2.how would the kinetic energy of a 12,000-kg train compare with the kinectic energy of a 900-kg compact car if both were traveling at the same speed?
A.the trains kinectic energy would be equal to the cars kinectic energy.
B.the trains kinectic energy would be greater than the cars kinectic energy.(I pick B.)
C.the trains kinectic energy would be less than the cars kinectic energy.
(1/2) m v^2 is certainly bigger for the train because (1/2) is the same and v^2 is the same but m is MUCH MUCH bigger
so I agree, B
is it b??????
The kinetic energy of an object is given by the formula:
KE = (1/2)mv^2
where KE is the kinetic energy, m is the mass of the object, and v is the velocity of the object.
In this case, let's assume that both the train and the compact car are traveling at the same speed, which we'll call v.
For the train:
Mass (m1) = 12,000 kg
For the compact car:
Mass (m2) = 900 kg
Since both objects are traveling at the same speed v, we can compare their kinetic energies by simply comparing their masses.
Given that the mass of the train (12,000 kg) is greater than the mass of the compact car (900 kg), we can conclude that the kinetic energy of the train will be greater than the kinetic energy of the car.
Therefore, the correct answer is B. The train's kinetic energy would be greater than the car's kinetic energy.
To compare the kinetic energy of the train and the compact car, we need to use the formula for kinetic energy:
Kinetic energy = 1/2 * mass * velocity^2
Given that both the train and the compact car are traveling at the same speed, the velocity term can be ignored. Now we can calculate the kinetic energy for each given the mass of the train and the mass of the car.
Kinetic energy of the train = 1/2 * 12,000 kg * velocity^2
Kinetic energy of the car = 1/2 * 900 kg * velocity^2
Comparing the two equations, we can see that the kinetic energy depends on the mass of the object. The train has a mass of 12,000 kg, which is much greater than the car's mass of 900 kg. Therefore, the train's kinetic energy will be greater than the car's kinetic energy.
So, the correct answer is B. The train's kinetic energy would be greater than the car's kinetic energy.