure and that they should use it as an opportunity to learn from their mistakes and grow

Additionally, leaders should not be afraid to take risks because it is impossible to achieve success without taking risks. Maxwell concludes the chapter by emphasizing that persistent people never give up and that persistence is key to reaching success.

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Answer:

4. A. rope climb

5. True

6. True

Explanation:

hope it's help

Answer:  

Explanation:

at first the rock is at rest so initial velocity is zero
after accelerating it reaches a final velocity
we are supposed to find that final velocity


\(v^{2} = u^{2} +2ax\)
v= final velocity
u= initial velocity
x= distance
a= acceleration

\(v^{2} = 0^{2} + 2(9.8)(14.4)\)
\(v^{2} = 282.24\)
\(v= \sqrt{282.24}\)
\(v= 16.8 m/s\)

Answer:

Aesthetic sports

Explanation:

Aesthetic sports are the one's that need well-developed physical qualities such as strength, agility, stamina, flexibility, and technical knowledge and artistry, in addition to technical ability and artistry. Elite athletes in these sports generally have a low abdominal fat , and the ranking is subjective.

In aesthetic sports like gymnastics, swimming, and figure skaters, dynamic and proactive flexibility is required.

The Volume of Copper Cube with mass 153.6 g and density 8.96 g/cm³ is 17.14 cm³ and its Edge is 2.58 cm long.

We have a Copper Cube of mass 153.6 g and density 8.96 g/cm³.

We have to calculate the volume and length of the cube in cm³ and cm respectively.

The density and mass of body are related as follows -

M = ρV

Where -

M - mass of body

ρ - density of body

According to the question, we have →

Mass of copper cube = 153.6 g

Density of copper cube = 8.96 g/cm³

Using the formula discussed above -

M = ρV

V = M/ρ = 153.6/8.96 = 17.14 cm³

We know that the volume of cube is -

V = a x a x a

a³ = 17.14 cm³

a = 2.58 cm

Hence, the Volume of Cube is 17.14 cm³ and its Edge is 2.58 cm long.

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Answer:

(A) Increases

Explanation:

Hope this helps ;)

Answer:

the answer is 1500 you multiply the distance and force to get work

A(n) Neap tide occurs when the sun is at right angels to the line between earth and the moon.

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The overall electrical resistance that a circuit experiences as a result of all of its resistors acting in concert against its voltage source are known as the equivalent resistance of the circuit.

The total resistance, or equivalent resistance, is equal to the mathematical sum of the two resistances if there are two unequal resistors or impedances in a series.

Where the whole resistance is connected in parallel or series is known as the equivalent resistance. Electrical resistance indicates the amount of energy needed to transfer the charges, or current, across the circuit.

The total or equivalent resistance, RT, is equal to half the value of one resistor if the two parallel resistances or impedances are equal and of the same value.

The overall electrical resistance that a circuit experiences as a result of all of its resistors acting in concert against its voltage source are known as the equivalent resistance of the circuit.

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Answer:

the sum of the mass numbers on the reactant side must equal the sum of the ,was numbers on the product side.

Explanation:

This is the answer. I'm not sure

The neutron number can be calculated by subtracting the atomic number from the mass number. In this case, 54 - 23 = 31. Therefore, the neutron number is 31.
To determine the element identity, we need to find the element with a mass number of 54 and a proton number of 23. This can be done by looking at the periodic table. Based on these numbers, we know that the element has 23 protons, which places it in the 23rd position on the periodic table. The element with the atomic number 23 is vanadium (V). Therefore, the element identity is vanadium (V).
In summary, for an element with a mass number of 54 and a proton number of 23, the neutron number is 31 and the element identity is vanadium (V).
To determine the neutron number and element identity, you can use the given mass number (A) and proton number (Z).
1. Neutron number:
Neutron number = Mass number (A) - Proton number (Z)
Neutron number = 54 - 23
Neutron number = 31
2. Element identity:
Since the proton number (Z) is also the atomic number, you can use it to identify the element. With an atomic number of 23, the element is Vanadium (V).
In summary, for the element X with mass number 54 and proton number 23, the neutron number is 31, and the element is Vanadium (V).

