Jake and brenda drove at a speed of 30 miles for one hour then they turned around and drove 45 miles per hour until they were back where they started what is the true or what is true about their average speed and average velocity
Answer:
Average speed is greater than average velocity. Average velocity is zero.
Explanation:
Average speed is calculated by:
[tex]\text{Average speed} =\frac{\text {Total Distance}}{\text{Total time taken}}[/tex]
Distance is the length of the total path traveled.
Average velocity is given by:
[tex]\text{Average velocity} =\frac{\text {Total Displacement}}{\text{Total time taken}}[/tex]
Displacement = final position - initial position.
Since, final position =initial position, Displacement = 0, therefore, average velocity = 0
It can be concluded that average velocity is zero and average speed is greater than average velocity.
a roller coaster slows as it travels up a hill
a) speed
b) velocity
c) acceleration
As the roller coaster ascends the hill, it experiences a decrease in speed which affects its velocity, leading to what we describe as negative acceleration or deceleration.
Explanation:When a roller coaster is traveling up a hill, it begins to slow down due to the force of gravity opposing its motion. This is a scenario of negative acceleration or deceleration.
Speed refers to how fast an object is moving without concerning the direction. In this case, the speed of the roller coaster decreases as it climbs the hill.
Velocity includes both the speed and direction of an object's motion. Here, the velocity also decreases as the speed decreases and the direction is upwards.
Acceleration refers to the rate of change of velocity. When the roller coaster slows down while moving up, it is undergoing negative acceleration or deceleration.
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The height of the washington monument is measured to be 170 m on a day when the temperature is 30.0°c. what will its height be in meters on a day when the temperature falls to −16.0°c? although the monument is made of limestone, assume that its thermal coefficient of expansion is the same as marble's.
An exothermic reaction ___ energy.
A) releases
B) absorbs
C) creates
D) decreases
what is the atomic number z of 73li?
[tex] ^7 _3 {Li} [/tex] means that the element is Lithium (Li), 7 corresponds to its mass number (sum of protons and neutrons), 3 corresponds to its atomic number (number of protons in the nucleus).
The problem asks for the atomic number (Z) of this isotope: based on what we said previously, the answer is 3.
A 500g sample of Potassium-40 is left to decay radioactively. After 3.9 x 109 years, about how many grams of Potassium-40 are expected to remain? [The half-life of Potassium-40 is 1.3 x 109 years.]
What kind of movement does the heat within the core and mantle directly generate?
The molar enthalpy of fusion for water is 6.008 kj/mol. what quantity of energy is released when 253g of liquid water freezes? (molar mass of water is 18.02 g/mol)
When a front wheel drops off the roadway you should?
When a front wheel drops off the roadway, stay calm, maintain a firm grip on the steering wheel, slow down gradually, and carefully steer back onto the road while checking for traffic.
When a front wheel drops off the roadway while you are driving, there are several steps you should follow to safely regain control:
Stay calm: Avoid any sudden movements or panicking, which can worsen the situation.
Hold the steering wheel: Keep a firm grip on the steering wheel to maintain control of the vehicle.
Decelerate gradually: Slowly lift your foot off the accelerator to decrease speed, but do not brake suddenly as this can cause further loss of control.
Slowly steer back: Gradually steer the vehicle back onto the roadway once you have slowed down sufficiently.
Check for traffic: Always ensure it is safe to merge back onto the road by checking for other vehicles.
By following these steps, you can safely recover from your front wheel dropping off the roadway and minimize the risk of an accident.
A violin string that is 50.0 cm long has a fundamental frequency of 440 Hz. What is the
speed of the waves on this string?
Answer:
30800 m/s
Explanation:
correct answer
When an object moves at a very high speed relative to an observer, its measured length in the direction of motion is contracted. t true?
Sound from source a has twice the frequency of sound from source
b. compare the wavelengths of sound from the two sources.
in order to produce a current in a cell, the terminals must what?
a. have a potential difference
b. be exposed to light
c. be in a liquid
d. be at two different temperatures
Temperatures of four liquid substances are shown in the chart.
Which statement is best supported by the data in the chart?
A) Substance X will transfer thermal energy to substance Y mainly through radiation if they are mixed.
