A snowmobile has an initial velocity of 3 m/s. (a) If it accelerates at 0.5 m/s² for 7 seconds
what is the final velocity? (b) If it then accelerates at -0.6 m/s², how long will it take to
reach a complete stop (assume the starting velocity for the negative acceleration is the
answer from part a)?

The approximate period of this pendulum on the moon where the acceleration due to gravity is roughly 1/6 that of earth is 15s. The correct option is -d. 15 s.

On Earth, we know that T=6.0 s. Let's assume the length of the pendulum remains constant.
Now, on the moon, the acceleration due to gravity is approximately 1/6 that of Earth's, so g'=g/6.

Using the same equation as before, we can find the new period T' on the moon:
T' = 2π√(L/g') = 2π√(L/(g/6)) = 2π√(6L/g)

Substituting in T=6.0 s, we have:
T' = 2π√(6L/g) = 2π√(6T^2g/L) = 2π√(6(6.0 s)^2(9.81 m/s^2)/L)

Since we are looking for an approximate answer, we can estimate L to be roughly the same on the moon as it is on Earth. Therefore, we can simplify the equation to:

T' ≈ 2π√(6(6.0 s)^2(9.81 m/s^2)/L) ≈ 2π√(216) ≈ 29.1 s
Therefore, the correct option is -d. 15 s.

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The period of a pendulum is the time it takes for the pendulum to complete one full swing. In this case, we know that a simple pendulum on earth has a period of 6.0 s. However, on the moon, the acceleration due to gravity is roughly 1/6 that of earth.Therefore, the correct answer is (b) 2.4 s.

This means that the force acting on the pendulum is much weaker on the moon than on earth. As a result, the pendulum will swing slower on the moon than on earth. To calculate the approximate period of the pendulum on the moon, we can use the formula T=2π√(l/g), where T is the period, l is the length of the pendulum, and g is the acceleration due to gravity. Plugging in the appropriate values, we get T=2π√(l/(1/6g)). Simplifying this equation, we can see that the period on the moon will be approximately 2.4 s. Therefore, the correct answer is (b) 2.4 s.

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From the principle of the conservation of energy, the velocity of the moving skater would be transferred to the stationary skater.

We know that according to the principle of the conservation of energy, energy can neither be created nor destroyed but we can be able to convert the energy from one form to the other. Given the fact that the energy of the object can be converted, we can also look at the collision as being an inelastic Collison.

Let us recall that a collsion is said to be in elastic if the momemtum and thge kinetic energy of the colliding particles is not conserved. The simple implication of this is that the objects would stick together and then move at a common velocity after the collision must have taken place in the system.

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Answer:

The starting height of the ball is approximately 0.604 m

Explanation:

The given parameters are;

The mass of the the ball = 0.050

The speed with which it travels through the top loop = 2 m/s

The given height at which the ball moves at 2 m/s = 0.40 m

Therefore, we have;

1/2·m·v² = m·g·h

1/2·v² = g·h

h = 1/2·v²/g = 1/2 × 2²/9.81 ≈ 0.204

The additional height = h = 0.204 m

Therefore;

The starting height of the ball  ≈ The given height at which the ball moves at 2 m/s + h

The starting height of the ball  ≈ 0.40 + 0.204 = 0.604 m

The starting height of the ball ≈ 0.604 m.

When any object in rest, then potential energy is present. But when object is in motion then object have kinetic energy.

Starting height of the ball is 0.604 m.

We know that, when any object is start from rest, then potential energy is converted into kinetic energy.

     \(\frac{1}{2}mv^{2} =mgh\)

Where m is mass of object, g is gravitational acceleration , h is height and v is velocity of object. (value of g = 9.81 m/ second square)

from above equation,

we get,     extra height        \(h=\frac{v^{2} }{2g} \\\\h=\frac{4}{2*9.81}\\\\h=0.204\) meter

The starting height of the ball will be sum of the height at which ball moves 2 m/s and extra height.

Starting height = 0.40 + 0.204 = 0.604 meter.

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Answer:

C - 5.3s

Explanation:

a = v - u / t

so,

t = v - u / a

t = 180 - 100 / 15

t = 5.3s

Answer:

The pressure at a depth 01 25 m is 2.5 x 10^5 Pa. This is almost 2.5 times greater than atmospheric pressure. But he air pressure in the hose will be only slightly higher than atmospheric pressure, because the density of air is so low. So Tom will have great difficulty breathing in the low-pressure air when the large pressure of the water is pressing in on his chest.

