Davien and Jackson are headed to a beach that is 50km from school. At noon, Davien leaves his house that is 10 km closer to the beach than the school is and moves at 40 km/h. Jackson starts from school at 12:30 P.M. And moves at 100 km/h. What time does Davien reach the beach? * Answer Format: Time

Answer:

Explanation:

18 km / h

= 300 m / min

12 km / h = 200 m / min

distance travelled in 200 minutes = 300 x 200 = 60000 m

distance travelled in 50 minute in return journey = 200 x 50 = 10000 m

total distance travelled = 70000 m

total time = 250 minute

speed = 70000 / 250

= 280 m / min

= 16.8 km / h

Total displacement = 60000 - 10000 = 50000 m

total time = 250 min

velocity = 50000 / 250

= 200 m / min

= 12 km / h

Answer:

0.20 G

Explanation:

The given parameters are;

The magnetic field strength of planet X = 0.70 G

The location of a probe in relation to the vertical wire = 50 m

The measurement of a probe placed 50 mm east of a vertical wire = 0.50 G

The location of the probe = 20 mm east of the vertical wire

Based on the given parameter,  the wire is a current carrying conductor with a magnetic field acting tangent to the magnetic field lines.

Given that the measured Earth magnetic field reduces, we have that the magnetic field of the wire cancels the magnetic field of the Earth

As the probe moves closer to the wire the measured magnetic field in the southern direction reduces

When the probe is placed 20 mm from the wire, the magnetic field reduces to 20/50 × 0.50 G = 0.20G

Answer:

Energy conversion

Explanation:

We regularly use automobile which runs on the chemical energy of the fuels such as diesel and petrol, the chemical energy from the fuel would convert into the thermal energy which is used to drive the engine of the vehicle,further the thermal energy converted into the mechanical energy which is used to drive the prime mover of the automobile.

It can be defined as the form of the energy in which heat is transferred from one body to another body due to their molecular movements, thermal energy is also known as heat energy.

We frequently utilize vehicles that operate on chemical energy from fuels like diesel and gasoline.

This chemical energy is transformed into thermal energy, which drives the engine of the vehicle, and then mechanical energy, which drives the prime mover of the vehicle.

Thus, we can say that the transfers and transformations of energy are necessary to operate the technology.

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The magnitude of the frictional force between the sled and the snow is 46.3 N.

We are given that the pulling force has a horizontal component of 21 N and a vertical component in the upwards direction of 25 N. Using this information, we can calculate the magnitude of the pulling force as follows:

Magnitude of the pulling force = √((21 N)² + (25 N)²)

= √(441 N² + 625 N²)

= √(1066 N²)

= 32.7 N

To calculate the force of friction, we first need to calculate the net force. We can do this by finding the difference between the pulling force and the weight of the sled and child:

Net force = Magnitude of the pulling force - Weight of the sled and child

= 32.7 N - 79 N

= -46.3 N

Now, we know that this net force is equal to the force of friction:

Force of friction = Net force

= -46.3 N

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Answer:

b

Explanation:

the different ways the molecules are arranged in the atom creates differ states of matter and different appearences.

Option B

Note that the current generated by an AC generator is an alternating current.

An alternating current is one which continually changes its polarity. That is, it oscillates and changes its magnitude and direction

Based on the points stated above, we can describe the current generated by an AC generator as a current that oscillates direction and magnitude between 0 and maximum.

This means that an alternating current does not only change its direction, it changes its magnitude too.

Answer:

definition of matter is that matter takes up space and has mass

Answer:

i cant see it just put the question

Explanation:

The magnetic field on Earth is due primarily to iron and nickel sinking into the core. Option A is correct.

A magnetic field is a region in space where a magnetic force is experienced by a magnetic object or a moving charged particle. It is created by the motion of electric charges, such as electrons in atoms, or the movement of current in a wire.

The Earth's core is composed mainly of iron and nickel, and the movement of these metals in the liquid outer core generates a magnetic field through a process known as dynamo action.

The flow of liquid metal in the outer core generates electric currents, which in turn create the magnetic field that surrounds the Earth. This magnetic field is important for protecting the Earth from harmful solar radiation and is also responsible for phenomena such as the aurora borealis.

Hence, A. is the correct option.

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Answer:

remove the danger that lead to injury

Explanation:

The best way is

Answer:

A

Explanation:

The angular velocity of the second hand is the highest among the three hands, followed by the minute hand, and then the hour hand.

To calculate the angular velocity (in rad/s) of the second, minute, and hour hands on a wall clock, we need to use the formula:

Angular velocity (in rad/s) = Angular displacement (in radians) / Time taken (in seconds)

For the second hand:

The second hand completes one full rotation in 60 seconds, which is 2π radians.

Therefore, the angular velocity of the second hand = 2π radians / 60 seconds = 0.1047 rad/s

For the minute hand:

The minute hand completes one full rotation in 60 minutes, which is 2π radians.

