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Car whose mass is 4.72 103 lb is traveling at a speed of 46 miles per hour What is the kinetic energy of the car in joules?
Wiki User
∙ 13y ago
Check for definition: kinetic-energy
4.72103 lb = 2.14334762 kg
46 miles = 46*1609=74014 meters, and, 1 hour = 3600 seconds
46 mph = 20.5594 meters per second
Energy=(m*v2)/2 = (2.14334762 kg * 20.55942) / 2 = 452.98 joule
Wiki User
∙ 13y ago
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Which has the most kinetic energy a 1000 kg car traveling 30 ms or a car traveling 45 ms?
WOW, 5 MILES PER SECOND. I guess that I would have to calculate the miles per hour. To do this, we must multiply 5 miles per second times 3600(the number of seconds in an hour). That is 18000 miles per hour. I like to work in the SI system, so by converting this to meters per second, we get 8.04672E3 meters per second. Kinetic energy is defined as one half mvsquared. The Kinetic Energy is equal to 3.2374E10 Joules.
What has greater kinetic energy a car traveling at 35 miles per hour or a car traveling at 50 miles per hour?
Kinetic Energy is defined as the energy associated with motion. This is in contrast to potential energy which is associated with an entity's energy at rest, and it's potential for motion. Kinetic Energy can be calculated using this formula: KE = 0.5*Mass*Velocity^2, where KE = Kinetic Energy It is apparent by the formula that the same car traveling at a higher speed will have a greater kinetic energy than it does when traveling at a lower speed. Therefore, when the car travels at 50 mi/hr it has a higher kinetic energy than when it travels at 35 mi/hr. Let me just note that if we were talking about two different cars then we'd have to consider the weights of the cars.
What is the kinetic energy of a 5 kg cat chasing a mouse across the yard at 2 miles per second?
kinetic energy = 1/2 * mass *(velocity)^2 = 1/2 * 5 * 2 * 2 = 10 joules
Describe the change in kinetic energy when the temperature of an object increases?
The more an objects kinetic energy increases the more it's temperature increases. An object that is traveling at 30 miles per hour will have a higher temperature than an object traveling at 10 miles per hour. This is in part due to friction. Mostly however, it is due to the fact that kinetic energy excites atoms in the object raising the objects temperature. You could put it like this: temperature = energy + atoms. Hope this helps.
How many joules of kinetic energy does a 750 kg car traveling at 65 mi hr have. By what factor would its kinetic energy decreases if the car travel half as fast?
For this question, we will use the formula K = 1\2 mv2. But first, we must convert the 65 miles per hour into meters per second. Multiply miles per hour by a factor of 1.609 to get kilometers per hour. Divide this answer by 3600 to get kilometers per second. Multiply this by 1000 to get meters per second. In this case, the velocity in meters per second is aproxamitely 29 meters per second. To get the kinetic energy, we multiply one half, times the mass 750 kg, times 292 meters per second. This yields 315375 Joules. If we halved the velocity, the kinetic energy would be one-fourth that of the original kinetic energy. This is because the velocity is squared. This holds true if we go to one third the original speed. Then it would be one-ninth of the original kinetic energy.
What is the kinetic energy of a 62.0 g tennis ball being served across court at 150 km per hour ( 94 miles per hour)?
It is 53.8 Joules, approx.
What is the kinetic energy of a 900 kg car moving 80 miles per hour?
The kinetic energy is one half the mass times the velocity squared KE = 1/2 mv^2 First you cannot mix English and metric units, so you need to convert miles per hour to meters per second and your answer will be in kg m^2/sec^2 or joules 80 mph = 35.76 meters per second KE = 1/2 (80) x (35.76)^2 = 51,151 joules
Define kinetic energy in terms of temperature?
The reverse is usually done .... Define temperature in terms of KE. The temperature of a body is proportional the the average Kinetic Energy of the particles (molecules or atoms) that make up the body. Can't be done the other way because a car traveling at 60 miles per hour has Kinetic energy which has nothing to do with temperature. The car doesn't care if is 100 degrees or 20 degrees.
What would the kinetic energy of a rock sitting on the ground be?
Zero. You need to think in terms of "frame of reference" as in what are you comparing the rock to. If you are an observer sitting next to the rock then the kinetic energy of the rock RELATIVE TO YOU is zero - I.E. the rock isn't moving relative to you and thus has no kinetic energy - energy of motion - relative to you. If you are an observer sitting a million miles from earth watching the rock then it is zipping around at 1000 miles per hour as the earth spins on its axis and it has significant kinetic energy RELATIVE TO YOU. You need to think in terms of "frame of reference" as in what are you comparing the rock to. If you are an observer sitting next to the rock then the kinetic energy of the rock RELATIVE TO YOU is zero - i.e. the rock isn't moving relative to you and thus has no kinetic energy - energy of motion - relative to you. If you are an observer sitting a million miles from earth watching the rock then it is zipping around at 1000 miles per hour as the earth spins on its axis and it has significant kinetic energy RELATIVE TO YOU. ---- So we don't get bored, no kinetic and no gravitational potential energy.
How many joules of kenetic energy does 1 kg book have when it is tossed across the room at a speed of 2 miles per second?
Needs conversion. 2 m/s (1609 meters/1 mile) = 3218 meters per second ( fast!! ) Kinetic Energy = 1/2(mass)(velocity in meters per second)^2 KE = 1/2(1 kg)(3218 m/s)^2 = 5177762 Joules ( 5.2 X 10^6 Joules ) --------------------------------------------------
What has the most mechanical kinetic energy?
a car going 60 miles per hour
What energy transformation is it when a driver fills his car with gas then drives three hundred miles?
The major conversions are chemical energy in the fuel to heat energy in the cylinders to kinetic energy of the car. Other changes involved include chemical energy in the driver's food to kinetic energy in his muscles to operate the pump, and electrical energy in the pump to kinetic energy of the fuel as it flows into the car.
