1. How far from the home did Karen and her mother travel during the first hour of the trip?
2. Calculate the average speed of the car during the first hour of the trip.
3. How far did Karen and her mother travel during the second hour of the trip?
4. Calculate the average speed of the car during the first two hours of the trip.
5. Identify the time period(s) during the trip when the car was traveling at the greatest average speed.
6. Identify the time period(s) during the trip when the car was stopped.
7. Calculate the average speed of the car for the first three hours of the trip.
8. If Karen and her mother take three hours to come home, calculate the average speed of the car for the trip home.
Answers
2). (40 miles) / (1 hour) = 40 mph
3). The distance doesn't change during the second hour.
They didn't travel at all during that hour.
4). Average speed = (distance covered) / (time to cover the distance)
= 40 miles / 2 hours
= 20 mph during the first 2 hours
5). The greatest average speed is the period where the graph
has the steepest slope. That's during the first hour.
6). The car was stopped during the whole 2nd hour and the whole 5th hour.
7). At the end of 3 hours, the graph has moved up to 60 miles.
The average speed during those 3 hours is
(60 miles) / (3 hours) = 20 mph .
8). The farthest away from home they ever got was 76 miles.
If they take 3 hours to return, over the same route, then their
average speed on the return will be
(76 miles) / (3 hours) = (25 and 1/3) miles per hour.
Related Questions
Using the scientific definition of work, does a greater amount of force always result in a greater amount of work? Why or why not? ...?
Answers
Using the scientific definition of work, a greater amount of force does not always result in a greater amount of work because work done is the result of the force applied and the displacement of that object.
What is the significance of the work done?The work done on an object when the object shows the displacement with respect to the force applied to it and If the force is applied in the same direction as the displacement, work is done on the object, and the work done is equal to the force multiplied by the displacement. The greater force does not show the greater amount of work, as the work done has different factors that it depends upon.
Hence, using the scientific definition of work, a greater amount of force does not always result in a greater amount of work because work done is the result of the force applied and the displacement of that object.
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why are the places with high temperature found at the equator ?
Answers
the most direct solar rays for the most amount of time.
BUT . . .
The places on Earth where the highest temperatures have been
recorded are NOT on the equator.
Because of friction,
A.energy is not always conserved
B.NOT all potential energy is converted to kinetic energy
C.all of an object's kinetic energy turns into potential energy
D.all of an object's potential energy turns into kinetic energy
Answers
A main sequence star cools and expands. It must be entering which stage?
A. white dwarf
B. black dwarf
C. red giant
D. neutron star ...?
Answers
What might you have if you dont feel well?
Answers
To calculate the wavelength of a wave, take the wave speed and divide by the frequency of the wave. true or false
Answers
You said Wavelength = (speed) / (frequency)
Yes, that's a valid equation.
TRUE
Which can have either a positive charge or a negative charge when they are released during radioactive decay?
Answers
Answer: B on edg
Explanation:
A doctor estimates that a particular patient is losing bone density at a rate of 3% annually. The patient currently has a bone density of 1,500 kg/mg3. The doctor writes an exponential function to represent the situation. Which values should the doctor use for a and b in a function written in the form f(x) = abx, where f(x) represents the bone density after x years?
a =
b =
Answers
a = 1,500 kg/m³
b will be decrease factor so:
1 - 3%
b = 0.97
a will be the initial amount so:
a = 1,500 kg/m³
b will be decrease factor so:
1 - 3%
b = 0.97
Calculate the time in which a tuning fork of frequency 256 Kz. completes 32 vibrations?Answer needed urgently. Pl. help. Thanks ! ...?
Answers
t = nT = n/f = 32/256 = 1/8 = 125 ms.
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The purpose of your physics lab is to determine the specific heat of a small metal cylinder. You and your group will use calorimetry, along with a ___________ probe and the law of heat exchange, to calculate specific heat of the metal.
Answers
The difference in temperature is needed for this experiment.
Answer:
temperature probe
Explanation:
what is the energy of 1 mole of light that has wavelength 400nm? ...?
Answers
Energy of a given wavelength of light is given by:
E = nhc/λ; where n is the number of photons, h is the Planck's constant, c is the speed of light and λ is the wavelength.
E = (6.02 x 10²³ x 6.63 x 10⁻³⁴ x 3 x 10⁸) / (400 x 10⁻⁹)
E = 299.3 kJ
Why is the weight of an object more on earth than on the mood ?