Therefore, the angular velocity of the minute hand = 2π radians / 3600 seconds = 0.0009 rad/s

For the hour hand:

The hour hand completes one full rotation in 12 hours, which is 2π radians.

Therefore, the angular velocity of the hour hand = 2π radians / (12 * 3600) seconds = 0.0001 rad/s

So, the angular velocity of the second hand is the highest among the three hands, followed by the minute hand, and then the hour hand.

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The output work done by the lever is 18.9 J.

Output work is the product of laod and the distance moved by load.

The S.I unit of output work is Joules (J).

To calculate the output work done by the lever, we use the formula below,

Formula:

Where:

Make W' the subject of the equation

From the question,

Given:

Substitute these values into equation 2

Hence, the output work done by the lever is 18.9 J.

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1. The magnitude of the bicyclist's acceleration is 4.09 m/s²

2. The distance travelled by the bicyclist during the time is 39.6 m

1. How to determine the acceleration

We can obtain the acceleration of the bicyclist as illustrated below:

a = (v – u) / t

a = (18 – 0) / 4.40

a = 18 / 4.40

a = 4.09 m/s²

Thus, the acceleration of the bicyclist is 4.09 m/s²

2. How to determine the distance travelled

The distance travelled by the bicyclist can be obtained as       follow:        

v² = u² + 2as

18² = 0² + (2 × 4.09 × s)

324 = 0 + 8.18s

324 = 8.18s

Divide both side by 8.18

s = 324 / 8.18

s = 39.6 m

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The weight is 1300 N of a probe of mass 50 kg at Jupiter's surface

The weight of an object is the force exerted on it by gravity, which is given by the product of its mass and the acceleration due to gravity.

At Jupiter's surface, the surface gravity is about 26 newtons per kilogram. So, the weight of a probe of mass 50 kg at Jupiter's surface would be:

Weight = Mass x Acceleration due to gravity

Weight = 50 kg x 26 N/kg

Weight = 1300 N

Therefore, the weight of a probe of mass 50 kg at Jupiter's surface would be 1300 Newtons.

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The speed of the moving train is approximately 33.5 m/s.

The beat frequency is given by the difference in frequency between the two horns, which is equal to the Doppler shift in frequency due to the motion of the moving train. Using the formula for the Doppler effect, we can solve for the speed of the train:

\(f_b = f_s\dfrac{(v + v_o)}{(v + v_s)}\)

where \(f_b\) is the beat frequency, \(f_s\) is the horn frequency, v is the speed of sound, \(v_o\) is the observer's speed, and \(v_s\) is the speed of the source.

We know that \(f_s\) = 410 Hz and \(f_b\) = 35 Hz. The speed of sound in air at standard temperature and pressure is approximately 343 m/s. Since the observer is stationary, \(v_o\) = 0.

Solving for \(v_s\), we get:

\(v_s = \dfrac{(f_s + f_b)}{f_s - 1} \times v\)

\(v_s\) = ((410 Hz + 35 Hz) / 410 Hz - 1) * 343 m/s

\(v_s\) = 33.5 m/s

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Answer: 1000 Hz · 0,5 m = 500 m/s

Explanation: speed = frequency · wavelength

Answer:

1. D - 3.6 x 10^4 J

2. D - 0.04

3. A - 30.3 m/s

4. C - 3.67 x 10^8 J

5. A - 38.6 m

6. C - 7.07 m/s

7. B - 4.21 g

8. B - -6.56 J

9. A - 65 m/s

10. B - 116 Days

Answer:

- maintain its state of motion

- Keep its velocity constant (either at zero or non-zero value)

Answer:

Explanation:

Projectile Motion. Projectile motion is different than free fall: it involves two dimensions instead of one. ... Balls traveling in two dimensions, only one of which experiences acceleration, require two sets of equations: one set for the x-direction and the other for the y-direction.

Answer:

18 m

1.1 s

Explanation:

Given:

v₀ = 22 m/s

v = 11 m/s

a = -10 m/s²

Find: Δy

v² = v₀² + 2aΔy

(11 m/s)² = (22 m/s)² + 2 (-10 m/s²) Δy

Δy ≈ 18 m

Find: t

v = at + v₀

11 m/s = (-10 m/s²) t + 22 m/s

t = 1.1 s

On a particular day the atmospheric pressure is 1. 02*100000. The density of mercury is 13600 kg/m3. Then the value of h indicated by the barometer is 0.7594 m.

On a particular day the atmospheric pressure is 1.02 * 100000. The density of mercury is 13600 kg/m³. We need to calculate the value of h indicated by the barometer.Let's first understand what is barometer. A barometer is an instrument that is used to measure atmospheric pressure, commonly used in weather forecasting and meteorology. There are two types of barometers: mercury and aneroid barometer.

