Answer:
2.84 seconds
Explanation:
t = ?
distance = 125
Velocity origianal = 60 m/hr = 88 ft/s
AVERAGE velocity = 88/2 = 44 ft/s
44 t = 125
t = 125/44 = 2.84 s
A chemical reaction is the only way to separate a(n)
Answer:
pure substance
Explanation:
yw
Two 1-kg objects, C and D, increase in temperature by the same amount, but the
thermal energy transfer of object C is greater than the thermal energy transfer of
object D. If object C has a specific heat of 235 J/kg-K, which material might object
D be made of?
(A) aluminum
(B) brass
(C) iron
(D) lead
The object D is made up of material Lead. The correct option is D.
What is specific heat?The specific heat is the amount of heat required to change the temperature by 1°C. It is denoted by C.
Two 1-kg objects, C and D, increase in temperature by the same amount, but the thermal energy transfer of object C is greater than the thermal energy transfer of object D. The object C has a specific heat of 235 J/kg-K.
Q = m C ΔT
Qc > Qd
The energy transfer is proportional to specific heat.
Specific heat of D must be less. The possible material with specific heat less than the given value is for Lead material.
Thus, the correct option is D.
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Emmett is lifting a box vertically. Which forces are necessary for calculating the total force?
Fp, Ff, and Fg
Fp and FN
Fp, FN, and Ff
Fp and Fg
The forces necessary for calculating the total force are Fp and Fg. The correct option is d.
What is gravity?The force of attraction felt by a person at the center of a planet or Earth is called as the gravity.
The gravitational force, Fg is the attractive force exerted by the Earth on the object that is equal to the mass of the object times the gravitational acceleration.
Emmett is lifting a box vertically. There are only vertical forces acting on the box.
The vertical force must counteract the weight of the object, is the upward force applied on the object.
Thus, the forces necessary for calculating the total force is Fp - Fg.
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Sam runs 9 kilometers in 2.5 hours. what is his speed?
Considering the definition of speed, the speed of Sam is 3.6 [tex]\frac{km}{h}[/tex].
Definition of speedSpeed is a quantity that expresses the relationship between the space traveled by an object. That is, the speed is associated with the change of position of an object in space within a certain amount of time.
The speed can be calculated using the expression:
[tex]speed= \frac{displacement}{time}[/tex]
Speed of SamIn this case, you know:
displacement= 9 kmtime= 2.5 hReplacing in the definition of speed:
[tex]speed= \frac{9 km}{2.5 h}[/tex]
Solving:
speed= 3.6 [tex]\frac{km}{h}[/tex]
Finally, the speed of Sam is 3.6 [tex]\frac{km}{h}[/tex].
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as the moon phase approaches full we say the Moon is doing what
As the moon phase approaches full we say the Moon has now completed one half of the lunar month.
What is Lunar month?This is defined as the time it takes the Moon to pass through all of the phases.
When the moon approaches full then itn has completed one half of the lunar month which is the time taken to form a new moon.
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During a certain chemical reaction, energy is transferred from the reaction system to its surroundings. Which statement is true in this situation? OA. The particles differ in potential energy instead of kinetic energy. B. The particles in the reaction system have more kinetic energy. C. The particles in the surroundings have more kinetic energy. OD. The kinetic energy of the particles in the system and its surroundings are the same.
The particles in the reaction system have more kinetic energy than the surroundings.
What is exothermic reaction?Exothermic reaction is a type of reaction in which energy is lost to the environment.
Internal energy (E) = kinetic energy (K.E) + potential energy (P.E)
Change in internal energy (ΔE) = K.E (particles) - K.E (surroundings)
Since energy is lost to the environment, we can conclude that the particles in the reaction system have more kinetic energy than the surroundings.
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the speed of all electromagnetic waves in emoty space is 3.0x10^8 m/s .calculate the wavelength for radio waves with frequency 100.0 mhz
Taking into account the definition of wavelength, frecuency and propagation speed, the wavelength for radio waves with a frequency of 100 MHz is 3 m.
Definition of wavelength, frecuency and propagation speedFirst of all, wavelength is the minimum distance between two successive points on the wave that are in the same state of vibration. It is expressed in units of length (m).
On the other side, frequency is the number of vibrations that occur in a unit of time. Its unit is s⁻¹ or hertz (Hz).
