9. An 800 kg police boat slows down uniformly from 50 km/h [E] to 20 km/h (E) as it enters a

harbour. If the boat slows down over a 30 m distance, what is the force of friction on the boat?

(Hint: You will need to convert the velocities into m/s.)

Answer:

A) 8.03Hz

Explanation:

f = V/λ

Where wavelength( λ )= 30m

Speed (V) =241m/S

f= 241/30=8.03Hz

Explanation:

a) Acceleration is the change in velocity over change in time.

a = Δv / Δt

a = (-2.00 m/s − 5.00 m/s) / (14.0 s − 3.00 s)

a = -7/11 m/s²

a ≈ -0.636 m/s²

b) Force is mass times acceleration.

F = ma

F = (30.0 kg) (-0.636 m/s²)

F = -19.1 N

Sedimentary rock changes when it is exposed to extreme heat and pressure, but it can be caused by tectonic plate movement ( for heat ) and when the collide, you get the pressure.

Hope this helps, if not, comment below please!!!!

Sedimentary rock changes when it is exposed to extreme heat and pressure, but it can be caused by tectonic plate movement ( for heat ) and when the collide, you get the pressure.

Hope this helps, if not, comment below please!!!!

Answer: E = kA2/2 ⇒

A = √(2E/k) = √[2(3.24)/330] m = ? m  

Explanation: Equate the elastic potential energy at the amplitude to the total energy of the mass.  The answer will not depend on the mass.  

Answer:

3.6

Explanation:

Answer: Scientists used relative dating and absolute dating.

Explanation:

Scientists used absolute dating to determine the actual number of years ago that events happened. They used relative dating to divide Earth's past into several time frames when similar organisms were on Earth.

This is used by scientists to measure time and events during Earth's history.

Answer : Geologic Time

A compound, which releases hydrogen ions in solution would most likely react with metals to produce hydrogen gas.  

• Based on Arrhenius's concept, an acid refers to a substance, which donates or releases ions of hydrogen in water. While a base is illustrated as a substance, which donates ions of hydroxide when dissolved in water.  

• This acid when reacts with metals generates hydrogen gas, for example, when metal sodium reacts with HCl it produces hydrogen gas and NaCl.  

• On the other hand, when bases react with acids, they produce water with salt.  

Thus, the statement, that is, it would react with metals to form hydrogen gas is correct.

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Answer:

C   It would react with metals to form hydrogen gas.

Answer:

A semiconductor diode is a diode produced and made of its semiconductor material, which is more likely and most of the time silicon. It's similar and kind of like a door for electricity to move through, but the thing is it only opens one way.

Explanation:

A diode is a device for controlling electrical currents so that they flow the desired way. (Pretty much the way the engineer wants them to.)

Answer:

Socrates believed that one as a matter of fact must concentrate more on self development than on material things. He encouraged people to engage in developing friendships and love among themselves.

Answer:

B. (Mind and body are inseperable).

Explanation:

Answer:

h = 2.5m

Explanation:

In a scientific investigation, hypotheses best are tested through experimentation because the result of the experiment confirms the validation of the theoretical hypothesis formed while framing the problem statement, therefore the correct answer is option B.

Scientific investigation is the process of looking for answers by doing extensive research and finding the answers through experimental results.

The greatest way to test a hypothesis in scientific research is through an experiment since the outcome validates the theoretical hypothesis made while defining the issue statement.

Thus, the correct answer is option B.

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Answer:462400joules

Explanation:

Mass=m=800kg velocity=v=34m/s

Kinetic energy=(m x v^2)/2

Kinetic energy =(800x34^2)/2

Kinetic energy =(800x34x34)/2

kinetic energy =924800/2

Kinetic energy =462400joules

Answer:

Team A has the greatest momentum

Explanation:

The momentum of an object is a vector quantity given by

[tex]p=mv[/tex]

where

m is the mass of the object

v is its velocity

In this problem, we have to compare the momenta of the different sleds.