A mercury barometer uses mercury which is placed in a long glass tube, where one end of the tube is closed and filled with the mercury, and the other end is exposed to the atmosphere. Due to the atmospheric pressure, mercury rises in the tube. The height of the mercury column indicates the atmospheric pressure. Let's apply this concept to solve the given question .h = (p / (ρ * g))where p = atmospheric pressure = 1.02 * 10^5 N/m²ρ = density of mercury = 13600 kg/m³g = acceleration due to gravity = 9.8 m/s²h = (1.02 × 10^5) / (13600 × 9.8)≈ 0.7594 m

Therefore, the value of h indicated by the barometer is 0.7594 m.

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Answer:

C. Pulmonary endurance

Explanation:

I'm pretty sure it's "C" because cardiovascular and pulmonary endurance are the same thing and usually you'd hear cardiovascular more than pulmonary.

Sorry if I'm wrong!

Answer:

c

Explanation:

i just took the test

The acceleration of the elevator at this time was 2m/s² and the elevator was accelerating the upward direction.

The mass of the child standing on a spring scale in an elevator is 30 kg the elevator is showing a reading of 360 Newtons.

The reading note by the elevator is given by radiation,

W = M(g+a)

Where w is the reading of the spring scale,

M is the mass of the child,

g is the gravitational acceleration which is given to be 10m/s² and a is the acceleration of the elevator.

Putting values,

360 = 30(10+a)

12 = 10+a

a = 2m/s²

As you can see from the above result that the acceleration of the lift is 2m/s² and because it is positive it means that the elevator is accelerating in the upward direction.

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In Florida, beaches are eroding at an increasing rate. Because natural vegetation is crucial for supporting the sand, clearing it off beaches may cause erosion to worsen.

The department's Coastal Construction Control Line (CCCL) Program safeguards coastal resources from erroneously placed and designed buildings and activities that could cause erosion, undermine the stability of the beach and dune system, expose upland property to storm damage, or obstruct public access.

There are more than 1,000 miles of beaches in Florida alone. All residents who live along the coast face a high risk of coastal erosion due to the state's practically complete coastline.

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Answer:

The sound waves from a radio speakers

Explanation:

Answer:

96500÷5=19300

Explanation:

96500÷5=19300

(a) The magnetic field in the solenoid is 0.048 T. (b) The energy density is 1.38 × 10⁻⁶ J/m³. (c) The total energy in the coil's magnetic field is 0.167 J. (d) The inductance of the solenoid is 1.63 × 10⁻⁴ H.

(a) The magnetic field in the solenoid can be calculated using the formula: Magnetic field in the solenoid, B = μ₀NI/l

l is the length of the solenoid,

A is the area of the cross-section of the solenoid,

N is the number of turns of the solenoid wire,

I is the current flowing through the solenoid

Substituting the given values, we get:

B = (4π×10⁻⁷ T m/A)(460 turns)(90 A)/(0.24 m)

B = 0.048 T

(b) The energy density in the magnetic field if the solenoid is filled with air can be calculated using the formula:

Energy density in the magnetic field, u = ½μ₀B²

u is the energy density in the magnetic field

B is the magnetic field of the solenoid

Substituting the given values, we get

u = ½ (4π×10⁻⁷ T m/A) (0.048 T)²

u = 1.38 × 10⁻⁶ J/m³

(c) The total energy contained in the coil's magnetic field (assuming that the field is uniform) can be calculated using the formula:

Total energy contained in the coil's magnetic field, U = ½L I²

L is the inductance of the solenoid,

I is the current flowing through the solenoid

Substituting the given values, we get

U = ½(μ₀n²A l) I²

U = ½(4π×10⁻⁷ T m/A) (460 turns)² (0.540 cm²) (0.24 m) (90 A)²U = 0.167 J

(d) The inductance of the solenoid can be calculated using the formula:

Inductance of the solenoid, L = μ₀n²A l / L

μ₀ is the permeability of free space

N is the number of turns of the solenoid wire

I is the current flowing through the solenoid

Substituting the given values, we get

L = (4π×10⁻⁷ T m/A) (460 turns)² (0.540 cm²) (0.24 m) / (0.24 m)L = 1.63 × 10⁻⁴ H

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The people outside of a plane do not hear the same sound volume as those inside the plane. the nuclear volume of the sound outside the plane is likely to be much lower and may not cause the same level of discomfort or hearing damage.

The sound waves are inside an enclosed space like a plane cabin, they bounce off the walls and ceiling, which can amplify the volume of the sound. On the other hand, when sound waves are outside, they can disperse in all directions, and the distance between the source of the sound and the listener can affect how loud the sound is perceived. Another factor that affects the nuclear volume of sound inside and outside a plane is the type of sound. For example, the sound of the engines is likely to be much louder outside the plane, while other sounds like conversations may be louder inside the cabin. In general, the sound volume inside a plane can be quite high, especially during takeoff and landing, and it is important for passengers to protect their hearing by using earplugs or noise-cancelling headphones. However, the volume of the sound outside the plane is likely to be much lower and may not cause the same level of discomfort or hearing damage.

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Answer:

G M m / R^2      attraction of Jupiter to sun where m is mass of Jupiter

m V^2 / R      centripetal force acting on Jupiter

R = G M / V^2

The radius would be unchanged, and its orbit would be unchanged