Explanation:

The depth is h = 25 m

The density of water p = 1000 kg/m^3

Acceleration due to gravity g = 9.81 m/s^3.

Pressure due to a depth is gotten from

P = pgh

P = 1000 x 9.81 x 25 =245250 Pa

==> 2.45 x 10^5 Pa

Approximately 2.5 x 10^5 Pa

Atmospheric pressure = 1.01325 x 10^5 Pa

Dividing the pressure at the bottom of the pond by the atmospheric pressure gives a value of about 2.5,which means that the pressure is 2.5 times the atmospheric pressure.

Answer:

For metric-system conversions, follow this method: Sound travels at about 340 m/s, so multiply the number of seconds you counted by 340, and you'll know how many meters away lightning struck. A three-second count, then, would place the lightning strike about 1,020 m away, or roughly 1 km.

Explanation:

hope it hep and if it doesnt sorry

The distance struck by the lighting flashes is 680 m.

The given parameters;

The distance struck by the lighting is calculated by applying the principle of echo as follows;

\(v = \frac{2d}{t} \\\\2d = vt\\\\d = \frac{vt}{2} \\\\d = \frac{340 \times 4}{2} \\\\d = 680 \ m\)

Thus, the distance struck by the lighting flashes is 680 m.

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That the combination of an object's mass, speed, and distance from the center of rotation determines its angular momentum.

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Some of the advantages of gravity are it allows earth and other solar bodies to remain in their axis, and it helps us to maintain balance.

This is the force that attracts object towards the center of the earth.

Gravity has several advantages and they include the followings;

Thus, some of the advantages of gravity are it allows earth and other solar bodies to remain in their axis, and it helps us to maintain balance.

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If a polymer is partially or fully crystallized, its properties will likely change in a number of ways. Crystallization involves the formation of a regular, ordered structure within the polymer, which can have a significant impact on its mechanical, thermal, and chemical properties.

For example, crystallized polymers tend to be more rigid and less flexible than their non-crystalline counterparts, due to the increased ordering of the molecular chains. This can lead to improved strength and stiffness, but may also make the polymer more brittle and prone to cracking or breaking under stress.

Additionally, crystallized polymers often have a higher melting point and greater thermal stability than non-crystalline polymers, due to the increased energy required to break apart the ordered structure. This can make them more resistant to heat and chemical degradation, but may also make them more difficult to process and mold.

Overall, the specific changes in properties that occur when a polymer is partially or fully crystallized will depend on a variety of factors, including the specific polymer chemistry, the degree of crystallinity, and the processing conditions used to induce crystallization. However, in general, crystallization is likely to result in a more ordered and rigid polymer with improved thermal and mechanical properties.

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Answer:

200 N Right

Explanation:

The 50 up and 50 down  balance or 'cancel' each other

   then you only have the 200 N to the right

The given statement is False.

A "C hook" or "grab hook" is indeed a sliding hook used to form a choker sling when hooked to a sling eye. The C-shaped design of the hook allows it to slide and adjust along the sling eye, creating a secure choker configuration.

In rigging and lifting applications, slings are often used to securely lift and move loads. A choker sling is a specific configuration where the sling is wrapped around the load and then connected back to itself using a sliding hook. The sliding hook, commonly referred to as a C hook or grab hook, has a shape that resembles the letter "C" with a latch or latchless design.

When the C hook is attached to the sling eye, it can slide along the eye, allowing the sling to tighten around the load and form a secure choker configuration. This helps distribute the load's weight evenly across the sling and increases the stability and grip when lifting or moving the load.

The sliding hook's ability to adjust along the sling eye provides versatility in creating the desired choker configuration for different loads and applications. It is important to ensure proper training and adherence to safety guidelines when using rigging equipment, including C hooks or grab hooks, to ensure safe lifting operations.

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Answer:

Time

Explanation:

To find velocity (also known as distance), you need both the speed and time.

If two stars are emitting the same amount of light, the star that is farther away will appear dimmer than the closest star. This is because light travels in straight lines and is subject to the inverse square law, which states that the intensity of light decreases as the square of the distance from the source increases.

Therefore, the farther the star is from Earth, the more spread out its light becomes, resulting in a decrease in apparent brightness. This effect can be observed in the night sky, where some stars appear brighter than others even though they emit the same amount of light. Astronomers use this principle to determine the distance between stars and other celestial objects by measuring their apparent brightness and comparing it to their known luminosity. This is a crucial tool for understanding the structure and evolution of the universe.

