a driver brings a car to a full stop in 2.0 s. if the car was initially traveling at 22 m/s, what is the acceleration

Answer:

C

Explanation:

Answer:

C

Explanation:

In Sound Navigation and Ranging (SONAR), the sound wave is transmitted through water and it will reflect by hard surfaces. Option B) is correct.

SONAR is used to create nautical charts, find underwater navigation hazards, search for and map things on the seafloor such as shipwrecks and map the seafloor itself, waves are transmitted into the waver and reflected by hard surfaces.

The transmission and receiving of sound waves are involved in active sonar. For example, when a submarine is used to map the topography of the ocean floor.

It emits sound pulses known as pings towards the bottom of the ocean in its area.

Thus, 'Sound is transmitted through water and reflected by hard surfaces is the correct option'.

The question is incomplete. The options are missing in the question. They are A) Sound is transmitted through the water and diffracted by hard surfaces. B) Sound is transmitted through the water and reflected by hard surfaces. C) Sound is diffracted through the water and transmitted by hard surfaces. D) Sound is diffracted through the water and reflected by hard surfaces.

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The current have a uniform speed of 1.35 m/s and let the width of the river be 100 m. what is the speed of the boat relative to a stationary observer on the shore is 67.5 m.

The distance traveled in a unit of time is referred to as speed. The meter per second (m/s) is a SI unit. Any mathematical operation must be performed while maintaining the same units for all terms. If the units are different, the result will be incorrect. Until and unless terms have the same units, we cannot perform mathematical operations on them.

The posed issue is based on the correlation between distance, time, and speed. We must convert km/hr into m/sec in order to convert the specified unit of speed into SI units. The required distance will then be determined using the formula for distance speed and time.

Boat speed in relation to water = 2 m/sec

1.35 meters per second for water

time t = 100/2.00 = 50 s

the required distance = 1.35*50 = 67.5 m

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Answer:

Boiling a kettle is an example of both thermal and kinetic energy. Thermal energy comes from a substance whose molecules and atoms are vibrating faster due to a rise in temperature. Heat energy is another name for thermal energy. Kinetic energy is the energy of a moving object.

it's kinetic!

Answer:

Relative to the ground, the velocity of the aircraft is 240 km/hr

Explanation:

Relative velocity is different from normal velocity;

When 2 objects are moving in opposite directions towards each other, they will appear to be faster than they actually are;

This is known as the relative velocity;

The information tells us we have the aircraft moving 320 km/hr northwards relative to the wind;

The wind is in the opposite direction at 80 km/hr;

R = relative velocity of the aircraft

v = actual velocity of the aircraft

w = velocity of the wind

R = v + w

Note: if the wind was moving in the same direction, the formula would be R = v - w

320 = v + 80

v = 320 - 80

v = 240

The velocity relative to the ground is simply the actual velocity as the ground doesn't move;

So, relative to the ground, the velocity of the aircraft is simply 240 km/hr

Answer:

The total power they will consume in series is approximately 2.257 W

Explanation:

The connection arrangement of the headlight and the engine starter = Parallel to the battery

The voltage of the battery, V = 12.0 V

The power at which the headlight operates in parallel, \(P_{headlight}\) = 38 W

The power at which the kick starter operates in parallel, \(P_{kick \ starter}\) = 2.40 kW

We have;

P = V²/R

Where;

R = The resistance

V = The voltage = 12 V (The voltage is the same in parallel circuit)

For the headlight, we have;

R₁ = V²/\(P_{headlight}\)  = 12²/38 = 72/19

R₁ = 72/19 Ω

For the kick starter, we have;

R₂ = V²/\(P_{kick \ starter}\) = 12²/2.4 = 60

R₂ = 60 Ω

When the headlight and kick starter are rewired to be in series, we have;

Total resistance, R = R₁ + R₂

Therefore;

R = ((72/19) + 60) Ω = (1212/19) Ω

The current flowing, I = V/R

∴ I = 12 V/(1212/19) Ω = (19/101) A

We note that power, P = I²R

In the series connection, we have;

\(P_{headlight}\) = I² × R₁

∴ \(P_{headlight}\) = ((19/101) A)² × 72/19 Ω = 1368/10201 W ≈ 0.134 W

The power at which the headlight operates in series, \(P_{headlight, S}\) ≈ 0.134 W

\(P_{kick \ starter}\) = ((19/101) A)² × 60 Ω = 21660/10201 W ≈ 2.123 W

The power at which the kick starter operates in series, \(P_{kick \ starter, S}\) ≈ 2.123 W

The total power they will consume, \(P_{Total}\) = \(P_{headlight, S}\) + \(P_{kick \ starter, S}\)

Therefore;

\(P_{Total}\) ≈ 0.134 W + 2.123 W = 2.257 W

Answer:

every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.