Finally, the propagation speed is the speed with which the wave propagates in the medium, that is, it is the magnitude that measures the speed at which the wave disturbance propagates along its displacement.
The propagation speed relate the wavelength (λ) and the frequency (f) inversely proportional using the following equation:
v = f×λ
All electromagnetic waves propagate in a vacuum at a constant speed of 3×10⁸ m/s, the speed of light.
Wavelength for radio wavesIn this case, you know:
v= 3×10⁸ m/sf= 100 MHz= 100,000,000 Hz (being 1 MHz = 1,000,000 Hz)λ= ?Replacing in the definition of propagation speed:
3×10⁸ m/s = 100,000,000 Hz× λ
Solving:
λ= 3×10⁸ m/s ÷ 100,000,000 Hz
λ= 3 m
In summary, the wavelength for radio waves with a frequency of 100 MHz is 3 m.
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Individuals should participate in activities __________ to improve cardiovascular fitness.
A.
twice a day
B.
three to five days a week
C.
two to three days a week
D.
seven days a week
HURRY!!
Individuals should participate in activities three to five days a week to improve cardiovascular fitness.
What is cardiovascular fitness?Cardiovascular fitness is a measure of how well ones body can take in oxygen and deliver it to muscles and organs during prolonged periods of exercise.
A person is considered cardiovascular fit if they can exercise for a long period of time without getting unduly tired.
Examples of cardiovascular exercises are;
swimmingcyclinghikingHowever, individuals should participate in activities three to five days a week to improve cardiovascular fitness.
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Type the correct answer in the box.use numerals instead of words. if necessary, use / for the fraction bar. δabc is a right triangle in which ∠b is a right angle, ab = 1, ac = 2, and bc = . cos c × sin a =
From the diagram The value of cos C × sin A = [tex]\frac{3}{4}[/tex]
Determine the numerical value of cos C × sin AFirst step : determine the values of cos C and sin A
cos C = adjacent / hypotenuse
= a / b
= [tex]\sqrt{3} / 2[/tex]
= √3/2
sin A = sin 60⁰
= √3/2
Therefore the numerical value of cos C * sin A = [tex]\frac{3}{4}[/tex]
In conclusion From the diagram The value of cos C × sin A = [tex]\frac{3}{4}[/tex]
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2. Use the pattern of charge distribution to draw the relative size of the atoms in the space below. Please fill out the table!!! thank you
Potassium will have the greatest atomic size because of its number of shells, followed by sodium which 1 valence electron compared to magnesium the same number of shells but 2 valence electrons.
Relative size of the atomsThe relative size of the atoms is determined from the number of shells and valence electron contained in the atom.
Sodium, 11 ----> 2, 8, 1
Magnesium, 12 ----> 2, 8, 2
Potassium, 19, -----> 2, 8, 8, 1,
Potassium will have the greatest atomic size because of its number of shells, followed by sodium which 1 valence electron compared to magnesium the same number of shells but 2 valence electrons.
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Pls answer, i need help :(
Answer: B
Explanation: AN increase in heat out
How does gravity relate to potential energy?
Answer:
the potential energy a massive object has in relation to another massive object due to gravity
Answer:
PE uses the acceleration of gravity in its calculation definition
Explanation:
Potential Energy = mass * acceleration of gravity * height
if water completely boils in 7 minutes, how long does it take to evaporate
Answer: 20 minutes
Explanation: omm its 20 minutes
If you had to choose a theory that best represents your own view of development, would you choose a single theory or would you select components of several different theories? what aspect of your chosen theory (or theories) make it more attractive than others
I would select components of several different theories and the aspect which will be more attractive will be the one which has similarities and accurate.
What is a Theory?This is defined as a proposed explanation for a particular phenomenon or occurrence.
Components of several different theories will bring different dimensions and factors to the occurrence which will help in its thorough analysis.
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Engineers are trying to improve a race car. Their goal is to increase the acceleration of the car using the same engine. Which change shows the best application of Newton’s laws of motion to achieve this goal?
increasing the inertia of the car
decreasing the reaction force
increasing the action force
decreasing the mass of the car Engineers are trying to improve a race car. Their goal is to increase the acceleration of the car using the same engine. Which change shows the best application of Newton’s laws of motion to achieve this goal?
increasing the inertia of the car
decreasing the reaction force
increasing the action force
decreasing the mass of the car
The change which shows the best application of Newton’s laws of motion to achieve this goal is decreasing the mass.