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Answer:

10lbs on the moon

Explanation:

Answer:

27.9617 mi/h

Explanation:

Speed= distance/time

S= 15000/1200

a. 39/19K is stable, and 40/19K is radioactive.

b. 209Bi is stable, and 208Bi is radioactive.

c. Both nickel-58 and nickel-65 are stable; neither is radioactive.

To determine which nuclide in each pair is radioactive and which one is stable, we need to consider the properties of the nuclides, specifically their atomic numbers (Z) and mass numbers (A).

a. 39/19K and 40/19K:

Nuclide 39/19K has an atomic number (Z) of 19 and a mass number (A) of 39.

Nuclide 40/19K has an atomic number (Z) of 19 and a mass number (A) of 40.

Both nuclides have the same atomic number, indicating they are isotopes of potassium. However, only one of these isotopes is radioactive. In this case, 40/19K is radioactive, and 39/19K is stable.

b. 209Bi and 208Bi:

Nuclide 209Bi has an atomic number (Z) of 83 and a mass number (A) of 209.

Nuclide 208Bi has an atomic number (Z) of 83 and a mass number (A) of 208.

Both nuclides have the same atomic number, indicating they are isotopes of bismuth. In this case, 209Bi is the stable nuclide, and 208Bi is radioactive.

c. Nickel-58 and nickel-65:

Nickel-58 has an atomic number (Z) of 28 and a mass number (A) of 58.

Nickel-65 has an atomic number (Z) of 28 and a mass number (A) of 65.

Both nuclides have the same atomic number, indicating they are isotopes of nickel. In this case, both nickel-58 and nickel-65 are stable, as neither of them is radioactive.

Hence, a. 39/19K is stable, and 40/19K is radioactive.

b. 209Bi is stable, and 208Bi is radioactive.

c. Both nickel-58 and nickel-65 are stable; neither is radioactive.

The given question is incomplete and the complete question is '' One of the nuclides in each of the following pairs is radioactive. Predict which is radioactive and which is stable. a. 39/19K and 40/19Kb. 209Bi and 208Bic. nickel-58 and nickel-65 ''.

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Answer:

making the size of the car bigger is good

A class assignment requires the building of sloar powered car then improving the design by reducing the mass of the design will be a better option.

A solar cell, also known as a photovoltaic cell, is any apparatus that directly transforms light into electricity using the photovoltaic effect. The great majority of solar modules are called silicon, which can be found in amorphous (noncrystalline), polycrystalline, and crystal (single crystal) varieties, with varying degrees of efficiencies.

Solar cells do not use oxidation processes or require fuel to generate electricity, making them, unlike batteries. They also do not include any moving parts, making them, unlike electric generators.

Arrays are big collections of solar cells that can be put together. These arrays, which are made up of thousands of separate cells, have the capacity to serve as central electric power plants, transforming solar energy into electricity and distributing it to customers in the commercial, industrial, and residential sectors.

By reducing the mass of the design the car will become lightweight then it is able to get speed quickly also the efficiency of the car will also improve.

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Answer:

f/2

Explanation:

In this case the force that is necessary to keep the object moving in a curved path and that is directed inward toward the center of rotation, centripetal force = f

f= m × centripetal acceleration

centripetal acceleration = V^2/r

Therefore f = m (2v)^2 /r --------1

If frictional force required to keep the large car on the road = F

F= 2m (v)^2/ r----------2

Now Divide 1st equation by 2nd one

f/F = m (2v)^2/2m(v)^2

f/F = 2

F= f/2

Answer:

I think it's D

Explanation:

because kinetic basically means moving and potential mean sitting still so ig it's c or D

Answer:

Machine C has the highest efficiency with 75%.

Explanation:

Answer: no it shouldn't be

Explanation:

Maintaining a healthy DO level is crucial for the well-being of aquatic life, water quality, regulatory compliance, and the overall ecological balance.

A. To determine if the construction of the wastewater treatment plant will cause the dissolved oxygen (DO) to drop below the state standard, we can use the Streeter-Phelps equation. The equation considers the deoxygenation and reoxygenation processes in a stream.