Explanation:

Answer:

1.08 x 10⁷N

Explanation:

Given parameters:

Mass of freight train  = 270700kg

Acceleration = 40m/s²

Unknown:

Force acting on the train = ?

Solution:

From Newton's second law of motion, we know that:

       Force  = mass x acceleration

So;

        Force  = 270700 x 40   = 1.08 x 10⁷N

The main reason to suspect that Enceladus has a subsurface ocean of water is the presence of geysers erupting from its southern polar region.

The Cassini spacecraft detected plumes of water vapor, ice particles, and organic molecules coming from the moon's surface, indicating the presence of a liquid water ocean beneath the icy crust. This discovery has led to the hypothesis that Enceladus could potentially harbor life in its subsurface ocean.

Enceladus, one of Saturn's moons, has a subsurface ocean of water is due to the presence of cryovolcanism, observed geysers, and the detection of water vapor and ice particles in its plumes. These factors provide strong evidence for the existence of liquid water beneath the icy surface of Enceladus.

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The plane travels a distance of 325 miles if the airplane travels for 2.5 hours at an average speed of 130 miles per hour. Using the distance formula (d = rt), we can calculate the distance.

To find the distance traveled by the airplane, we can use the distance formula, which is represented as d = rt. In this formula, "d" represents the distance, "r" represents the rate or speed at which the object is traveling, and "t" represents the time taken for the travel.

Given that the airplane travels for 2.5 hours at an average rate of 130 miles per hour, we can substitute these values into the formula. The rate of the airplane is 130 miles per hour, and the time taken is 2.5 hours.

Using the formula, we can calculate the distance traveled as follows:

d = rt

d = 130 mph × 2.5 hours

Multiplying the rate (130 mph) by the time (2.5 hours) gives us:

d = 325 miles

Therefore, the airplane travels a distance of 325 miles during the 2.5 hours of travel at an average rate of 130 miles per hour.

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Based on the terms provided, the method that was not among the three methods of ionizing a sample discussed in the reading is, b) placing the sample in a gel and hitting it with a laser

Let's talk about the techniques that were mentioned:

a) Bombarding the sample with a high-energy electron beam: In this technique, the sample is bombarded with an electron beam of high energy. The high-energy electrons can transfer enough energy when they strike the sample to ionize it by removing an electron from an atom or molecule. Both electron impact ionisation and electron ionisation mass spectrometry frequently employ this method.

b) Laser-assisted matrix-assisted laser desorption/ionization (MALDI), which is a common technique in mass spectrometry, is used to hit the sample inside a gel. The sample is combined with a matrix substance and applied to a target in MALDI.

c) Placing the sample close to a lightning rod's extremely sharp conducting tip and strong electric field: Field ionisation or field desorption are two terms for this technique. It entails producing a strong electric field close to a pointed conducting tip, which might cause the phenomena of field ionisation to cause the ionisation of adjacent molecules. Both field ionisation mass spectrometry and field desorption mass spectrometry employ this method.

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The absorption of energy occurs in endothermic reactions. The correct option is D.

The type of chemical reaction that results in the absorption of energy is endothermic. In an endothermic reaction, energy is absorbed from the surroundings, resulting in an increase in the internal energy of the system.

This means that the products of the reaction have more energy than the reactants, and the reaction requires an input of energy to proceed.

Examples of endothermic reactions include the reaction of baking soda and vinegar, the melting of ice, and the reaction of ammonium nitrate and water.

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If a ball is given a push so that it has an initial velocity of 2 m/s down a certain inclined plane, then the distance it has rolled after t seconds is s = 2t + t². Then it takes 11 seconds for the velocity to reach 24 m/s. The correct option is D.

To find the time it takes for the velocity of the ball to reach 24 m/s, we need to solve for the time when the velocity function equals 24 m/s.