What is Newton's second law of motion?It states that the force F is directly proportional to the acceleration a of the body and its mass.
F =ma
or a = F/m
The mass and acceleration are inversely proportional to each other. If mass is decreased, then the acceleration is increased.
Thus, the mass should be decreased to increase the acceleration.
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Answer: D
Explanation: Just did EDGE
Which SI units are used to describe energy
Answer:
The SI units used to describe energy is Joule (J)
How does the circuit change when the wire is added? a closed circuit occurs and makes all bulbs turn off. an open circuit occurs and makes all bulbs turn off. a short circuit occurs and makes bulbs 3 and 4 turn off but keeps bulbs 1 and 2 lit. a short circuit occurs and makes bulbs 1 and 2 turn off but keeps bulbs 3 and 4 lit.
The circuit change when a wire is added is, an open circuit occurs and makes all bulbs turn off.
What is a closed circuit?A closed circuit is a type of circuit connection in which the wire connection is complete and current flow occurs, turning the light bulbs on in the process.
What is an open circuit?An open circuit is a type of circuit connection in which the wire connection is incomplete and current cannot flow, turning off the light bulbs.
Thus, the circuit change when the wire is added is, an open circuit occurs and makes all bulbs turn off.
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Four students measured the acceleration of gravity. the accepted value for
their location is 9.78 m/s2. which student's measurement has the largest
percent error?
The student 4 measurement has the largest percent error. The discrepancy between the calculated value and the correct value is referred to as an "error" in statistics.
What is the error?An error is a mistaken or erroneous action. In some contexts, an error is interchangeable with a mistake.
The complete question is
'Four students measured the acceleration of gravity. The accepted value for their location is 9.78m/s2. Which student’s measurement has the largest percent error?
A. Student 4: 9.61 m/s2
B. Student 3: 9.88 m/s2
C. Student 2: 9.79 m/s2
D. Student 1: 9.78 m/s2"
The percentage error is found as;
[tex]\rm \% error = \frac{a_A-a_E}{a_E} \times 100[/tex]
The percentage error in the gIven four students is obtained by putting the values in the given problem;
Student 1 ;
[tex]\rm \% error = \frac{9.78-9.78}{9.88}\times 100 \\\\\ \% error = 0 \%[/tex]
Student 2 ;
[tex]\rm \% error = \frac{9.78-9..79}{9.79}\times 100 \\\\\ \% error = - 0.10 \%[/tex]
Student 3 ;
[tex]\rm \% error = \frac{9.78-9.88}{9.88}\times 100 \\\\\ \% error = - 1.01 \%[/tex]
Student 4 ;
[tex]\rm \% error = \frac{9.78-9.61}{9.61}\times 100 \\\\\ \% error =1.77\%[/tex]
Student 4 reports the maximum percentage error.
Hence the student 4 measurement has the largest percent error.
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A cyclist is traveling along a road due east at 12 km/h and wind is blowing from south-west at 5 km/h . find the velocity of the wind relative to the cyclist.
The velocity of the wind relative to the cyclist is determined as -15.3 km i - 3.5 km j.
Velocity of the wind relative the cyclistThe speed of the wind in x - direction and y - direction is calculated as follows;
v(w/c) = - 5 km(cos 45)i - 5km(sin45)j
v(w/c) = [- 3.5 i - 3.5 j ] km
velocity of wind with respect to cyclist = (-12 km i - 3.5 km i) - 3.5 km j
velocity of wind with respect to cyclist = -15.3 km i - 3.5 km j
Thus, the velocity of the wind relative to the cyclist is determined as -15.3 km i - 3.5 km j.
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A plastic rod that has been charged negatively touches a neutral metal sphere. What kind of charged particle was transferred between the rod
Answer:
Negative particles will be transferred to the sphere,
Assuming the sphere is not grounded the sphere will be negatively charged when the plastic rod is withdrawn,
(The sphere can be positively charged by grounding the sphere and bringing the rod close to the sphere and then remove the grounding to the sphere)
Care must be taken in noting if and when the sphere is grounded.
