compare the mass of block A, the mass of block B is:

As we know the time period of pendulum is given by the equation

[tex]T = 2\pi \sqrt{\frac{L}{g}}[/tex]

so here

L = length of the pendulum

Now on increasing the temperature due to thermal expansion the length of the pendulum will increase and due to this the time period of the pendulum will also increase

Now due to increase in time period of the pendulum the clock will become slow and it will give incorrect time due to this increase in temperature

Thermal expansion increases the pendulum period, and the clock will lose time

Simple Harmonic Motion is the motion of an object (repetitive movement) through its equilibrium point where the frequency of vibrations / oscillation per second is constant

The motion that occurs in the pendulum is one example of simple harmonic motion

Terms used:

Whereas the relationship T and f:

[tex]\displaystyle T=\frac{1}{f}\\\\f=\frac{n}{t}[/tex]

n = number of vibrations / oscillation

t = time (s)

Formula used:

[tex]\large{\boxed{\bold{T=2\pi \sqrt{\frac{L}{g} }}}\rightarrow \frac{1}{f}=2\pi \sqrt{\frac{L}{g} }[/tex]

From this formula shows that the period is proportional to the length of the pendulum rod . The longer the pendulum rod , the greater the amount of time in one vibration

If thermal expansion occurs in the pendulum clocks, the pendulum rod changes in length ,proportional to the temperature change, and increases the pendulum period, so the clock will lose time

The distance of the elevator  

brainly.com/question/8729508  

Rank the pendulums according to the number of complete cycles

https://brainly.com/question/13644763

the average velocity  

brainly.com/question/5248528  

Answer:

59.2 N

Explanation:

According to Newton's second law, the resultant of the forces acting on the box must be equal to the product between the box's mass and its acceleration:

[tex]F_{net}=ma[/tex]

However, the box is moving at constant velocity, so its acceleration is zero:

a = 0

Therefore, the net force along the direction of motion (parallel to the surface) must be zero.

We have two forces acting along the direction parallel to the ground:

- The applied force, F

- The frictional force, [tex]\mu mg[/tex], in the opposite direction, with [tex]\mu = 0.3021[/tex] being the coefficient of friction, m = 20 kg the mass of the box and g = 9.8 m/s^2

Therefore, the equation of motion becomes:

[tex]F-\mu mg=0[/tex]

And solving for F, we find:

[tex]F=\mu mg=(0.3021)(20 kg)(9.8 m/s^2)=59.2 N[/tex]

B looks closest ...

move tail of down pointing vector to tail of other one and make a parallelogram ... join junctions of first tails to final arrowheads ...

Or

join tail of right hand vector to tip of left hand vector to get two sides of a vector triangle.

then join tail of left hand vector to tip of right vector for third side of triangle and the resultant.

either way should work, both give same answer

Vector 'a' is made out of some 'up' and some 'right'.

Vector 'b' cancels most or all of the 'up' part of 'a', leaving only the 'right' part and maybe a slight bit of 'up'.

The only choice that is mostly 'right' with maybe a slight bit of 'up' is choice-B.

Choice-A has too much 'up' in it.

Choices C and D both have some 'left' in them. They couldn't get any 'left' from 'a' or 'b'.

Answer:

The kinetic energy of the animal is 45 Joule.

Explanation:

Kinetic energy of the animal is given by,

Kinetic energy = [tex]\frac{1}{2} m v^{2}[/tex]

Given: m = 10 kg , v = 3 m/s

Thus,

Kinetic energy = [tex]\frac{1}{2} (10) (3)^{2}[/tex]

Kinetic energy = 45 Joule,

The kinetic energy of the animal is 45 Joule.

Well, let's see.  I'll call the distance between the two towns ' D '.

Time to cover the distance = (distance/speed) .  I'll call the scheduled number of hours ' t ' .

16 minutes = 4/15 of an hour, and 10 minutes = 1/6 of an hour.

So . . .