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Answer:

Nuclear Fusion

Explanation:

Nuclear fusion is the nuclear reaction in which two lighter nucleus combine to form a larger more stable nucleus with the release of energy.

²₁H + ¹₁H ⇒ ³₂He + energy

In this case, a hydrogen atom reacts with a deuterium atom to produce a helium atom and energy.

Since two smaller atoms combine to produce a larger atom, nuclear fusion occurs.

Answer:

Fusion

Explanation:

Fusion but nuclear fusion is right but only fusion for APE X is needed

Answer:

5 kg m/s

Explanation:

Because you need 5 N to push a 5 kg object so 5 will be left over

Answer:

1.606 kilometers

Explanation:

Divide the number of pounds by 2.20462262 to convert it to kilograms. For example, if an object weighs 5 pounds, divide it by 2.20462262 to get 2.6796. If you need a general number, rather than an exact number, you can divide the number of pounds by 2.2.

Multiply the number of inches by 2.54 to convert it to centimeters. For example, if an object is 12 inches long, multiply it by 2.54 to get 30.48 centimeters.

Reverse the process to convert kilograms to pounds or centimeters to inches. If you want to convert kilograms to inches, multiply the number of kilograms by 2.20462262 to convert it to pounds. Divide the number of centimeters by 2.54 to get the number of inches.

Answer:

The third charge needs to be placed at \(x \approx 0.57\; \rm m\).

Explanation:

Both \(q_1\) and \(q_2\) would attract \(q_3\).

These two electrostatic attractions need to balance one another. Hence, they need to be opposite to one another. Therefore, \(q_1\) and \(q_2\) need to be on opposite sides of \(q_3\). That is possible only if \(q_3 \!\) is on the line segment between \(q_1 \!\) and \(q_2 \!\).

Assume that \(q_3\) is at \(x\; \rm m\), where \(0 < x < 3.72\) (in other words, \(q_3 \!\) is on the line segment between \(q_1\) and \(q_2\), and is \(x\; \rm m \!\) away from \(q_2 \!\).)

Let \(k\) denote Coulomb's constant.

The magnitude of the electrostatic attraction between \(q_1\) and \(q_3\) would be:

\(\displaystyle \frac{k\cdot q_1 \cdot q_3}{(3.72 - x)^{2}}\).

Similarly, the magnitude of the electrostatic attraction between \(q_2\) and \(q_3\) would be:

\(\displaystyle \frac{k\cdot q_2 \cdot q_3}{x^{2}}\).

The magnitudes of these two electrostatic attractions need to be equal to one another for the resultant electrostatic force on \(q_3\) to be \(0\). Equate these two expressions and solve for \(x\):

\(\displaystyle \frac{k\cdot q_1 \cdot q_3}{(3.72 - x)^{2}} = \frac{k\cdot q_2 \cdot q_3}{x^{2}}\).

\(\displaystyle \frac{q_1}{(3.72 - x)^{2}} = \frac{q_2}{x^{2}}\).

\(\displaystyle \frac{x^2}{(3.72 - x)^{2}} = \frac{q_2}{q_1}\).

\(\displaystyle \frac{x^2}{(3.72 - x)^{2}} = \frac{q_2}{q_1} = \frac{1}{30}\).

By the assumption that \((0 < x < 3.72)\), it should be true that \((x > 0)\) and \((3.72 - x > 0)\). Therefore, \(\displaystyle \frac{x}{(3.72 - x)} > 0\).

Take the square root of both sides of the equation \(\displaystyle \frac{x^2}{(3.72 - x)^{2}} = \frac{1}{30}\).

\(\displaystyle \sqrt{\frac{x^2}{(3.72 - x)^{2}}} = \sqrt{\frac{1}{30}}\).

\(\displaystyle \frac{x}{3.72 - x} = \frac{1}{\sqrt{30}}\).

\(\sqrt{30}\, x = 3.72 - x\).

Therefore:

\(\left(1 + \sqrt{30}\right)\, x = 3.72\).

\(\displaystyle x = \frac{3.72}{1 + \sqrt{30}} \approx 0.57\).

Hence, \(q_3\) should be placed at \(x \approx 0.57\; \rm m\).

Explanation:

Heat liberated by a body depends on the mass of the body, the specific heat capacity of that body and the change in temperature experienced by the body.

Heat energy by a body depends on the surface area of the body A as well as the temperature of body T.

According to Stefan's law, rate of heat energy radiated by a body is given by P=σAeT^4

Thus more is the temperature of body, more is the heat radiated. Also mores is the surface area of body, more is the heat radiated.

heat depends on three factors:

(1) The change in temperature,

(2) the mass of the system, and

(3) the substance and phase of the substance.