B) Substance Y will transfer thermal energy to substance Z through conduction if they are mixed.
C) Substance X will transfer thermal energy to substance W through radiation if they are placed near each other.
D) Substance W will transfer thermal energy to substance X through conduction if they are mixed.
For those of you taking the course on Edge, the right answer is D.
Answer: D) Substance W will transfer thermal energy to substance X through conduction if they are mixed.
Explanation: Thermal energy is the energy possessed by an object by virtue of its temperature. It is transferred from a hotter object to a colder object till both the bodies attain the same temperature.
Radiation occurs when thermal energy is transferred by electromagnetic waves. Conduction occurs when thermal energy is transferred when two objects are in direct contact.
Thus Substance W at a temperature of [tex]40^0C[/tex] will transfer thermal energy to substance X at a temperature of [tex]37^0C[/tex] through conduction if they are mixed as they are in direct contact.
which is a necessary part input for all heat engines?
A) Steam to act as a working substance
B) An energy source, such as fuel or electrticity
C) A device to generate electrticity
D) Luiqid water to act as a working substance
Which term does not identify a vector quantity?
If we start with 1.000 g of cobalt-60, 0.675 g will remain after 3.00 yr. this means that the of is _____
Which is a characteristic that makes electromagnetic waves and water waves different
The graph indicates what about the relationship between wavelength and frequency
Wavelength and frequency of awave are in inverse proportion. Therefore, the graph showing as the frequency increases, wavelength decreases.
What is wavelength?Wavelength of an electromagnetic wave is the distance between its two consecutive troughs or two consecutive crusts. Wavelength of a wave indicates how much distance it can cover.
Frequency of an electromagnetic wave is the number of cycles or waves get in one second. Thus its unit is s-1. Frequency of first last some radiations in the spectrum that are UV, gamma, x-ray etc are higher and they have shorter wavelength.
High frequency waves are more energetic whereas longer wavelength is associated with less energy. The relation between frequency v and wavelength lambda is written as follows:
[tex]v = \frac{c}{\lambda}[/tex]
Where c is the speed of light.
As per this relation frequency is inversely proportional to the wavelength. Hence they are in inverse relation.
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Each line on a speed-lock cutting head tool arm knob moves the cutting tip ______ in or out.
It is to be noted that each line on a Speed-Lock cutting head tool arm knob moves the cutting tip .0025” in or out.
The question pertains to the movement of the cutting tip on a Speed-Lock cutting head tool arm knob. A Speed-Lock cutting head tool arm knob likely refers to a component in a machining or cutting tool system, facilitating adjustments.
The statement "Each line on a Speed-Lock cutting head tool arm knob moves the cutting tip .0025” in or out" suggests that each line corresponds to a movement of 0.0025 inches for the cutting tip.
Therefore, the correct answer is option B, indicating that each line on the knob moves the cutting tip by 0.0025 inches.
Full Question:
Although part of your question is missing, you might be referring to this full question:
Q6. Each line on a Speed-Lock cutting head tool arm knob moves the cutting tip ______ in or out.
A. .001”
B. .0025”
C. .010”
D. .020”
A 100 kg bag of sand has a weight on 100 N. When dropped its acceleration is what?
Answer:
Gravity.Explanation:
If you are holding the bag of sand, the only acceleration in the system is gravity, because is a vertical movement. So, [tex]a = 9.81 \frac{m}{s^{2} }[/tex]
We are assuming that is vertical movement because is say ''dropped'', which is a term used in Free-fall models, where acceleration is constant.
A spring with a spring constant of 1.8 × 102 n/m is attached to a 1.5 kg mass and then set in motion.
a.what is the period of the mass-spring system?
b.what is the frequency of the vibration
Part A: The time period of the mass-spring system is 0.573 seconds.
Part B: The frequency of the vibration of the mass-spring system is 1.75 Hz.
Time Period and FrequencyGiven that the mass of the spring is 1.5 kg and the spring constant is 1.8 × 10^2 n/m.
Part AThe period of the mass-spring system is given by the formula.
[tex]T=2\pi\sqrt{\dfrac {m}{k}}[/tex]
Where m is mass and k is spring constant.
Substituting the values in the above equation, we get the time period.