(t + 1/6) = D/40.   Multiply by 4:  4t + 4/6 = D/10

(t + 4/15) =  D/30. Multiply by 3: 3t + 12/15 = D/10

Great.  The left sides are both equal to D/10, so we can say

4t + 4/6 = 3t + 12/15

Subtract 3t from each side:  t + 4/6 = 12/15

Subtract 4/6 from each side:  t = 12/15 - 4/6

Simplify the right side:  t = 4/5 - 2/3

Make a common denominator:  t = 12/15 - 10/15

t = the scheduled time = 2/15 of an hour  (8 minutes)

Looking back up above, we found that 3t + 12/15 = D/10

Plug in 2/15 in place of 't' : 3(2/15) + 12/15 = D/10

Simplify the left side:  18/15 = D/10

Multiply by 10:  D = 180/15 . . . . D = 12 miles

============================

This is such a dog of a bear of a problem, I think I ought to check my answer:

== Somewhere up above, I calculated that the scheduled time is supposed to be 8 minutes.

== Time = (distance) / (speed)

== At 40 mph, time = (12 miles) / (40 mi/hr) = 12/40 hr = 18 minutes ... 10 minutes late !

-- At 30 mph, time = (12 mi) / (30 mi/hr) = 12/30 hr = 24 minutes ... 16 minutes late !

YAY !

QED !

Unbelievable

[tex]\bf{Given : Hubble\;Constant(H_0) = 73(\frac{km}{s \times Mpc})}[/tex]

[tex]\bf{Given : Conversion\;Factor = (\frac{1Mpc}{3.086 \times 10^1^9\;km})}[/tex]

[tex]\bf{\implies Resulting\;Hubble\;Constant = 73(\frac{km}{s \times Mpc})(\frac{1Mpc}{3.086 \times 10^1^9\;km})}[/tex]

[tex]\bf{\implies Resulting\;Hubble\;Constant = 73(\frac{1}{s \times 3.086 \times 10^1^9})}[/tex]

[tex]\bf{\implies Resulting\;Hubble\;Constant = (\frac{23.65}{s \times 10^1^9})}[/tex]

[tex]\bf{\implies Resulting\;Hubble\;Constant = 2.365 \times 10^-^1^8(1/s)[/tex]

v=v2-v1=15-10=5 cm/s

p=mv=0.15•5=0.75 kg•cm/s

Answer : The correct option is, (A) 7.5 mN.s

Explanation :

Impulse : It is defined as the force applied to an object for a certain amount of time.

Formula used :

[tex]I=F\times \Delta t[/tex]

As we know that:

[tex]F=m\times \Delta a\\\\\Delta a=\frac{\Delta v}{\Delta t}[/tex]

Thus, formula of impulse will be:

[tex]I=m\times \Delta v[/tex]

where,

I = impulse  = ?

m = mass = 0.15 kg

[tex]\Delta v[/tex] = change in speed of velocity = [tex]v_{final}-v_{initial}=15cm/s-10cm/s=5cm/s=0.05m/s[/tex]     (1 m = 100 cm)

Now put all the given values in the above formula, we get:

[tex]I=(0.15kg)\times (0.05m/s)[/tex]

[tex]I=0.0075kg.m/s=0.0075N.s=7.5mN.s[/tex]      (1 N.s = 1000 mN.s)

Therefore, the impulse acting on the car is, 7.5 mN.s

Assuming (for the least amount of time) that it is 60mph all the way through. Divide the two numbers

1500/60 = 25

B. 25 hours is your answer

~

25 hours.

All you have to do to find out is divide 60 into 1500 and you will get B:25 hours

Question: The part of the eye responsible for most of the refraction of incoming light is the _____.

Answer: lens

Explanation: this is because your eye lens reflects of light from your eyes like when the sunlight shines aff a pair of glasses it makes fire

question answered by

(jacemorris04)

Answer:

Explanation:

Positive acceleration increases speed, negative acceleration is decreasing speed.

For example on a car the gas pedal would be positive acceleration and brake would be negative.

Answer:  Positive acceleration represents an object speeding up; negative acceleration represents an object slowing down.

Explanation:

hope it helped xx

Answer:

Multiply the air pressure by the area of the tabletop.

Explanation:

The relationship between pressure, force and area is given by:

[tex]p=\frac{F}{A}[/tex]

where in this case, p is the air pressure, F is the force exerted and A the area of the tabletop. By re-arranging the equation, we can solve for F, the force exerted:

[tex]p=\frac{F}{A}\\p\cdot A=\frac{F}{A}\cdot A\\pA=F[/tex]

So, the correct answer is:

The force exerted on the tabletop can be found by multiplying the air pressure by the area of the tabletop.

Given that

time (t) = 10 s ,

         (S) = ?