The velocity function is the derivative of the distance function, so we'll first find the derivative of the distance function s = 2t + t² with respect to time t:

ds/dt = d/dt(2t + t²)

ds/dt = 2 + 2t

Now we can set the velocity function equal to 24 m/s and solve for t:

2 + 2t = 24

Subtracting 2 from both sides:

2t = 22

Dividing both sides by 2:

t = 11

Therefore, it takes 11 seconds for the velocity to reach 24 m/s.

The correct answer is (d) 11 seconds.

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Answer:

5 m/s²

Explanation:

Acceleration = change in speed/time taken

20-5=15

15/3= 5 m/s²

Answer:

A.add the forces

Explanation:

since they're both going in the same direction then they should be added to get the total net force.

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The net force acting on the airplane if, An airplane is flying at 80 kilometers per hour when a strong tailwind, traveling in the same direction at 5 kilometers per hour is 85 km/hr so, option A is correct.

Force is the influence of either pull or pushes in the body. Basically, gravitation forces, nuclear forces, and friction forces are the types of forces.

For e.g. when the wall is hit by a hand then a force is exerted by the hand on the wall as well as the wall also exerts a force on the hand. There are different laws given to Newton to understand force.

Given:

An airplane is flying at 80 kilometers per hour when a strong tailwind, traveling in the same direction at 5 kilometers per hour,

Calculate the net force acting on the airplane as shown below,

The net force acting on the airplane = The velocity of the airplane + velocity of the wind  (As they both are in the same direction)

The net force acting on the airplane = 80 km / hr + 5 km / hr

The net force acting on the airplane = 85 km / hr

Thus, the net force acting on the airplane is added.

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Answer:

metal conducts heat faster than wood. which means the metal conducted heat away from your hand (or whatever it is) faster than wood.

Explanation:

just because they feel warm/cold doesn't always mean that it is warm/cold. if they both were sitting at room temp for a long time, then both will eventually reach the temp of the room. even though they are the same temp the metal will feel colder than the wood because of the thermal conductivity of the metal compared to the wood.

The different thermal conductivities of metal and plastic are important in the design of the bowl is metal conducts heat faster than Plastic. which means the metal conducted heat away from your hand (or whatever it is) faster than Plastic.

Thermal conductivity can be defined as the degree to which heat is transmitted through the cross-section of the unit of an object, where the temperature exits directly across the surface.

Electrical conductivity is a measure of how much energy (moving charge) can pass through objects under the influence of a used electric field. Thermal conductivity measures how heat (heat moving energy) can pass through objects below temperature differences.

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Yes, the net force on an object and the acceleration of the object are directly proportional, as shown by experimental data and supported by Newton's second law of motion.

According to Newton's Second Law of Motion, the net force on an object and its acceleration are exactly related. According to this rule, an object's acceleration is inversely related to its mass and directly proportionate to the net force acting on it. The validity of the law has been shown by data from several tests that have repeatedly proven this link. One illustration of such an experiment is measuring the force necessary to accelerate an item using a spring scale. The link between force and acceleration may be determined by applying various forces and observing the resulting acceleration.

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There is 16 m gap between the deer and the car.

We know that the acceleration is the rate of change of the velocity with time. Let us recall that the acceleration is a vector quantity and the direction is important here. Now, we have the following;

Initial velocity = 21 m/s

Final velocity = 0 m/s

Acceleration = 10 m/ s 2

Distance = 38 m

Given that we want to obtain the distance, we have to use;

V^2 = u^2 - 2as

Now v = 0 m/s because the object comes to a stop

v = final velocity

u = initial velocity

a = acceleration

s = distance covered

s = u^2 /2a = ( 21 m/s)^2/ 2 * 10 m/ s 2

= 22  m

The distance that is left between you and the deer = 38 m -  22  m = 16m

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The creating a graph of motion down a ramp and linearizing it, plotting acceleration versus sin(theta), the slope of the line represents the acceleration due to gravity. the graph has a practical and significant meaning in physics and engineering.

This is because the gravitational force is the only force acting on the object as it rolls down the ramp, so the acceleration of the object is directly proportional to the force of gravity acting upon it. Therefore, the slope of the line represents the value of acceleration due to gravity, which is approximately 9.8 m/s^2 on the Earth's surface. This value is a fundamental constant in physics and has practical significance in many areas of science and engineering. Knowing the value of acceleration due to gravity is crucial in designing structures, calculating trajectories of objects in motion, and understanding the behavior of various physical systems. Hence, the slope of the acceleration versus sin(theta) graph has a practical and significant meaning in physics and engineering.

