We all know the trick of pretending to lose a cell phone connection, but the receiving person (in reality) can usually tell you have a good connection. This time, you are in luck- you are using a cell phone at 850 MHz, on one side of you is the cell phone tower, and on the other side, a tall building.
1) what is the wavelength of your cell phone transmission?
2) How far from the building should you stand to lose reception?
3) Since the phone companies employ good engineers, that trick won't actually work. However, you happen to see a chain-link fence nearby, and (out of desperation) try to use that as a diffraction grating to scatter the radiation. Estimating the link spacing as 5 cm, will this work?

The top speed of a cheetah in m/s is 31.29 m/s.

Given data:

The initial speed of a Cheetah is, u = 0 mph.

The final speed of the Cheetah is, v = 70 mph.

The time interval is t = 2.2 seconds.

We are already given with top speed of a Cheetah, and it’s none other than the final speed itself. Now we need to convert the mph value of top speed into m/s value.

We know that,

1 mph = 0.44704 m/s

So, the value of 70 mph in m/s is,

Thus, we can conclude that the top speed of a cheetah in m/s is 31.29 m/s.

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You will take 3 second to stop and you will go 9 meters far.

The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.

Given that:

Initial velocity: u = 6 m/s.

deceleration: a = 2 m/s^2.

Final velocity = 0 m/s.

We have to find:  time: t = ? and distance travelled: s = ?

So, time taken to stop = v/a = 6/2 second = 3 second.

Distance travelled in this process: s = v^2/2a = (6×6)/(2×2) meter = 9 meter.

Hence, you will take 3 second to stop and you will go 9 meters far.

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The position versus time graph that matches the description: a speed versus time graph has a horizontal line at 5 m/s from zero to five seconds is Graph A; The correct option is A.

A  position versus time graph is a graph that plots the position of an object against the time it takes for the object to move from one point to another.

The slope of a position versus time graph represents the speed or velocity of the object.

The slope of a position time graph = distance or position/time

A speed versus time graph is a graph that plots the speed of an object against the time it takes for the object to move to that speed.

The slope of a position versus time graph represents the acceleration of the object.

Considering the given speed versus time graphs:

Graph A: the speed versus time graph has a horizontal line at 5 m/s from zero to five seconds.

Graph B: the speed versus time graph shows variation is speed over time

Graph C: the speed versus time graph shows a constant increase in speed over time

Graph D; the speed versus time graph shows a constant decrease in speed over time

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The force between the two point charge when they are separated by 18 cm is 3 N

Coulomb's law states as follow:

F = Kq₁q₂ / r²

Cross multiply

Fr² = Kq₁q₂

Kq₁q₂ => constant

F₁r₁² = F₂r₂²

Where

With the above formula, we can obtain the force between the two point charge when they are 18 cm apart. Details below:

F₁r₁² = F₂r₂²

27 × 6² = F₂ × 18²

972 = F₂ × 324

Divide both side by 324

F₂ = 927 / 324

F₂ = 3 N

Thus, the force when they are 18 cm apart is 3 N

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Answer:

Speed = (2πr)/t = (2π x 12 m)/2.1 s = 28.6 m/s

Acceleration = (vf-vi)/t = (28.6 m/s - 0 m/s)/2.1 s = 13.6 m/s^2

Answer:

it won't move unless it has momentum

Explanation:

Answer: 8.0 m/s2

Explanation:

F = ma

a = F/m

F = 12,000 N

m = 1,500 kg

a = 12,000 N / 1,500 kg = 8.0 m/s2

The fraction of the initial kinetic energy is transformed into thermal energy is 3/4.

The fraction of the initial kinetic energy is transformed into thermal energy is calculated by applying the principle of conservation of energy as shown below.

Mathematically, this is given as;

ΔK.E = E

where;

E = K.Ef - K.Ei

where;

E = (¹/₂mu² - ¹/₂mv²) / (¹/₂mu²)

where;

E = (u² - v²) / (u²)

E = (20² - 10²) / (20²)

E = 0.75 = 3/4

Thus, the fraction of the initial kinetic energy is transformed into thermal energy is a function of the change in speed of the baseball.

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The horizontal component of force be 61.28 N.

The definition of force in physics is: The push or pull on a massed object changes its velocity.

An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. The application of force is the location at which force is applied, and the direction in which the force is applied is known as the direction of the force.

Given that:

A gardener is driving a lawnmower with a force of 80N that makes an angle of 40° degree with the ground.

So, horizontal component of force be = 80 cos40° N = 61.28 N.

Hence, the horizontal component of force be 61.28 N.