[tex]T = 2 \times 3.14 \times \sqrt{\dfrac {1.5}{ 1.8 \times 10^2}}[/tex]
[tex]T = 0.573 \;\rm s[/tex]
Hence the time period of the mass-spring system is 0.573 seconds.
Part BThe frequency of the vibration is given below.
[tex]f = \dfrac {1}{T}[/tex]
[tex]f = \dfrac {1}{0.573}[/tex]
[tex]f = 1.75 \;\rm Hz[/tex]
Hence the frequency of the vibration of the mass-spring system is 1.75 Hz.
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A forklift lifts 5 boxes from the ground to a height of 2 meters (m). The boxes push down with a force of 1000 newtons (N). How much work was done by the forklift to lift the boxes?
Answer:
2000 j
Explanation:
its the right answer
The largest tides occur at _____.
1. new moon
2. full moon
3. first quarter
4. last quarter
5. solar eclipse
6. lunar eclipse
This is a multiple answer question.
The largest tides occur at full moon, solar eclipse, and lunar eclipse. Thus, the correct option is B, E, and F.
What are solar and lunar eclipses?Eclipses are of two types: Solar and Lunar eclipse. A solar eclipse occurs when the moon enters between the sun and the earth, which its shadow on the earth's surface.
A lunar eclipse occurs when the earth is moved between the sun and the moon and the Earth leaves its shadow on the moon. The tides form in seas because of the gravitational force of the moon.
The gravity of the moon makes the tides or waves in the seas or oceans. The full moon has more gravitation force and hence, larger tides are formed. The largest tides are also formed by solar and lunar eclipses.
When the sun is aligned with the moon during the eclipse, the sun is also pulling in the same direction resulting in the largest tides. The gravitational pull of the sun and moon increases the tides in ocean surfaces on Earth.
Thus, the largest tides occur at Full moon, solar and lunar eclipse. The correct options are B, E, and F.
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What is the wavelength (angstroms) of a photon that has an energy of 4.38 x 10-18 j?
Answer: The relationship between energy and frequency of a photon is given by E = h*f.
E is the energy, h is planck constant and f is the frequency and f= c/λ.
But i want wavelength, so i write this equation as E= h*c/λ.
now
c=3.8[tex]*10^{8}[/tex]
E =4.38*[tex]10^{-18} [/tex] [tex]\frac{m^{2}*kg }{s^{2} }[/tex]
where i replaced joules for [tex]\frac{m^{2}*kg }{s^{2} }[/tex]
h = 6.62607004 *[tex]10^{-34}[/tex][tex]\frac{m^{2}*kg }{s }[/tex]
then λ = h*c/E = [tex]\frac{6.62607004 *10^{-34}*3.8*10^{8}m/s}{4.38*10^{-18} \frac{m^{2}*kg }{s^{2} }}[/tex] = 5.7*[tex]10^{-8}[/tex] m
But you want the solution in angstroms, so 1 meter is [tex]10^{10}[/tex] angstroms
so λ = 5.7*[tex]10^{2}[/tex] = 570 angstrom
Why is newton's first law of motion sometimes called the lae of inertia?
Final answer:
Newton's first law of motion, also known as the law of inertia, states that an object at rest remains at rest and an object in motion remains in motion unless acted upon by an external force.
Explanation:
Newton's first law of motion states that a body at rest remains at rest or, if in motion, remains in motion at a constant velocity unless acted on by a net external force. This law is also known as the law of inertia. Inertia is the tendency of an object at rest to remain at rest or, if moving, to remain in motion at constant velocity. Inertia is related to an object's mass.
How does the doppler effect affect the velocity from a sourse that is approaching you?
Help please!!!!!!!!!!!!!!!!!!!!
Which parameter of glass is measured with bromoform and bromobenzene mixtures in a column?
Answer: Density
Explanation:
Density is the parameter which is used for comparision of two doubted to be similar pieces of the glasses in the columns where a specific volume of liquids bromoform and bromobenzene are used. The two glasswares (graduated cylinders) are used in this process along with the liquids. The level at which the glass pieces in the column settles that represent their density. If two pieces of glass are from same source then they will settle at the same level in the column. This method is known as density gradient method.
Inner planets that are composed mainly of rock and metal are called