We have:

A) Sled Team A 48 kg moving at 10m/s:

m = 48 kg

v = 10 m/s

p = (48)(10) = 480 kg m/s

B) Sled Team B 14 kg moving at 18m/s

m = 14 kg

v = 18 m/s

p = (14)(18) = 252 kg m/s

C) Sled Team C 28 kg moving at 12m/s

m = 28 kg

v = 12 m/s

p = (28)(12) = 336 kg m/s

D) Sled Team D 22 kg moving at 12m/s

m = 22 kg

v = 12 m/s

p = (22)(12) = 264 kg m/s

So, team A has the greatest momentum.

Answer: Option C. metal

Explanation:

In a single replacement or displacement reaction, metals that are higher in activity series will displace those lower in activity

Answer:

Correct answer: t = 2.86 seconds

Explanation:

We first use this formula

V² - V₀² = 2 a d    

where V is the final velocity (speed), V₀ the initial velocity (speed),

a the acceleration and d the distance.

We will calculate the acceleration from this formula

a = (V² - V₀²) / (2 d) = (2.5² - 1²) / (2 · 5) = (6.25 - 1) / 10 = 5.25 / 10

a = 0.525 m/s²

then we use this formula

V = V₀ + a t  => t = (V - V₀) / a = (2.5 - 1) / 0.525 = 1.5 / 0.525 = 2.86 seconds

t = 2.86 seconds

God is with you!!!

Final answer:

Using kinematic equations and given values of initial and final velocities, along with the distance covered, the swimmer took approximately 2.86 seconds to accelerate to 2.5 m/s.

Explanation:

A swimmer is swimming to the left with a speed of 1.0 m/s and then accelerates to a final speed of 2.5 m/s over a distance of 5.0 m.

To find the time taken to accelerate to 2.5 m/s, we can use the kinematic equation which relates initial velocity, final velocity, acceleration, and distance: [tex]v^2 = u^2 + 2as[/tex], where v is the final velocity, u is the initial velocity, a is the acceleration, and s is the displacement.

Substituting the given values, we can solve for a, and then use v = u + at to find the time, t.

First, solving for a:
[tex]2.5^2 = 1.0^2 + 2(a)(5.0)[/tex]
6.25 = 1 + 10a
a = [tex]0.525 m/s^2[/tex]

Then, solving for t:
2.5 = 1.0 + (0.525)t
t = 2.857 seconds.

So, the swimmer took approximately 2.86 seconds to speed up to 2.5 m/s.

The average acceleration of the baseball while it's compressing the glove can be calculated using the equation of motion. This results in an acceleration of -101.66 m/s^2, indicating the ball is slowing down.

The question about finding the average acceleration of a baseball while it's compressing the catcher's glove pertains to a physics concept. We are told that the baseball is moving at a speed of 2.2 m/s when it strikes the glove, and it comes to a stop by compressing the glove by 24mm.

We can use the equation of motion: Final velocity^2 = Initial velocity^2 + 2*(Acceleration*Distance). Here, the final velocity of the baseball is zero (as it comes to a stop), the initial velocity is 2.2 m/s, and the distance is 24mm (or 0.024m, as we need to express the distance in the same unit).

Therefore, the average acceleration of the baseball is - (Initial velocity^2) / (2*Distance) = - (2.2^2) / (2*0.024) = -101.66 m/s^2. The negative sign indicates the acceleration is in the opposite direction of the ball's motion, which is expected as it's slowing down and eventually coming to a stop.

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Answer:

The velocity is 6 m/s

Explanation:

We use the formula of kinetic energy=

Ec= 1/2 x m  x v2

2160 J = 1/2 x 120 kg x v2

v =[tex]\sqrt[n]{x} 2160Joulex2/120kg\\[/tex]

v= 6m/s

1Joule= 1 kgm2/s2

Answer:

A

Explanation:

the string would be dangling backwards because you are moving forward it would be putting backward force on the string

Thus the response above i.e., "Option E" is the appropriate alternative.