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The distance of the fish, given that a sound pulse was heard 0.10s later is 148.1 m

Speed is related to distance according to the following formula:

Speed = distance / time

Cross multiply

Distance = speed × time

Using the above formula, we can determine the distance of the fish. Details below:

Distance = speed × time

Distance = 1481 × 0.10

Distance = 148.1 m

Thus, we conclude that the distance of the fish is 148.1 m

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Answer:

Explanation:

10 different sequences

Answer:

it would be 80 would it not

Explanation:

The 40 is just the angle to the normal ray. just multiply it by two giving you 80

The force between the magnet and the can is the noncontact force. The attraction between the magnet and the can is a pull. Therefore, option B and C are correct.

A magnet can be described as a material that produces a magnetic field and this magnetic field is responsible for the properties of a magnet. The properties magnet is such a force that pulls ferromagnetic materials, such as steel, iron, cobalt, etc., towards it.

A permanent magnet can be described as an object made of a material that can be magnetized and creates its own magnetic field. These type of materials are strongly attracted to a magnet, is known as ferromagnetic, and consist of the elements iron, nickel, and cobalt.

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Your question was incomplete, most probably the complete question was,

Mr. wang works in a recycling center recyclable materials arrive at the center mixed together workers use magnets to separate steel cans from other items which two statements are true about the force between a steel can and a magnet:

A) Gravity pushes the can toward the magnet.

B) The force between the magnet and the can is the noncontact force.

C) The attraction between the magnet and the can is a pull

D)  The attraction between the magnet and the can is a push.

The frictional force of an object is the product of the normal force and coefficient of kinetic friction. Here the frictional force acting on the object  is 16.4 N.

Frictional force is a kind of force acting on a body to resist it from motion. Thus, the direction of the force will be in negative with the magnitude. Frictional force is the product of coefficient of friction and the normal force.

The normal  force acting on the object of mass 4.2 Kg is N = mg

N = 4.2 Kg × 9.8 m/s² = 41.16 N

Frictional force = ц N

                         = 0.40 × 41.16 N

                         = 16.4 N.

Therefore, the frictional force acting between the surface of the object and the floor is 16.4 N

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Your question is incomplete. But your complete question probably was:

The coefficient of kinetic friction between an object and the surface upon which it is sliding is 0.40 the weight of the object is 4.2 kg. What is the frictional force of the object?

Once the hydrogen in the core of a star runs out,  then the element, Helium begins to fuse.

Helium begins to fuse, once the core of a star runs out, as helium is then, the only lightest element left in the core of the star.

The energy produced in the fusion processes decreases, as heavier and heavier element starts to fuse. Stars become the main sequence stars after they fuse hydrogen.

Once the hydrogen in the core runs out,  the stars could not hold against gravity more, thereby increasing the pressure and temperature in the core of the star.

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The power loss over the given distance in which the current is carried is 12 MW.

option D is the correct answer.

The current carried in the power line is calculated by applying Ohms law as follows;

V = IR

P = IV

I = P/V

where;

I = (250 x 10⁶) / (230,000)

I = 1,086.96 A

The power loss over the given distance in which the current is carried is calculated as;

P = I²R

where;

P = (1,086.96²) x 10

P = 11.8 x 10⁶ W

P ≈ 12 x 10⁶ W

P = 12 MW

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The mass of the object is equal to 48 Kg if the net force is 60 N.

Acceleration can be defined as the rate at which the object changes its velocity with respect to time. The acceleration is a vector parameter and can be expressed as the second derivative of position w.r.t. time.

The force acting is equal to the multiplication of the mass and acceleration according to Newton's second law of motion.

F = ma

And, a = F/m

Given, the net force acting on an object, F = 60 N

The object is accelerating at a rate, a = 1.25 m/s²

The mass of the object can be calculated by using the given information:

m = F/a

m = 60/1.25

m = 48 Kg

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Answer: Height of object = 29.13475

Hope this helps!

Answer: 29.12 Meters.

Explanation:

It take 1.33 second to a Dalmatian to accelerate from rest to its top speed.

Acceleration is rate of change of velocity with time. Due to having both direction and magnitude, it is a vector quantity. Si unit of acceleration is meter/second² (m/s²).

given parameters:

initial speed, u = 0

final speed, v =16.5 m/s.

distance covered, s = 11 meters.

We have to find: time t = ?

We know that:

s = ut +(v-u)t/2

⇒ 11 = 0 + (16.5 -0)t/2

⇒ t = 22/16.5 second = 1.33 second.

So,  it take 1.33 second to a Dalmatian to accelerate from rest to its top speed.

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It will take 3 sec to stop at the distance of 9 m while declaration.

Deceleration was actually inversely related to acceleration. We know that acceleration means the speed at which the object is accelerating, and deceleration means the speed at which the object is decelerating. For example, when you brake while driving, deceleration is used to slow the vehicle. This is represented by -a. where a is the acceleration.

Time taken to stop:

-a = (v-u)/t

-2 = (0-6)/t

t = -6/2

t = 3 sec.