What is the phase of a 20 gram of crystalline when its temperature is 250 degrees clesius
Explanation:
20÷250 =12.5 and do it by using fourmulaes
Ten minutes after you stop exercising, your heart rate should be (2 points)
equal to your Heart Rate Reserve
in your Target Heart Rate Zone
less than 50 beats per minute
less than 100 beats per minute
Ten minutes after you stop exercising, your heart rate should be equal to your heart rate reserve
What is Heart Rate Reserve?
This is defined as the heart rate the body decreases to after an exercise session has been done.
This however varies according to age of individuals and is calculated by finding the difference between the maximum and resting heart rate.]
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A boy throws a toy up in the air with an initial velocity of 7.9 m/s at an angle of 37 degrees . what is the maximum height reached by the toy?
The maximum height reached by the toy at the given velocity and angle of projection is determined as 1.15 m.
Maximum height reached by the toyThe maximum height reached by the toy is calculated as follows;
H = u²sin²θ/2g
where;
u is the initial velocityθ is the angle of projectiong is gravityH = (7.9² x (sin37)²)/(2 x 9.8)
H = 1.15 m
Thus, the maximum height reached by the toy at the given velocity and angle of projection is determined as 1.15 m.
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The diagram shows an incomplete scale drawing to find the resultant of two 10N forces acting at a point in the direction shown
The resultant of the two 10N forces acting at a point in the given direction is the single force which will have the same effect as all the forces acting at that point.
What is the resultant of forces?The resultant of two or more forces is that single force which will have the same effect as all the forces acting at that point in a given direction.
Since forces are vector quantities, the resultant force is obtained by vector addition.
The direction of the forces are also obtained.
Therefore, the resultant of the two 10N forces acting at a point in the given direction is the single force which will have the same effect as all the forces acting at that point.
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It takes 25N or force to drag a box along the floor at a constant speed. If the coefficient of friction is .3, what is the mass of the box?
The mass of the box is 8.5 kg.
What is mass?Mass can be defined as the quantity of matter contained in a body.
To calculate the mass of the box, we use the formula
Formula:
F = mgμ............. Equation 1Where:
F = Forcem = mass of the boxg = acceleration due to gravity μ = coefficient of frictionMake m the subject of the equation
m = F/gμ..................... Equation 2From the question,
Given:
F = 25 Ng = 9.8 m/s²μ = 0.3Substitute these values into equation 2
m = 25/(0.3×9.8)m = 25/2.94m = 8.5 kgHence, the mass of the box is 8.5 kg.
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What is the direction of a current that experiences the magnetic force shown above
east
south
north
west
Answer:
Sorry if I kwon the
answer I telling u
the answer sorry
Question 2 of 34
You are adding two vectors pointing in the same direction. How do you find
the magnitude of the resultant vector?
OA. By subtracting the magnitude of the shorter vector from the
magnitude of the longer vector
B. By adding the magnitudes of the two vectors
O C. By subtracting the magnitudes of the two vectors
D. By subtracting the magnitude of the longer vector from the
magnitude of the shorter vector
You can find the magnitude of the resultant vector : (B). By adding the magnitudes of the two vectors
Meaning of Vectors
A vector can be defined as any quantity which possesses magnitude and also has direction.
A Vector quantity is very useful because This type of quantity gives more details to the student or teacher analyzing it.
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explain the law of conservation of energy in your own words
Answer:
The law of conservation of mass states that the total energy of an isolated system remains constant over time.
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How fast would you (70kg) need to run in order to have the same momentum as a car (750kg) driving at 5 km/hr?
From the calculations and the data provided, the speed is obtained as 15 m/s
What is momentum?The term momentum refers to the product of mass and velocity. Given that we can now proceed with the answer.
Since;
p = mv
m = 750kg
v = 5 km/hr or 1.4 m/s
p = 750kg * 1.4 m/s
p = 1050 kgm/s
If the mass of the body is 70kg, the speed is
v = p/m
v = 1050 kgm/s/70 Kg
= 15 m/s
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How does gravity influence our solar system? Claim Evidence Reasoning
Answer:
Gravity is what holds the planets in orbit around the sun and what keeps the moon in orbit around Earth. The gravitational pull of the moon pulls the seas towards it, causing the ocean tides. Gravity creates stars and planets by pulling together the material from which they are made.
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