A.the mood is a satellite of earth
B. The gravitational pull of the mood is greater than of earth
C. The gravitational pull of earth is greater than that of the moon
D. The objects mass is different on earth and on the moon
Answers
And your answer is C. If objects weigh more one one planet than the other, that planet has stronger gravitational pull.
Answer: C.
The gravitational pull of Earth is greater than that of the Moon.
Explanation: plato :3
what is interfacial polarisation ...?
Answers
When gases, liquids, or solids are in contact with a moving object, the flow of _____ occurs due to frictional forces
Answers
heat is produced due to friction.
When gases, liquids, or solids are in contact with a moving object, the flow of _____ occurs due to frictional forces.
The answer is HEAT
This is becuase when objects flow against friction energy is rubbed with friction causing surfaces to heat from the molecules rubbing.
does centripetal force change in uniform circular motion?
Answers
The centripetal force in uniform circular motion remains constant as long as the object's mass and velocity don't change, since centripetal force is calculated as the mass times centripetal acceleration (Fc = mac).
In uniform circular motion, the centripetal force must remain constant to maintain the motion. The second law of motion given by Newton states that net force is mass times acceleration: net F = ma. We have centripetal acceleration (a = ac) for uniform circular motion, and consequently, Fc, the magnitude of centripetal force is Fc = mac. This equation implies that as long as the mass of the object and its velocity (which together determine ac) remain constant, the centripetal force will also remain constant. It is this force that maintains the object in a circular path, acting towards the center of curvature and altering the direction of the object without changing its speed.
It's important to note that centripetal force is not a particular type of force; rather, it could be provided by any force or combination of forces that act towards the center of the object's circular path, like gravitational force, tension, friction, or any other appropriate force that can cause the required centripetal acceleration for uniform circular motion.
What is the basis for analyzing an energy transfer diagram? The mechanical energy input and output must be equal. Heat must always be the largest output. The sum of all outputs must equal the input. Electrical energy is an input but not an output.
Answers
Answer:
The sum of all outputs must equal the input.
Explanation:
what must be true of a force that causes an object to move in a circular motion
Answers
toward the center of the circle.
Answer:
The correct answer is: It acts perpendicular to the velocity and is directed toward the center of the circle.
Explanation:
The Centripetal Force is when an object that describes a circular path has the feeling that it is carried inside the center of the circumference described. This indicates that the centripetal force acts with attraction on the body, indicating the directions that it must take.
In other words, the centripetal force is the force that acts on a moving object on a curvilinear path, and that is directed towards the center of path curvature.
When the object moves in a curvilinear direction, the centripetal force will always act perpendicular to the known direction, that is, it always acts perpendicular to the direction of movement of the body on which it is applied.
Given all this, it is possible to say that the correct answer is: It acts perpendicular to the velocity and is directed toward the center of the circle.
A hollow cylinder of mass M and radius R rolls down an inclined plane. a block of mass M slides down an identical inclined plane. if both objects are released at the same time,
a) the cylinder will reach bottom first
b)the block will reach the bottom first
c) the block will reach the bottom with greater kinetic energy
d) the cylinder will reach bottom with greater kinetic energy
e) the block and the cylinder will reach the bottom at the same time. ...?
Answers
Based on the experiment, the cylinder will reach bottom first.
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A particular frost-free refrigerator uses about 710kWh of electrical energy per year. Express this amount of energy in J, kJ, & Cal.
Answers
Final answer:
To convert the energy usage of a refrigerator from kWh to J, kJ, and Cal, we multiply by appropriate conversion factors. The refrigerator uses 2.556 × 10^9 J, 2.556 × 10^6 kJ, and approximately 610,868 Cal per year. At an electricity cost of $0.15 per kWh, it costs $106.50 per year to run.
Explanation:
To answer the question on how to convert the annual energy usage of a frost-free refrigerator from kilowatt-hours (kWh) to Joules (J), kilojoules (kJ), and Calories (Cal), we can use the following conversion factors:
1 kWh = 3.6 × 10^6 J (Joules)
1 J = 0.001 kJ (kilojoules)
1 Cal = 4.184 kJ (the food Calorie, with a capital 'C', is equivalent to a kilocalorie)
Now, we will convert the 710 kWh/year:
To Joules: 710 kWh × 3.6 × 10^6 J/kWh = 2.556 × 10^9 J
To kilojoules: 2.556 × 10^9 J × 1 kJ/1000 J = 2.556 × 10^6 kJ
To Calories: Using the relationship between kJ and Cal: 2.556 × 10^6 kJ / (4.184 kJ/Cal) ≈ 610,868 Cal
The cost to run such a refrigerator at a typical electricity cost of $0.15 per kWh can be calculated as follows:
Annual Cost = 710 kWh/year × $0.15/kWh = $106.50/year
What is transferred by electromagnetic waves?