We know that  S = ut+ 1/2 a.t²  m

                         since free fall and no air friction,

                               a = g = 9.81 m/s² ; initial velocity u= 0

                         S = 0 + [1/2 × 9.81 ×10²]

                          S = 490.5 m

Answer:

The 3rd graph

Explanation:

A free body diagram is a diagram which shows all the forces acting on an object.

The problem asks us to find the free body diagram of block A, so we must find all the forces acting on block A.

We have 3 forces acting on block A in total:

- The force of gravity (its weight), which pushes the block downward (in the diagram, it is the force represented with [tex]F_{gA}[/tex]

- The tension in the rope 1, which pulls block A upwards: this force is represented with [tex]F_{T1}[/tex]

- The tension in the rope 2, due to the weight of block 2, which pulls block A downwards: this force is represented with [tex]F_{T2}[/tex]

Based on the direction of these 3 forces, the correct diagram is the 3rd one.

Answer:

t he third graph

Explanation:

Answer:  

Potential energy , because it is defined as the energy held by object because of its position relative to other objects.. It is based on its distance from ground

Given data

    mass (m) = 67 kg ,

   height (h) = 230 m ,

      Potential energy (P.E.) = m. g. h

                                            = 67 × 9.81 × 230

                                            = 151172.1 J

                                  P.E.   = 151.18 KJ

Electromagnetic waves are the waves which can also travel through the vacuum. Example of electromagnetic waves are - Radio waves , micro waves, Infrared waves, Light (visible portion of electromagnetic spectrum), Ultraviolet rays, Xrays and gamma rays.

Hence A that is light waves is the correct option.  

The answer is A! I hope this helps!

18 hours 770

770/18 average speed.

Answer:

The average speed for both days, while driving is 42.77 miles/hr.

Explanation:

Given that,

Distance first day = 500 miles

Distance second day = 270 miles

According to question,

The distance covered by the john in 10 hours = 500 miles

Next day ,

The distance covered by the john in 8 hours = 270 miles

We need to calculate the average speed for both days

Using formula of the average speed

[tex]v_{avg}=\dfrac{D}{T}[/tex]

Where, D = total distance

T = total time

Put the value into the formula

[tex]v_{avg}=\dfrac{500+270}{10+8}[/tex]

[tex]v_{avg}=\dfrac{770}{18}[/tex]

[tex]v_{avg}=42.77\ miles/hr[/tex]

Hence, The average speed for both days, while driving is 42.77 miles/hr.

For any wave,  Wavelength = (speed) / (frequency).

So the Slinky Wavelength = (6.6 m/s) / (3 / sec)

Wavelength = 2.2 meters .

It takes the compression in the wave 2.2 seconds to travel the length of the classroom.

energy. It will not disrupt the picture developing process by overexposing too much light on the film.

The answer is B (energy). I have had this question before and B is correct.

Quarks are fundamental particles that make up other subatomic particles such as protons and neutrons. Quarks are not made up of any other particles.

Answer:

The wave is moving from left to right (as indicated by the arrow), so, given that at the current instance the amplitude of the position V is 0 (or whatever midpoint the dashed line corresponds to), in the immediately next instance the position will continue increasing as the wave moves from left to right. The peak currently shown at U will at some point "arrive" at V. At that point the location V will have the maximum amplitude. After that the direction at position will be downward, etc.

Answer: liquid A flows slower i got it right on the exam

Explanation:

Something is missing in question. But I will try to explain you about Doppler effect to reach your answer.

Answer:

If you on USA TEST prep the answer was "RIGHT"

Under the condition of no pressure, water will change into gas. This phase change can occur by boiling if the water is in a liquid state or sublimation if it is a solid, as there is no liquid phase at extremely low pressures.

If there is no pressure, water will change into gas. This process is understood through the physical properties of water and its behavior under different temperature and pressure conditions. When energy is added into a system containing water, the water molecules begin to move faster. As more energy is put in, the temperature rises until it reaches the boiling point, which is a fixed temperature specific to each substance where it changes from liquid to gas.

However, at extremely low pressures, the scenario changes. There is no liquid phase for water below 0.00600 atm, implying that water can either be a gas or a solid. In these conditions, water undergoes a phase change known as sublimation, where it transitions directly from a solid to a gas without becoming liquid.

Thus, under the condition of 'no pressure,' which is an extreme low-pressure scenario, water will opt for the gaseous state, either by boiling from the liquid state if it originally was a liquid, or by sublimating if it was a solid.