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The weight of the super ball is 0.00224 oz.

To determine the weight of the super ball in U.S. customary units, we first need to calculate its volume. We can use the formula for the volume of a sphere: V = 4/3 * pi * r^3, where r is the radius of the sphere (half the diameter). In this case, the radius is 3.5 cm.

So, V = 4/3 * pi * \((3.5 cm)^3\)= 4/3 * pi * 42.875 \(cm^3\)

Next, we can use the density of section (1.5\(mg/m^3\)) and the volume of the sphere to calculate the weight of the super ball.

Weight = Density * Volume

The weight of the super ball will be approximately:

Weight = 1.5 \(mg/m^3\) * 42.875 \(cm^3\) = 63.8125 mg

Converting to ounces:

63.8125 mg = 0.00224 oz

Therefore, The weight of the super ball is 0.00224 oz.

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The graph shown in the first option nicely plots the lion's and gazelle's velocities as a function of time, so option A is the correct answer.

Velocity is the rate of change of displacement over time.

As mentioned in the problem of running at a constant speed towards a gazelle with a standing lion as shown above.

So option A is correct.

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Answer:

6.39*(10 to the 23rd)=

6.39*10²³

Answer:

0.3937008

Explanation:

Answer: 1 centimeter is your answer

I apoligize that this is a late answer , I stumbled upon this post. Good luck to any future veiwers. P.S the picture below is for a similiar question for other students who pressed this post

Answer:

2

Explanation:

just took the assignment

The pressure exerted by oil of density of density 900kg has to be calculated when the height of liquid column is 12 meter, is 1.06×10⁶ Pa.

Pressure is the force applied perpendicular on the surface of the object per unit its area, where the force is distributed. The formula of pressure can be given as,

\(p=\rho \times g \times h\)

Here, \(\rho\) is the density of fluid, g is the gravitational acceleration and h is the height.

The pressure exerted by oil of density of density 900kg has to be calculated.  The height of liquid column is 12 meter.​ Put the values in the above formula,

\(p=\rho \times g \times h\\p=900 \times 9.81 \times 12\\p=105948\\p\approx1.06\times10^5\rm\; pa\)

Thus, the pressure exerted by oil of density of density 900kg has to be calculated when the height of liquid column is 12 meter, is 1.06×10⁶ Pa.

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You walk down the hall for 20 m in 30 seconds, stop for 60 seconds to talk to your friend, and then walk to class another 10 m in 10 seconds. The average speed will be 0.3 m/s

total time = 30 + 60 + 10 = 100 seconds

distance = 20 + 10 = 30 m

average speed = distance / time = 30 / 100

                          = 0.3 m/s

The average speed will be 0.3 m/s

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(a) The angle made by the vector v with the positive x-axis is approximately 60.66 degrees, and the angle made with the positive y-axis is approximately 29.34 degrees.

(b) The unit vector n in the direction of v is approximately (-0.49)i + (-0.87)j.

To determine the angles made by the vector v = (-32)i + (-57)j with the positive x- and y-axes, we can use trigonometry.

The angle made by the vector with the positive x-axis (θx) can be found using the arctan function:

θx = arctan(Vy/Vx)

where Vx is the x-component of the vector and Vy is the y-component of the vector.

Given Vx = -32 and Vy = -57, we can substitute these values into the equation:

θx = arctan((-57) / (-32))

θx ≈ 60.66 degrees

The angle made by the vector with the positive y-axis (θy) is given by:

θy = 90 degrees - θx

θy = 90 - 60.66 ≈ 29.34 degrees

Therefore, the angle made by the vector v with the positive x-axis is approximately 60.66 degrees, and the angle made with the positive y-axis is approximately 29.34 degrees.

To write the unit vector n in the direction of v, we divide the vector v by its magnitude:

n = v / |v|

The magnitude of v can be found using the Pythagorean theorem:

|v| = √(Vx^2 + Vy^2)

|v| = √((-32)^2 + (-57)^2)

|v| = √(1024 + 3249)

|v| ≈ √4273

|v| ≈ 65.36

Substituting the components and magnitude, we can write the unit vector n as:

n = (-32/65.36)i + (-57/65.36)j

Simplifying, we have:

n ≈ (-0.49)i + (-0.87)j

Therefore, the unit vector n in the direction of v is approximately (-0.49)i + (-0.87)j.

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