What is the weight on earth of a girl with a mass of 17 kg?
A car is traveling at a constant speed of 23 m/s on a highway. at the instant this car passes an entrance ramp, a second car enters the highway from the ramp. the second car starts from rest and has a constant acceleration. what acceleration must it maintain, so that the two cars meet for the first time at the next exit, which is 3.0 km away?
Final answer:
To catch up with the first car at the exit 3.0 km away, the second car, starting from rest, must maintain an acceleration of approximately 0.3524 m/s².
Explanation:
To solve for the acceleration that the second car must maintain to meet the first car at the next exit 3.0 km away, we can use the equations of motion for uniformly accelerated motion.
Since the first car is traveling at a constant speed of 23 m/s and the distance to the next exit is 3.0 km (which is 3000 meters), we can determine the time it will take for the first car to reach the exit. The time (t) can be found using the equation:
Distance = Speed × Time
So, for the first car, Time = Distance/Speed = 3000 m / 23 m/s = 130.43 seconds.
The second car starts from rest (initial velocity = 0) and must cover the same 3000 meters in the same time, but under constant acceleration. We can use the equation for displacement under constant acceleration:
Displacement = Initial Velocity × Time + (1/2) × Acceleration × Time²
Since the initial velocity (u) is 0 m/s for the second car, the equation simplifies to:
3000 m = (1/2) × Acceleration (a) × (130.43 s)²
Now we can solve for the acceleration (a):
Acceleration = (2 × 3000 m) / (130.43 s)²
Acceleration = 6000 m / 17022.1849 s²
Acceleration = 0.3524 m/s²
Therefore, the second car must maintain an acceleration of approximately 0.3524 m/s² to meet the first car at the exit.
The Sears Tower in Chicago is 443 m tall. Joe wants to set the world's stair climbing record and runs all the way to the roof of the tower. If Joe's average speed is 0.60 m/s, how long will it take Joe to climb from street level to the roof of the Sears Tower?
*This is about average velocity and displacement.
Joe will take approximately 738.33 seconds to climb from street level to the roof of the Sears Tower.
Explanation:To calculate the time it will take Joe to climb from street level to the roof of the Sears Tower, we can use the formula:
Time = Distance/Speed
Joe is climbing a distance of 443 m at an average speed of 0.60 m/s, so we can substitute these values into the formula:
Time = 443 m / 0.60 m/s = 738.33 s
Therefore, it will take Joe approximately 738.33 seconds to climb from street level to the roof of the Sears Tower.
Light and radio waves travel through a vacuum in a straight line at a speed of very nearly 3.00 ´ 108 m/s. How far is light year (the distance light travels in a year)?
Final answer:
A light-year, which is the distance light travels in a year at a speed of 3.00 x 10^8 m/s, is approximately 9.46 x 10^15 meters or about 10 trillion kilometers. This measure is essential in astronomy for gauging the distances between celestial bodies.
Explanation:
How Far Is a Light-Year?
A light year is the distance that light, traveling at a speed of 3.00 × 108 m/s in a vacuum, covers in one year. To find the distance light travels in a year, you multiply its speed by the number of seconds in a year (31,536,000 seconds).
So, the calculation would be 3.00 × 108 m/s × 31,536,000 s/year = 9.46 × 1015 meters/year. Thus, a light-year is approximately 9.46 × 1015 meters or about 10 trillion kilometers.
This distance is used in astronomy to measure the vast distances between celestial bodies in the universe. Since light travels at this constant speed in a vacuum, it enables scientists to estimate how far away stars and galaxies are based on how long their light takes to reach us.
Why does a spoon appear to be bent when it’s in a glass of water?
*PHYSICS HELP*
Without using your spring scale, estimate the order of magnitude of the mass of your calculator in grams from what you judge to be its size, using the fact that the density of water is 1 g/cm3. Assume that the density of water is about the same as the density of your calculator.
1 g
102 g
104 g
106 g
You are building a canoe, and you want to make it out of metal. which property would be most important to consider in choosing which metal to use?