Given the waste characteristics and water characteristics upstream, we can calculate the expected DO downstream using the following formula:

DO downstream = DO upstream + [(DO deficit) x (1 - e^(-k1 * t))] - [(DO surplus) x (1 - e^(-k2 * t))]

Where:

DO upstream is the dissolved oxygen concentration upstream (9.1 mg/L)

DO deficit is the difference between the DO standard (4 mg/L) and the expected DO upstream

DO surplus is the difference between the expected DO upstream and the DO concentration in the waste discharge (2.0 mg/L)

k1 is the deoxygenation constant (0.2 day⁻¹)

k2 is the reoxygenation constant (0.4 day⁻¹)

t is the time of travel downstream

By substituting the given values into the equation and calculating the DO downstream, we can compare it with the state standard of 4 mg/L. If the calculated DO downstream is below the standard, then the construction of the plant may cause the DO level to drop below the state standard.

b. If during a hot summer day, the flow in the stream drops to 0.2 m/s and the temperature in the stream increases to 30°C, we need to assess whether the state DO standard of 4 mg/L can still be met. Using the Streeter-Phelps equation, we can calculate the expected DO downstream under these conditions. The equation takes into account the deoxygenation and reoxygenation processes in the stream.

By substituting the given values into the Streeter-Phelps equation and solving for the DO downstream, we can compare it with the state standard of 4 mg/L. The equation is as follows:

DO downstream = DO upstream + [(DO deficit) x (1 - e^(-k1 * t))] - [(DO surplus) x (1 - e^(-k2 * t))]

Where:

DO upstream is the dissolved oxygen concentration upstream (9.1 mg/L)

DO deficit is the difference between the DO standard (4 mg/L) and the expected DO upstream

DO surplus is the difference between the expected DO upstream and the DO concentration in the waste discharge (2.0 mg/L)

k1 is the deoxygenation constant (0.2 day⁻¹)

k2 is the reoxygenation constant (0.4 day⁻¹)

t is the time of travel downstream

By substituting the given values and calculating the DO downstream, we can determine if the state DO standard will be met.

c. In the wintertime when the stream is ice-covered and there is no reaeration (k2 = 0), we need to assess if the state dissolved oxygen (DO) standard of 4 mg/L can be met considering the given conditions.

Using the Streeter-Phelps equation without reaeration, we have:

DO downstream = DO upstream + [(DO deficit) x (1 - e^(-k1 * t))]

Since k2 = 0, the reoxygenation term is eliminated.

By substituting the given values into the Streeter-Phelps equation and solving for the DO downstream, we can compare it with the state standard of 4 mg/L.

Given the temperature of the water in the stream is 4°C, and all other characteristics remain the same as in part a, we can calculate the DO downstream. It's important to note that lower temperatures generally result in higher dissolved oxygen levels due to increased oxygen solubility in cold water.

By calculating the DO downstream using the updated temperature and the remaining characteristics, we can determine if the state DO standard will be met in the wintertime when the stream is ice-covered.

d. If the dissolved oxygen drops to zero under the ice during winter, it is a cause for concern. A complete depletion of DO can lead to anoxic conditions, harming aquatic life. Many organisms rely on oxygen for survival, and without it, they may experience stress, suffocation, or even die. Maintaining an adequate DO level is crucial for supporting a healthy aquatic ecosystem, preventing the occurrence of negative ecological impacts, and preserving water quality for various organisms and uses.

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At a point p on the ring's axis, the electric potential due to the ring is

V = \(\frac{kQ}{\sqrt{z^{2} +}R^{2} }\)

The amount of work required to move a unit of electric charge from a reference point to a specific place in an electric field is known as the electric potential.

dV =kdq/r

From the figure given below:

r = \(\sqrt{z^{2}+R^{2} }\)

By integrating the equation we got,

V = kQ/r

As E = -dV/dz,

Therefore, At a point p on the ring's axis, the electric potential due to the ring is:

V = \(\frac{kQ}{\sqrt{z^{2} +}R^{2} }\)

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In the photoelectric effect, the stopping voltage is the minimum voltage applied across the cathode and anode that prevents the photoelectrons from reaching the anode.

The stopping voltage is directly related to the maximum kinetic energy of the photoelectrons.

Part A:

If the light intensity is doubled, it means that the number of incident photons per unit time on the gold cathode doubles.

Increasing the light intensity leads to an increase in the number of photoelectrons emitted per unit time, but it does not affect the maximum kinetic energy of the emitted photoelectrons. Therefore, the stopping voltage will stay the same if the light intensity is doubled.

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