Running along a rectangular track 50m × 40 m you complete one lap in 100 s. What is your average velocity for the lap ?

Answer:

No.

Explanation:

When the ball is kicked it has Gravity, Normal Force and applied force.

Answer:

Explanation:

The force due to an electric field is a vector quantity because it has direction and magnitude just like Newton's Law

Answer:  

a) the magnitude of r is  184.62

b) the direction is 37.74° south of the negative x-axis

Explanation:

Given the data in the question;

as illustrated in the image blow;

To find the the magnitude of r, we will use the Pythagoras theorem

r² = y² + x²

r = √( y² + x²)

we substitute

r = √((-113)² + (-146)²)

r = √(12769 + 21316 )

r = √(34085 )

r = 184.62

Therefore, the magnitude of r is  184.62

To find its direction, we need to find ∅

from SOH CAH TOA

tan = opposite / adjacent

tan∅ = -113 / -146

tan∅ = 0.77397

∅ = tan⁻¹( 0.77397 )

∅ = 37.74°

Therefore, the direction is 37.74° south of the negative x-axis

Answer:

increases, increases

Explanation:

The energy difference between the two spin states increases with an increasing applied field.

Resonance is achieved when electromagnetic radiation is equal to the processional frequency.

The magnetic field strength applied causes a change in the energy required and frequency at which resonance occurs. As the magnetic field strength increases, it causes an increase in energy difference between the spin states which in turn increases the frequency.

Increasing the induced magnetic field strength Increase the energy gap between spin states and therefore increases the frequency required for resonance.

Answer:

This is somewhat of a confusing question.

 Zero potential energy is usually used to refers to the zero potential energy of objects at infinity. Thus, bringing an object from infinity requires negative work because work is done by the object. One could also choose the pivot point of the pendulum as zero potential. Then any objects above the pivot point would be at a positive potential, and objects below the pivot point would have a negative potential (the object does work moving to a point of lower potential).

 Basically, work done "on" an object requires positive potential energy input while work done "by" the object requires negative energy input.

 Those are the basic considerations in solving potential energy problems.

This question is incomplete, the complete question is;

A 1800 kg hybrid vehicle operates on ethanol and is equipped with a multipurpose motorgenerator-flywheel. When the vehicle slows or stops, 50% of the kinetic energy is recovered as electrical energy in the battery. When the IC engine is used to recharge the battery, there is a 25% efficiency of converting chemical energy in the fuel to electrical energy stored in the battery. The vehicle slows from 70 miles per hour to 20 miles per hour. Calculate: (A) Electrical energy recovered in the battery in [kJ] (B) Mass of fuel needed to store same amount of energy in the battery in [kg]

Answer:

a) Electrical energy recovered in the battery is 404.6895 kJ

b) Mass of fuel needed to store same amount of energy in the battery is 0.0606 kg

Explanation:

Given that;

Initial speed of the vehicle V = 70 miles per hour = 31.293 m/s

Final speed of the vehicle u = 20 miles per hour = 8.941 m/s

mass of vehicle m = 1800 kg

Noe, change in kinetic energy of the vehicle will be;

[tex]E_{kinetic}[/tex] = [tex]\frac{1}{2}[/tex]m( v² - u² )

we substitute

=  [tex]\frac{1}{2}[/tex] × 1800( (31.293)² - (8.941)² )

= 900( 979.2518 - 79.9414)

= 900 × 899.3104

=  809379.36 J

[tex]E_{kinetic}[/tex] = 809.379 kJ

now, Electrical energy recovered in the battery when the vehicle slows will be;

[tex]E_{battery}[/tex] = 50% × [tex]E_{kinetic}[/tex]

[tex]E_{battery}[/tex] = 50/100 × 809.379 kJ

[tex]E_{battery}[/tex] =  404.6895 kJ

Therefore, Electrical energy recovered in the battery is 404.6895 kJ

b)

For this electrical energy to be obtained from fuel, the chemical energy required will be;

[tex]E_{chemical}[/tex] =  [tex]E_{battery}[/tex] / 25%

[tex]E_{chemical}[/tex] =  404.6895 kJ / 0.25

[tex]E_{chemical}[/tex]  = 1618.758 kJ  

Heat energy released per mass of ethanol combustion

(Lower heating value of ethanol) is 26.7kJ/g

Now, the mass of fuel needed to generate  1618.758 kJ will be;

[tex]m_{fuel}[/tex] = 1618.758 kJ / 26.7kJ/g

[tex]m_{fuel}[/tex] = 60.63 g

[tex]m_{fuel}[/tex] = 0.0606 kg

Therefore, Mass of fuel needed to store same amount of energy in the battery is 0.0606 kg

Answer:

1470Joules

Explanation:

Workdone = Force * distance

Since the worker pushes the crate up the 3m ramp. The distance covered is 3m

Force = Mass * Acceleration due to gravity

Force = 50*9.8

Force = 490N

Workdone = 490 * 3

Workdone = 1470Joules

Hence I did 1470Joules of work

Answer:

14.5 N I'm pretty sure I think this is the answer

Answer:

h = 21.5 m

Explanation:

       [tex]\Delta y = v_{oy}* t -\frac{1}{2}*g*t^{2} (1)[/tex]

       [tex]v_{ox} = v* cos 37 = 21 m/s * cos 37 = 16.8 m/s (2)[/tex]

       [tex]v_{oy} = v* sin 37 = 21 m/s * sin 37 = 12.6 m/s (3)[/tex]

       [tex]t = \frac{\Delta x}{v_{ox} } = \frac{63m}{16.8m/s} = 3.75 s (4)[/tex]

     [tex]-h = 12.6m/s* 3.75s -\frac{1}{2}*(9.8m/s2)*(3.75s)^{2} = -21.5 m (5)[/tex]

Answer:

Explanation:

The flagpole will act as closed organ pipe . If λ be wavelength of wave produced ,

n x λ / 4 = L where L is length of pole . n is odd integer like 1 , 3 , 5 ,7 etc .

λ = 4 L / n

for lowest frequency , wavelength will be highest . For highest  λ , n = 1

λ = 4 L = 4 x 5.99

= 23.96 m

frequency of wave = speed of wave / wavelength

= 2730 / 23.96 = 114 approx .

2 )

The frequency range heard by mouse = 1010 Hz to 90000 Hz .

The fundamental frequency ( lowest harmonic ) of flagpole is 114 Hz

Higher odd harmonics are also possible . If n be the lowest harmonic in the audible range of mouse ,

n x 114 = 1010

n = 8.85 or 9 th or 11 th

9 th is not in the option , 11 th is the right option .

d . 11 th is the answer .

1. The lowest frequency standing wave that can be formed on the flagpole is 114 Hz.

2.  The lowest flagpole harmonic that the mouse can hear is 11th. Hence, option (d) is correct.

When a sound wave is propagating through any medium, such that the total wave produced in one second, is known as the frequency of the sound wave.

1.

Given data:

The height of fiberglass is, h = 5.99 m.

The wave propagation speed in fiberglass is, v = 2730 m/s.

The flagpole will act as a closed organ pipe. If λ be the wavelength of the wave produced,

n x λ / 4 = L

here,

L is the length of the pole.

n is an odd integer like 1, 3, 5,7, etc.

Arranging the above expression as,

λ = 4 L / n

for the lowest frequency, the wavelength will be the highest . For highest  λ , n = 1

λ = 4 L

λ = 4 x 5.99

λ = 23.96 m

frequency of wave = speed of wave / wavelength

frequency of wave = 2730 / 23.96

frequency of wave = 114 Hz

Thus, we can conclude that the lowest frequency standing wave that can be formed on the flagpole is 114 Hz.

2.

The frequency range heard by the mouse = 1010 Hz to 90000 Hz.

The fundamental frequency ( lowest harmonic ) of the flagpole is 114 Hz.

Higher odd harmonics are also possible. If n be the lowest harmonic in the audible range of mouse,

n x 114 = 1010

n = 8.85 or 9 th or 11 th

Thus, we can conclude that the lowest flagpole harmonic that the mouse can hear is 11th. Hence, option (d) is correct.

Learn more about standing wave frequency here:

https://brainly.com/question/1967686

Answer:

D. Friction

Explanation:

Answer:

d. friction

I took it on study island and got it correct thanks to the other guy that has answered

Explanation:

Answer:

it would change and the points would be off because of the change

Answer:

1 Acetaldehyde C2H4O

2 Acetamide C2H5NO

3 Acetic acid CH3COOH

4 Acetone C3H6O

Explanation: These are the only ones I know

The force applied to small piston = 2.2 x 10³ N

Given

a radius of 5 cm and 15 cm

weight 20000 N

Required

Force applied

Solution

Pascal Law :

F₁/A₁=F₂/A₂

A₁ = π.5²

A₂ = π.15²

F₁/ π.5² cm² = 20000/π.15² cm²

F₁ = 2222.22 N⇒2.2 x 10³ N

In order to have a period that matches the Earth's rotation, a satellite must be in a circular orbit, and 42,164 km from the center of the Earth.

But that's not quite enough to make sure that it always stays over the same point on the Earth's surface (and appears motionless in the sky). For that to happen, the satellite's orbit has to be directly over the Equator.

The Moon has nothing to do with any of this.

Answer:

When we have a plane interface, the angle of incidence of the ray is the same as the angle of reflection.

In this case, we have a mirror (we assume that it is plane) and we know that we need to have an angle of reflection equal to 38° in order to reach Sam.

Then the angle of incidence of the ray must also be exactly 38°.

Then Billy needs to shine his laser at an angle of 38° at the mirror.

(where the angle is measured between the normal line to the surface of the mirror and the incident ray)

Billy needs to shine the laser at an incident angle of 38 degrees.