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The density is [tex]1106 kg/m^3[/tex]

Explanation:

The bulk modulus of a liquid is defined as

[tex]B=\rho_0 \frac{\Delta p}{\Delta \rho}[/tex]

where

[tex]\rho_0[/tex] is the density at the reference level

[tex]\Delta p[/tex] is the change in pressure

[tex]\Delta \rho[/tex] is the change in density

The equation can be re-arranged as

[tex]\Delta \rho = \frac{\rho_0 \Delta p}{B}[/tex]

In this problem, we have:

[tex]\rho_0 = 1100 kg/m^3[/tex] (density at the surface)

[tex]B=2.3\cdot 10^9 N/m^2[/tex] (bulk modulus of seawater)

[tex]\Delta p = 126 - 1 = 125 atm = (125\cdot 1.01\cdot 10^5) Pa[/tex] (pressure difference between the point where p = 126 atm and the pressure at sea level, which is 1 atm)

Therefore,

[tex]\Delta \rho = \frac{(1100)(125\cdot 1.01\cdot 10^5)}{2.3\cdot 10^9}=6.0 kg/m^3[/tex]

So, the density at the depth where the pressure is 126 atm is

[tex]\rho = \rho_0 +\Delta \rho = 1100+6=1106 kg/m^3[/tex]

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Answer:

D- Water in the Pacific Ocean has more thermal energy and a lower temperature.

Explanation:

The Pacific Ocean had much more quantity compared to a cup of hot coffee.

The cup of coffee has a higher temperature due to direct heating, although the Pacific Ocean has more thermal energy because of its great mass.

Final answer:

To find the temperature increase, you can use the formula Q = m * c * ΔT, where Q is the heat energy added, m is the mass of the object, c is the specific heat capacity, and ΔT is the change in temperature. In this case, the temperature increases by 600 °C.

Explanation:

To find the temperature increase, we can use the formula:

Q = m * c * ΔT

where:

In this case, we have:

Using the formula, we can calculate the temperature increase as follows:

ΔT = Q / (m * c)

ΔT = (375,000 J) / (25.0 kg * 0.79 J/g · °C)

ΔT = 600 °C

Therefore, the temperature increases by 600 °C.

Answer:

the answer is B ( Argon (Ar) )

Answer:C and B

Explanation:

i hope this helps

Perception involves more than just sensory input; it includes interpretation by the brain, as evidenced by the existence of optical illusions, philosophical arguments, and conditions like synesthesia which demonstrate complex brain functions involved in perceiving the world.

The concept that there is more to perception than what our senses can detect is supported by a variety of evidence. It is important to realize that perception is a cognitive process that involves interpreting sensory information, rather than just receiving it passively. The phenomenon of illusions serves as evidence that perception can lead to misinterpretation of sensory inputs. For example, optical illusions often show that what we perceive does not always match the physical reality of what we are sensing, suggesting that our brain is involved in constructing our experiences of the world to a greater degree than we might assume.

Philosophers like Russell and Moore highlight that our beliefs about the world are mediated through and sometimes limited by our sensory experiences, which are subject to error due to limitations or malfunctions in our sense organs or interpretations by the brain. G.E. Moore’s argument about the evidence of a hand existing simply because we can perceive it without further proof is an example of direct realism and points to our reliance on perception for evidence of the external world, yet acknowledges that there is a degree of trust involved in the acceptance of sensory evidence. Furthermore, the concept of homeostasis and allostasis in relation to emotions and reason, shows that our state of mind and body can influence how we interpret sensory information.

Interestingly, the existence of phenomena like synesthesia, where stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway, suggests that perception is not purely a direct function of the senses, but can involve more complex brain functions that combine different types of sensory data into unique perceptual experiences that are not directly linked to the external stimuli.

Answer:

i) kinetic friction; ii) The friction force always acts in the opposite direction to the movement of the surface where friction exists.