When you double your speed, it takes about _____ times as much distance to stop?
Temperature cannot be considered a field since there are occasions where it is not possible to measure it with a thermometer. True or False?
A car is traveling with constant velocity. this means that _______.
A car is traveling with constant velocity. this means that its position changes with time at constant rate at same direction.
What is velocity?The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.
Velocity informs us about the rate of change of your position, or how quickly your position changes per unit time. Velocity is described in physics as displacement divided by time, where displacement is the difference between your final and initial positions. Furthermore, an object is considered to be moving with constant velocity if it travels the same distance every second. This means that both the amount and direction of the velocity (or speed) stay constant.
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What two instruments in a car can be used to measure the car's average speed?
Answer:
Two essential measurements to calculating average speed are distance and time.
What determines the direction that molecules move during diffusion?
Is work done when you lift a brick?
A.No, the force applied is parallel to the direction of motion.
B.Yes, the force applied is parallel to the direction of motion.
C.No, the force applied is perpendicular to the direction of motion.
D.Yes, the force applied is perpendicular to the direction of motion.
it is B.
Yes, the force applied is parallel to the direction of motion
Answer:
The answer is: "Yes, the force applied is parallel to the direction of motion" Hope this helps :)
Explanation:
a boat is headed with a velocity of 18 meters/second toward the west with respect to the water in a river. if the river is flowing with a velocity of 2.5 meters/second in the same direction as the boat. what would be the magnitude of the boat’s velocity?
Answer: Hi!
You know that the boat has a velocity of 18m/s with respect to the water, and the water has a velocity of 2.5m/s.
Both velocities are in the same direction.
Now, if you are standing in the shore, you have a velocity of 0m/h, then you will see the boat moving with his velocity with respect to the water plus the velocity of the water:
this is V = 18 m/s + 2.5m/s = 20.5m/s
Where the addition is direct because both vectors are in the same direction.
PLZ HELP NEED IT NOW which of the following descriptions could apply to an accelerating car. I. A car rounding a curve. II. A car speeding up to get on a freeway III. A car slowing to get off freeway IV a car maintaining a constant speed. A. II B. II and III c. I II III d. All of the above. Explain why
Answer:
C is the answer
If 500 thousand btus of energy are available to raise the temperature of a water boiler from 20°f to 100°f, how many gallons of water can be added to the boiler?
If 500 thousand BTUs of energy are available to raise the temperature of a water boiler from 20°F to 100°F, then the amount of water that can be added to the boiler is 750 gallons.
Explanation:The subject of this question is physics, specifically the application of thermodynamics in heating water. Given that 1 BTU is the amount of energy needed to heat one pound of water by one degree Fahrenheit, first we need to convert the weight of water from gallons to pounds (since 1 gallon of water weighs about 8.34 pounds). Then, if we are to increase the temperature of the water from 20°F to 100°F, that's a 80°F difference. Hence, the energy required to heat one pound of water from 20°F to 100°F is 80 BTU.
So, if there are 500 thousand BTUs available, the amount of water (in pounds) that can be heated will be 500,000 BTUs divided by 80 BTU per pound, equating to 6250 pounds. Converting this weight back to gallons (since 1 pound of water is approximately 0.12 gallons), the amount of water that can be added to the boiler is 750 gallons.
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Using 500,000 BTUs of energy, you can raise the temperature of approximately 781.25 gallons of water from 20°F to 100°F, given the specific heat capacity of water and its density. This calculation is based on the energy required to heat each pound of water and converting that to gallons.
To determine how many gallons of water can be heated from 20°F to 100°F using 500,000 BTUs of energy, we need to use the specific heat capacity of water. The specific heat capacity of water is 1 BTU per pound per degree Fahrenheit.
First, calculate the total temperature change:
ΔT = 100°F - 20°F = 80°F
Next, we use the formula:
Energy = mass * specific heat capacity * ΔT
Rearrange to solve for mass (in pounds):
mass = Energy / (specific heat capacity * ΔT)
Insert the known values:
mass = 500,000 BTU / (1 BTU/lb/°F * 80°F) = 6,250 pounds
Since the density of water is approximately 8 pounds per gallon, convert the mass of water to gallons:
gallons = mass / density = 6,250 pounds / 8 pounds/gallon = 781.25 gallons
So, you can add approximately 781.25 gallons of water to the boiler.