In the absence of pressure, water will turn into a gas through the process of sublimation, where at extremely low pressures below 0.00600 atm, it can directly transition from a solid to a gas.

If there is no pressure, water will change into gas. This phenomenon is because, at sufficiently low pressures, water has no liquid phase and can exist either as a gas or as a solid. When water molecules receive enough kinetic energy, such as at their boiling point, they overcome intermolecular forces and transition to the gas phase. At pressures below approximately 0.00600 atm, this transition happens directly from a solid to a gas, a process known as sublimation. This accounts for effects like the dry ice sublimating at standard pressure and the routine defrosting of a freezer.

Excuse are not acceptable

Resistance per 1000 feet for gauge 14 wire is given as

R = 2.525 ohm

now if wire is of length 50 feet only then the resistance is given as

[tex]R = \frac{2.525}{1000}\times 50[/tex]

[tex]R = 0.126 ohm[/tex]

now if 11 A current flows through the wire then the voltage drop is given by ohm's law

[tex]V = iR[/tex]

[tex]V = 11 \times 0.126[/tex]

[tex]V = 1.4 Volts[/tex]

so most appropriate answer in given options is

A. 1.8 Volts

Answer:

Efficiency of wedge is the ratio of "work done by the machine to the work supplied to the machine".

           Efficiency (η) = Work done by machine ÷ Work supplied

                                  = 65 ÷ 75

                                 = 0.86%

Efficiency of wedge is 86%

Answer:

17.4 N

Explanation:

According to Newton's second law, the net force acting on the box along the ramp is equal to the product of mass and acceleration:

[tex]F_{net}=ma[/tex]

If we want to move the box at constant velocity, this means acceleration equal to zero: a = 0, so the previous equation becomes:

[tex]F_{net}=0[/tex] (1)

Let's now understand what are the forces exerted on the box along the surface of the ramp:

- The pull (the applied force), let's call it F, which pulls up along the ramp. However, this pull is applied at an angle of 40 degrees, so the actual pull along the ramp will be [tex]F cos 40^{\circ}[/tex]

- The component of the weight parallel to the surface of the ramp, equal to

[tex]-mg sin \theta[/tex]

where (mg) = 49 N is the weight of the box and [tex]\theta=10^{\circ}[/tex] is the angle of the ramp. This force pulls down along the ramp, so we put a negative sign in front of it.

- The frictional force, equals to

[tex]-\mu mg cos \theta[/tex]

where [tex]\mu=0.1[/tex] is the coefficient of friction. This force pulls down along the ramp (in the opposite direction of the motion), so we put a negative sign as well

Therefore, the equation for the net force (1) becomes:

[tex]F cos 40^{\circ}-mg sin \theta -\mu mg cos \theta =0[/tex]

from which we can find the value of F:

[tex]F=\frac{mg sin \theta + \mu mg cos \theta}{cos 40^{\circ}}=\frac{(49 N)(sin 10^{\circ})+(0.1)(49 N)(cos 10^{\circ})}{cos 40^{\circ}}=17.4 N[/tex]

Answer: Option (A) is the correct answer.

Explanation:

When a substance like sand gets carried away along with the flow of wind then this process is known as erosion.

When a substance is kept in air for too long and this exposure causes change in appearance or texture of the substance then it is known as weathering.

When rocks gets deposited on a land then this is known as deposits rocks on.

Thus, we can conclude that when Sam blew out through a straw and directed his breath at a pan of sand. Sam is showing the rest of his class how the wind erodes the land.

pH measures the acidity or alkalinity of a substance, with 7 being neutral.

The term pH is a measure of how acidic or alkaline (basic) a substance is. The pH scale is logarithmic and ranges from 0 to 14, where 7 is considered neutral. A pH below 7 indicates acidity, while a pH above 7 indicates alkalinity. The acceptable level of pH varies depending on the substance and the biological system. For example, in humans, the normal range of blood pH is between 7.35 and 7.45, which is slightly alkaline. Conditions such as acidosis and alkalosis occur when the blood pH falls too low or rises too high, respectively.

Maintaining a consistent pH is crucial in living organisms to ensure optimal conditions for chemical reactions. Even small fluctuations in pH levels can affect protein structure and function, which is critical for life processes. Outside of biological systems, pH levels are also significant in environmental contexts, such as the impact of Acid Rain on the pH of natural waters, which is important for the survival of aquatic life.