Answers
Two basketball players are essentially equal in all respects. (They are the same height, they jump with the same initial velocity, etc.) In particular, by jumping they can raise their centers of mass the same vertical distance, (called H their "vertical leap"). The first player, Arabella, wishes to shoot over the second player, Boris, and for this she needs to be as high above Boris as possible. Arabella jumps at time , and Boris jumps later, at time (his reaction time). Assume that Arabella has not yet reached her maximum height when Boris jumps.
1)Find the vertical displacement , D(t) = H(a)(t) - H(b)(t) as a function of time for the interval 0 < t < t(r) , where H(a)(t) is the height of the raised hands of Arabella, while H(b)(t) is the height of the raised hands of Boris.
Express the vertical displacement in terms of H, g , and t.
Answers
The vertical displacement D(t) between two jumping basketball players can be found using the kinematic equation for vertical motion. By accounting for the later jump time of the second player, we can subtract their height functions to find the displacement as a function of time in terms of initial height H, gravitational acceleration g, and time t.
Explanation:The student's question involves calculating the vertical displacement of two basketball players, Arabella and Boris, during their jumps, with Arabella starting her jump before Boris. To find the vertical displacement D(t) as a function of time, we need to consider the kinematic equation for vertical motion H(t) = V0t - (1/2)gt2, where V0 is the initial vertical velocity, g is the acceleration due to gravity (9.8 m/s2), and t is the time.
Assuming both players have the same V0 and are affected by the same g, the displacement of each player at any time t is given by:
For Arabella: H(a)(t) = V0t - (1/2)gt2For Boris: H(b)(t) = V0(t - tr) - (1/2)g(t - tr)2Given that Boris starts jumping at time tr later than Arabella, his height function H(b) has t - tr. The vertical displacement D(t) between Arabella and Boris from 0 < t < tr can be found by subtracting the height of Boris from the height of Arabella:
D(t) = H(a)(t) - H(b)(t)
Substituting in the expressions for H(a)(t) and H(b)(t) gives us the final expression for D(t) in terms of the known quantities H, g, and t.
describe an example of how non visible radiation can be used
Answers
Non-visible radiation is used in medical imaging, such as X-rays and ultrasound, in sterilization and disinfection with UV light, and in commercial applications like detecting metal flaws and preserving food.
Example of Non-Visible Radiation Used in Medical Imaging:
Medical imaging is a major application of non-visible radiation that does not rely on radioisotopes. An example of this is the use of X-ray imaging to view the internal structure of the body, which utilizes X-rays, a form of electromagnetic radiation outside the visible spectrum, to create images of bones and organs. Ultrasound, another non-visible form of radiation, uses high-frequency sound waves to produce images of soft tissues, such as inside a pregnant woman's womb to monitor the developing fetus.
Non-Visible Radiation in Sterilization and Disinfection:
Another use of non-visible radiation is in the field of sterilization and disinfection. Ultraviolet (UV) light is effective at killing microorganisms by causing damage to their DNA. This type of nonionizing radiation is less energetic than ionizing radiation and can be used to sterilize surgical instruments and disinfect water without penetrating the material of the packaging or damaging the cells of human tissue.
Non-Visible Radiation for Pest Control and Food Preservation:
Non-visible radiation is also used commercially, such as using gamma rays from cobalt-60 to detect flaws in metals and to sterilize male flies for pest control. In food preservation, non-visible radiation is applied to kill microorganisms that can spoil food, thus extending its shelf life and reducing the risk of foodborne illnesses without the use of chemical preservatives.
The electromagnet in a galavanometer.
a. increases the voltage in a circuit.
b. moves a pointer along a numbered scale in response to a current.
c. induces an electric current.
d. increases the current in a circuit.
Answers
along a numbered scale in response to a current.
Amy counts the wave crests traveling down a stretched string. Five wave crests pass Amy in two seconds. What is the frequency of the wave?
A. 5.0 Hz
B. 2.5 Hz
C. 10 Hz
D. 2.0 Hz
Answers
so it is B. 2.5 Hz
When motion IS changing directions, acceleration is the rate at which ________changes, but when motion is NOT changing direction, acceleration may be expressed as the rate at which ________ changes.
A. speed, time
B. velocity, speed
C. elapsed time, average speed
...?