The law of motion that states that an object will maintain its straight-line motion until acted upon by an unbalanced force is __________ A. F = m*a. B. Newton's second law. C. Newton's first law. D. Newton's third law
There is a simple pattern for determining if a binary number is odd. what is it and why does this pattern occur
There is a simple pattern for determining if a binary number is odd. This is when the number ends in 1. This pattern occured because they are defined by an odd word.
Further explanationThe binary number is a number that expressed in the base-2 numeral system or binary numeral system, that uses only two symbols, typically "0" and "1".
If the number ends in 1, it will be odd, whereas if the number ends in 0, it's even. Because the first digit can only be 0 or 1, the rest of the digits are multiplied by two. To convert a binary number to base 2k, split it into groups of k digits by adding leading 0s if necessary, then convert each group to base 2k.
Example:
1001 represents an odd number (9)1000 represents an even number (8)1101 represents an odd number (13)10010 represents an even number (18).This pattern odd occured because they are defined by an odd word.They are numbers, that are by definition is too many things that they become odd, and also because they look odd again even when split into two
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Subject: physics
Chapter: Computer Science
Keywords: binary number, pattern, odd binary number, even binary number, Computer Science
Carl measures the temperature of the water at different depths of the lake to see if there is a relationship.
Independent Variable:
Dependent Variable:
In Carl's experiment, the independent variable is the depth of the lake, which is being manipulated. The dependent variable is the temperature of the water, which may change based on the depth of measurement.
Explanation:In this lake temperature measurement experiment, the independent variable is the depth of the lake. This is because Carl is manipulating or changing the depth where he is taking water temperature measurements. The dependent variable, on the other hand, is the temperature of the water. The temperature is dependent because its value can possibly change based on the depth of the lake where the temperature measurement is taken.
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An airplane flies 12 m/s due north with a velocity of 35.11 m/s. how far east does it fly?
The push of air on earth is called
What is the energy (in joules) of an ultraviolet photon with wavelength 110 nm?
For light or ultraviolet, the formula for energy can be calculated using Planck’s equation. That is:
E = h c / ʎ
where,
h is the Planck’s constant = 6.626 * 10^-34 m^2 kg / s
c is the speed of light = 3 * 10^8 m/s
ʎ is the wavelength of light = 110 nm = 110 x 10^-9 m
So calculating for energy E:
E = (6.626 * 10^-34 m^2 kg / s) * (3 * 10^8 m/s) / (110 x 10^-9 m)
E = 1.807 x 10^-18 J
Which would hold more water- a teaspoon (tsp) or a milliliter?
Answer:
A teaspoon
Explanation:
As we know that the capacity of hold something by a standard teaspoon is related with milliliters as,
1 teaspoon is equivalent to 4.92892 milliliters
From this it can be see that the 1 teaspoon is equivalent to approximately 5 milliliters.
Therefore, the water hold by 1 teaspoon is more than the water hold by a milliliter.
Hi! Can you help me? :) A satellite's speed is 10,000 m/s. After 1 min, it is 5,000 m/s. What is the satellite's acceleration? Thanks!!
Answer:
Acceleration, [tex]a=-83.33\ m/s^2[/tex]
Explanation:
It is given that,
Initial speed of the satellite, u = 10000 m/s
Final speed of the satellite, v = 5000 m/s
Time taken, t = 1 min = 60 seconds
Acceleration of the satellite is given by :
[tex]a=\dfrac{v-u}{t}[/tex]
[tex]a=\dfrac{5000-10000}{60}[/tex]
[tex]a=-83.33\ m/s^2[/tex]
So, the acceleration of the pumpkin is [tex]-83.33\ m/s^2[/tex]. Hence, this is the required solution.