Explanation:

Given,

The velocity of the spaceship in as observed by an observer at the earth, v=0.75c

The time interval as observed by the observer on the earth, t₁=2.5 s

The time elapsed in the ship's frame of reference is given by,

On substituting the known values,

Thus the time elapsed for an observer in the spaceship is 3.79 s

Among the given options, natural gas is considered a nonrenewable energy source. Nonrenewable energy sources are those that cannot be replenished or regenerated at a rate that matches their consumption.

Natural gas is formed from the remains of ancient plants and animals that were buried and subjected to heat and pressure over millions of years. Once extracted and used, natural gas is depleted and cannot be easily replaced within a human lifetime.

On the other hand, solar power, wind power, and geothermal energy are considered renewable energy sources. Solar power harnesses the energy from the sun using photovoltaic panels, while wind power utilizes the kinetic energy of wind to generate electricity. Geothermal energy taps into the heat from the Earth's core. These renewable sources are considered sustainable as they are continuously available and do not deplete with usage. They offer a cleaner and more environmentally friendly alternative to nonrenewable energy sources like natural gas, which contribute to carbon emissions and climate change.

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When two rope segments pull up on the load in the single movable pulley, the optimal mechanical advantage is 2. This sort of pulley does not change the direction of the applied force, but it does increase it by a factor of two.

There are two methods for calculating a pulley system's mechanical advantage.

The mechanical advantage may be calculated simply by counting the number of falls (or active lifting ropes) that are really attached to the load. You may also split the effort distance by the load distance.

Assuming an ideal rope and pulley system with a mechanical advantage of  \(2.00\) , the output load that can be lifted with an input force of \(200 N\) can be calculated using the formula:

Output force = Input force x Mechanical advantage

Where the mechanical advantage is given as \(2.00\)  .

Thus, the output force is:

Output force \(= 200 N \times 2.00 = 400 N\)

Therefore, with an input force of \(200 N\)  , the rope and pulley system can lift an output load of up to \(400 N\) .

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Answer:

power=300watt

Explanation:

Answer: It is matter

Explanation:

Answer:

D

Explanation:

Trust me, I just did the test. :) :) :)

Answer:

Copper isn't ferromagnetic,

Aluminum isn't ferromagnetic,

String has a ferromagnetic property

So in conclusion:

The answer is strings :)

Answer:

The luminosity remains the same, but the apparent brightness is decreased by a factor of four.

Explanation:

The apparent brightness, F = L/4πr² where L = luminosity and r = distance between us and the star.

Since L is independent of the distance between us and the star, it is constant, then

F ∝ 1/r²

So, F₁/F₂ = r₂²/r₁² where F₁ = apparent brightness at r₁ and F₂ = apparent brightness at r₂

If the distance is doubled, that is r₂ = 2r₁, then

F₁/F₂ = r₂²/r₁²

F₁/F₂ = (2r₁)²/r₁²

F₁/F₂ = 4r₁²/r₁²

F₁/F₂ = 4

F₂ = F₁/4

So, since the luminosity is constant, the luminosity remains the same, but the apparent brightness is decreased by a factor of four.

Answer:

to prevent to much current

Explanation:

in the event of a power surge the circuit breaker will cut the power. this is what people mean when they say "pop" the breaker

An electromagnet can be attracted to or repelled by a magnet, depending on the polarity of the two magnets. Option A.

In other words, the only option that is attracted to or repelled by a magnet is an electromagnet.

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An electromagnet will be attracted to a magnet.

option A.

A magnet is a material or object that produces a magnetic field. The magnetic field is a force that can attract or repel certain materials, such as iron, nickel, and cobalt.

Magnets have two poles, a north pole and a south pole, which are responsible for their magnetic properties. Like poles of magnets (north-north or south-south) repel each other, while opposite poles (north-south or south-north) attract each other.

A copper wire not carrying current will not be attracted or repelled by a magnet.

Thus, the only correct answer is an electromagnet.

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Answer:

The time taken is missing in the question. The time is 18 minutes.

The answer is 34.3 km/hr

Explanation:

Average velocity is the speed or the velocity which is required to cover a distance in a time interval.

The time taken is = 18 min

                            = 18/60 hours

The distance from the university to her home is = 10.3 km

Therefore, the average velocity is = displacement/time taken

                                                         = 10.3 / (18/60) km/hr

                                                         = 34.3 km/hr

Hence, the average velocity is 34.3 km/hr