Answers
When motion IS changing directions, acceleration is the rate at which velocity changes, but when motion is NOT changing direction, acceleration may be expressed as the rate at which speed changes.
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Acceleration is the rate at which velocity changes when direction is involved, and the rate at which speed changes when there is no directional change.
When motion is changing directions, acceleration is the rate at which velocity changes, but when motion is not changing direction, acceleration may be expressed as the rate at which speed changes.
Acceleration is defined as the time rate of change of velocity, which includes both the magnitude and direction of the velocity vector. Therefore, when an object changes its direction, even if maintaining a constant speed, it is still undergoing acceleration because its velocity vector is changing. However, when the direction is constant and only the speed changes, acceleration refers to the rate of this change in speed.
Use your data (attachment) from Part 3 and Newton’s laws to explain why the force meter measures a force if the cart is moving at a constant velocity. You should cover the following points. State Newton’s first law.
• Identify the forces acting on the cart.
• Describe the relationships between applied force and mass and between applied force and weight as linear (from data or mathematical derivation by applying Newton’s first law).
• Explain why the data are linear in terms of Newton’s first law.
• Graph F versus mass + cart.
Answers
This is in accordance to Newton's first law which states that an object at rest will remain at rest and an object in motion will remain in motion unless an external force acts on it. The force must be a resultant force.
Therefore, the force needed increases with the total weight of the cart as well as with the added mass in a linear manner.
Why is pluto not a planet?
Answers
Hope this helps!
Pluto is not a planet because it's a dwarf planet it's to small to be a planet.
Hopefully this helped =)!
A gas is confined to a cylinder under constant atmospheric pressure, as illustrated in the following figure. When the gas undergoes a particular chemical reaction, it absorbs 829J of heat from its surroundings and has 0.69kJ of P−V work done on it by its surroundings. What is the value of ΔH for this process?
Answers
The value of ΔH for this process is 1.519 kJ.
Explanation:To calculate the value of ΔH for a process, we need to consider the heat absorbed or released and the work done on or by the system.
In this case, the gas absorbs 829J of heat from its surroundings and has 0.69kJ of P−V work done on it by its surroundings.
The ΔH for this process can be calculated as ΔH = q + w, where q represents the heat absorbed or released and w represents the work done on or by the system. Therefore, ΔH = 0.829 kJ + 0.69 kJ = 1.519 kJ.
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The blank is the the distance between two crests or two troughs on a transverse wave. It is also the distance between compressions or the distance between rarefactions on a longitudinal wave.
Answers
It is the distance between compressions or the distance between rarefactions on a longitudinal wave too!
So, your final answer is "Wavelength".
Hope this helps!!
Answer : Wavelength.
Explanation :
A disturbance created in a medium produces wave.
In transverse wave, the particles of the medium moves in the direction perpendicular to the direction of propagation of wave.
The uppermost portion of the wave is called the crest and the lower most portion is called the trough.
In longitudinal wave, the particles of medium moves in the same direction of wave i.e. in the direction parallel to the wave.
The particles of medium in longitudinal wave forms compressions and rarefactions. In compression the density of particles in more in a particular space while in rarefaction it is less.
Hence, the wavelength is the the distance between two crests or two troughs on a transverse wave.
It is also the distance between compressions or the distance between rarefactions on a longitudinal wave.
When a car screeches to a sudden stop to avoid hitting a dog, it slows down from 9.00 m/s to 0.00 m/s in 1.50 s. Find the average acceleration of the car.
Answers
[tex]a=\frac{\Delta v}{t}[/tex]
where [tex]a=[/tex] acceleration, [tex]\Delta v=[/tex] change in velocity, and [tex]t=[/tex] time
So we get
[tex]a=\frac{-9.00\ m/s}{1.50\ s}[/tex]
[tex]\rightarrow a=-6.00\ m/s^{2}[/tex]
Answer:
a = - 6 m/s/s
here negative sign shows that velocity is decreasing with time
Explanation:
As we know that average acceleration is given by
[tex]a_{avg} = \frac{v_f - v_i}{\Delta t}[/tex]
here we will have
[tex]v_f[/tex] = final speed = 0 m/s
[tex]v_i[/tex] = initial speed = 9 m/s
[tex]\Delta t[/tex] = time interval = 1.50 s
now from above equation we will have
[tex]a = \frac{0 - 9}{1.5}[/tex]
[tex]a = - 6 m/s^2[/tex]
so average acceleration will be -6 m/s/s