Distance travelled during this process:

v² = u² + 2as

Since, v =0

s = u²/2a

= (6×6)/(2×2)

= 9 m

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Answer:

The initial angular velocity of the bus wheel:

ω₀  ≈ 15.6 rad / s

Explanation:

Given:

V₀ = 8.22 m/s - Starting speed of the bus

V= 0 m/s - Final speed of the bus (the bus has stopped)

ω = 0 rad/c - Final angular velocity of the bus wheel

t = 13.3 s - Bus deceleration time

R = 0.530 m - Bus wheel radius

____________________

ω₀ - ?  - The initial angular speed of the wheels.

1) Bus linear acceleration module:

a = ( V₀ - V) / t = (8.22 - 0) / 13.3 ≈ 0.62 m/s²

2) Bus angular accelerations module:

ε = a / R = 0.62 / 0.530 ≈ 1.17 rad / s²

3) The initial angular velocity of the bus wheel:

ω₀ = ε·t  = 1.17·13.3 ≈ 15.6 rad / s

In the case described above, there are at least three possible scenarios:

In any of the above cases, the correct step to take, if it is possible is for both scientists to meet, review notes and jointly execute a third investigation. This is because, in science, the guesswork only happens during hypothesis formulation.

Once a principle has been established via experimentation and properly documented, the same research can be replicated in any other location by any other person with the end results being the same if they all follow the exact report documented when the investigation was deemed successful.

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The power used by the dryer to spin the drum and produce heat is 11000 Watts.

Power is simply the quantity of energy transferred per unit time.

This is expressed as;

P = v × I

Where v is voltage and I is current.

Given that;

Plug the given values into the above formula and solve for P.

P = v × I

P = 220V × 50A

P = 11000 Watts

Therefore, the power used by the dry is 11000 Watts.

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The criteria for a successful parachute system are that it must be able to safely land the camera without breaking any of the eggs. The constraints are that the parachute must be made using only string, plastic bags, paper, and fabrics, and the camera must be modeled using a carton of eggs.

One possible model for the parachute system could be a square parachute made of paper or fabric, with strings attached to the corners of the parachute. The camera (represented by the carton of eggs) would be attached to the center of the parachute.

To test the model, we could drop the parachute and camera from a height of one story (or a similar height) and observe whether the eggs break upon landing. If the eggs do not break, the parachute system is considered successful.

After the first test, we could make changes to the design of the parachute (such as changing the shape or size, or adding more strings) and test it again to see if it performs better. We could continue making and testing different designs until we find a parachute system that meets the criteria and constraints.

Answer:

Fossil fuels are energy sources that come directly from nature. First, the sun's radiant energy is stored as chemical energy in plants by photosynthesis. When the plants die, they start decaying. After many years, the plants are turned into fossil fuels.

Explanation:

Fossil fuels rely on the Sun's energy because the energy in fossil fuels came from plants and algae as they performed photosynthesis, which requires sunlight.

When sunlight strikes a plant, some of the energy is trapped through photosynthesis and is stored in chemical bonds as the plant grows.

(u should paraphrase it)

Explanation:

Total frictional force = 500 N

Magnitude of frictional force on 10 kg block = 500 N/3 = 166.67 N

Magnitude of frictional force on 15 kg block = 500 N/3 x 2 = 333.33 N

Direction of frictional force on 10 kg block = Left

Direction of frictional force on 15 kg block = Left

Answer:

D - Water

Explanation:

The water pressure at the bottom of the 54-m-high water tower is

pressure of water at a certain depth is calculated using the formula

Pressure, P = height * density * acceleration due to gravity

density of water is given by = 1000 kg/m³

acceleration due to gravity is given by = 9.82 m/s²

the given height, at the bottom of the 54-m-high water tower  = 54 m

Pressure = 1000 kg/m³ *  9.82 m/s² * 54 m

Pressure = 530280 N/m²

Pressure = 0.53 M N/m²

Pressure = 0.53 M Pa

The pressure at the bottom of the 54-m-high water tower is 0.53 MPa

The unit of pressure used here is Pa which is equal to N/m² other unit include pound - force foot

1 N/m² = 0.73756 pound-force foot

530280 N/m² = 530280 * 0.73756 = 391113.32 pound-force foot

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The horizontal distance travelled by the fish when dropped is 131.25 m.

The time of motion of the fish from the given height is calculated by applying the following kinematic equation as shown below.

h = vt + ¹/₂gt²

where;

h = 0 + ¹/₂gt²

t = √ ( 2h / g )

t = √ ( 2 x 135 / 9.8 )

t = 5.25 seconds

The horizontal distance travelled by the fish when dropped is calculated as;

X = vt

X = 25 m/s  x  5.25 s

X = 131.25 m

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