LASER is an acronym that stands for “light amplification by the stimulated emission of radiation.” We know that according to the laws of reflection, the angle of incidence is equal to the angle of reflection.

As such, knowing that Sam is at a 38 degree reflection angle from the mirror, Billy needs to shine the laser at an incident angle of 38 degrees.

Learn more: https://brainly.com/question/8592296?

Answer:

B. 75,000nm

Explanation:

The wavelength of a wave can be calculated thus;

λ = v/f

Where;

λ = wavelength (m)

v = velocity of light = 3 × 10^8m/s

f = frequency (Hz)

According to this question, the EM wave has a frequency of 4THz i.e. 4 Terahertz = 4 × 10^12Hz

λ = 3 × 10^8 ÷ 4 × 10^12

λ = 3/4 × 10^(8-12)

λ = 0.75 × 10^-4

λ = 0.000075m

Based on the options given, this value is equivalent to 75,000nm, which means 75000 × 10^-9m.

Answer:

F = 75 N

Explanation:

Given that,

Mass of a sculpture, m = 150 kg

The acceleration of the sculpture, a = 0.5 m/s²

We need to find the force with which the curator pushes the sculpture.

F = ma

Substitute all the values of m and a in it.

F = 150 kg × 0.5 m/s²

= 75 N

So, the required force with which the curator pushes the sculpture is 75 N.

Answer:

ee that the lens with the shortest focal length has a smaller object

Explanation:

For this exercise we use the constructor equation or Gaussian equation

        [tex]\frac{1}{f} = \frac{1}{p} + \frac{1}{q}[/tex]

where f is the focal length, p and q are the distance to the object and the image respectively.

Magnification a lens system is

          m = [tex]\frac{h'}{h}[/tex] = - [tex]\frac{q}{p}[/tex]

             h ’= -\frac{h q}{p}

In the exercise give the value of the height of the object h = 0.50cm and the position of the object p =∞

Let's calculate the distance to the image for each lens

f = 6.0 cm

           [tex]\frac{1}{q} = \frac{1}{f } - \frac{1}{p}[/tex]

as they indicate that the light fills the entire lens, this indicates that the object is at infinity, remember that the light of the laser rays is almost parallel, therefore p = inf

          q = f = 6.0 cm

for the lens of f = 12.0 cm q = 12.0 cn

to find the size of the image we use

           h ’= h q / p

where p has a high value and is the same for all systems

           h ’= h / p q

Thus

f = 6 cm h ’= fo 6 cm

f = 12 cm h ’= fo 12  cm

therefore we see that the lens with the shortest focal length has a smaller object

Answer: 10 miles south

Explanation:

Answer:

411.88 N

Explanation:

Given that:

mass of satellite m = 1847 kg

mass of the earth M = 5.97 × 10²⁴ kg

centripetal acceleration a = 0.223 m/s²

The magnitude of the force exerted by the earth on the satellite = the centripetal force that is being exerted by the satellite.

∴

[tex]m \dfrac{v^2}{r} = G \dfrac{mM}{r^2}[/tex]

[tex]ma = G \dfrac{mM}{r^2}[/tex]

[tex]G \dfrac{mM}{r^2}= 1847 \times 0.223[/tex]

[tex]G \dfrac{mM}{r^2}= 411.88 \ N[/tex]

Answer:

A. Velocity is negative (-)

Acceleration is positive,(+)

B. Velocity is positive. (+)

Acceleration is negative (-)  

C. Velocity is zero (0).

Acceleration is negative (-)

Explanation:

The elevator is said to be moving downward, therefore, its motion is in the negative direction as the positive direction is upward in the y-axis. Velocity is negative (-)

As the elevator is making an emergency stop, it is decelerating. Deceleration is negative acceleration. However, since it occurs in the opposite direction, i.e. acceleration vector is pointing upward, acceleration is positive,(+)

The motion of the ball is in the upward direction, therefore the velocity is positive. (+)

The acceleration due to the force of gravity acts in the opposite direction to that of the ball, i.e. downwards, acceleration is negative (-)  

At maximum height, the ball will stop moving, therefore, velocity is zero (0).

Since acceleration due to the force of gravity acts downward, the acceleration is negative (-)

Answer:

objects in motion will continue to move in motion unless acted upon by an unbalanced force.

Explanation:

Moral duties are the duties performed by the people on the basis of humanity and moral values. The following are some of the moral duties :

Hope I helped ! ♡

Have a wonderful day / night ! ツ ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁

Answer:

Blood flow rapidly decreases and blood pools in your feet

Explanation:

Because I did the test and if u don't want to except my answer then ***** but if u do and get it right mark it the best. OK?

Answer:

The answer is A blood flows rapidly decreases blood pools in your feet

Explanation:

I hope the helps i just did the quiz/test and got it correct

Answer:

gravity pills from the center of earth bringing you to the ground

No lo se hsjdhdhfhjdhshdhdhhd