An automobile with a mass of 1232 kg accelerates at a rate of 2 m/s² in the forward direction. What is the net force acting on the automobile? N
What’s the difference between fiber optic cable, twisted pair cable and coaxial cable?
Coaxial cables offer a potential data transfer rate of 80 times quicker than twisted pair connections, which have a maximum of 10 Mbps. High-speed data transport occurs using optical fiber lines. About 69% of the speed of light is used to describe the transfer speed.
What is a Cable?An assemblage of one or more wires running parallel to one another or bundled together that is used to transport electric current is known as an electrical cable.
A cable assembly, which is not always appropriate for connecting two devices but can be a partial product, can be made up of one or more electrical cables and the necessary connectors. A cable tree or cable harness are other examples of cable assemblies that can be utilized to link numerous terminals.
One or more optical fibers are used to carry data using fiber optic cables, also known as optical fiber cables, a type of Ethernet cable. As light pulses pass through small glass tubes, fiber optic cable transfers data. Twisted pair cable's transmission capacity is 26,000 times lower than optical fiber cable's transmission capacity.
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Final answer:
Fiber optic cables, twisted pair cables, and coaxial cables are different types of cables used in telecommunications. Fiber optic cables use light signals for data transmission, while twisted pair and coaxial cables use electrical signals. Each cable has its own advantages and is used for different purposes.
Explanation:
Fiber optic cables, twisted pair cables, and coaxial cables are all types of cables used for transmitting signals in telecommunications. Here are the differences:
Fiber optic cable: Uses thin strands of glass or plastic to transmit data using light signals. It offers high bandwidth, low loss, and reduced crosstalk. It is commonly used for long-distance communication due to its superior performance.Twisted pair cable: Consists of twisted pairs of copper wires. It is commonly used for Ethernet networks and telephone lines. It is cost-effective and reliable for shorter distances.Coaxial cable: Has a central conductor surrounded by an insulating layer, a shield, and an outer layer. It is used for cable TV, Internet, and high-frequency transmissions. It offers high bandwidth, but its performance may degrade over long distances.Overall, the choice of cable depends on the specific application and requirements.
Scientists are concerned about the release of methane from the arctic because _______. a. as a greenhouse gas methane is 20 times more potent than carbon dioxide b. the mass of the arctic’s methane is comparable to that of the Earth’s coal beds c. global warming appears to be accelerating its release d. all of the above
Answer: d. all of the above
Methane is a powerful greenhouse gas that contributes to the phenomena of global warming. One mole of methane is 10 times more powerful than one mole of CO₂. It is a dominant greenhouse gas. In Artic region the methane is released from the sea bed and the permafrost soil. The methane is released as natural gas reserve from these sources as a outcome of the process of methanogeneisis. It involves the partial or uncomplete degradation of dead remains of animals and plants and rapid heating and thawing conditions.
The gas releases in the atmosphere because of all the four options.
The packets of energy that light travels in are called
A child dangles a 1.50-kilogram stuffed toy 0.500 meters from the ground. What is the potential energy of the toy?
Answers are:
0.188 J
0.750 J
7.35 J
14.7 J
Answer: 7.35 Joules
Explanation:
i got it right in my exam
What is the energy of a rock that weighs 125 n that is sitting on top of a hill 301 m high?
The gravitational potential energy is:
PE = (125 n) * (9.81 m/s^2) * (301 m)
PE = 37,253 J
If the rock were to fall from the top of the hill, it would gain kinetic energy as it falls and its potential energy would be converted to kinetic energy. The total energy of the rock would remain constant, as energy is conserved.
What is gravitational potential energy?
The energy of an object that is sitting on top of a hill is called gravitational potential energy. Gravitational potential energy is the energy an object possesses due to its position in a gravitational field. It is defined as the work required to move an object from a reference position to its current position against the force of gravity.
The formula for gravitational potential energy is:
PE = m * g * h
where PE is the gravitational potential energy, m is the mass of the object, g is the acceleration due to gravity (9.81 m/s^2 on Earth), and h is the height of the object above the reference position. The unit of gravitational potential energy is typically the joule (J).
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