Explanation:

Part i )

At that time the type of friction that exists is kinetic, as there is movement by the wheel. At the moment when the wheel remains in rest over the inclined plane, the friction force which would be used will be the static force.

Part ii)

The friction force always acts in the opposite direction to the movement of the surface where friction exists. It is not opposed to the sense of movement. In order for the wheel to rise on the inclined plane, it must turn to the right, that is to say in the clockwise direction, therefore the friction force must go in the opposite direction to the rotation of the wheel, that is to say, go in the opposite direction to the movement of the surface under friction effect, that is why it points in the same direction of displacement of the wheel.

Answer:

39.2 N

Explanation:

1kg at the earth's surface has a force of 9.8 N acting on it.

(4 kg) (9.8N) = 39.2 N

A designation of 100000 volts is a need for greater caution. The voltage is a unit of the potential different by which a given amount.

Answer:

Sound waves strike a glass and cause it to shatter. This illustrates what phenomenon? the angle at which a wave strikes a reflective medium (the angle of incidence, or theta_i) is equal to the angle at which a wave reflects off the medium (the angle of reflection)

Answer:

A) Earth and the other inner planets have higher average surface temperatures than the outer planets.

Explanation:

the earth and the other inner planets have higher average surface temperatures than the outer planets.

The reason for this response is due to the distance between the sun and the respective planet, the source of energy generation is the sun and the only way in which the temperature increase of each planet is guaranteed is by radiation, the further away a planet is from its star, its temperature will decrease. Although it is also important to highlight the atmospheric composition of the planet if this planet in its stratosphere has high density clouds that do not allow the entry of solar radiation, the temperature of the planet's surface will not increase, independent of the distance from the sun, but these are more complex cases where specialists in that area enter to perform a study in detail.

A. The conclusion is that Earth and the other inner planets have higher average surface temperatures than the outer planets.

The conclusion that can be drawn from the information provided is that Earth and the other inner planets have higher average surface temperatures than the outer planets.

This can be seen by comparing the temperature ranges of the inner planets (Mercury, Venus, Earth, and Mars) with the temperature ranges of the outer planets (Jupiter, Saturn, Uranus, and Neptune). The inner planets have higher average temperatures compared to the outer planets.

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Answer:

A projectile is an object upon which the only force is gravity.

Explanation Gravity acts to influence the vertical motion of the projectile, thus causing a vertical acceleration. The horizontal motion of the projectile is the result of the tendency of any object in motion to remain in motion at constant velocity.

Final answer:

Gravity affects the vertical motion of a projectile by imparting a constant downward acceleration of 9.8 m/s², while the horizontal motion remains constant and independent of this vertical force. Consequently, the horizontal and vertical velocities of an object in projectile motion are influenced separately by gravity.

Explanation:

The unbalanced force of gravity affects the horizontal and vertical velocities of an object in projectile motion by impacting them independently. Gravity causes a constant vertical acceleration of 9.8 m/s² (downwards) that does not influence the horizontal motion, which remains constant if air resistance is ignored. The horizontal motion of an object in projectile motion is independent of its vertical motion because the force of gravity only acts downwards.

Projectile motion is interesting to study since it involves two independent components of motion: horizontal and vertical. An example of this independence is that the time it takes for a horizontally launched projectile to hit the ground is determined solely by its vertical motion, unaffected by its horizontal velocity.

During projectile motion, at the peak of its trajectory, the projectile has only a horizontal velocity component and effectively resembles uniform circular motion for an instant, since gravity acts perpendicular to the motion.

Answer:

 a= g sinθ

Explanation:

Given that

Angle ,θ = 15° (from the horizontal)

Lets take the mass of the block = m

The acceleration due to gravity = g

The acceleration of the block = a

When block slide down :

The gravitational force on the block =  m g sinθ

By using Newton's second law

F= m a

F=Net force ,a acceleration ,m=mass

m g sinθ =  ma

a= g sinθ

Therefore the acceleration of the block will be g sinθ.