01. Car 1 was sitting at rest when it was hit from the rear by car 2 of identical mass. Both
cars had their breaks on and they skidded together 6 m in the original direction of motion.
If the stopping force is ~ 0.7  (combined weight of the cars) , i. e.,  = 0.7, find the
approximate speed of car 2 just before the collision took place. [18.14 m/s

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.

In a heat engine if 1000 j of heat enters the system and the piston does 500j of work, what is the final internal energy of the system if the inital energy was 2000 j1.write the equation2.list out your known variables 3. plug the numbers into the equations4.solve 5.write your solution statement that includes initial energy and final energy added.

An electromagnetic wave with frequency 65.0 hz travels in aninsulating magnetic material that has dielectric constant 3.64 andrelative permeability 5.18 at this frequency. the electric fieldhas amplitude 7.20 \times 10^{ - 3} {\rm v}/{\rm m}. a. what is the speed of propagation of the wave? b. what is the wavelength of the wave? c. what is the amplitude of the magnetic field? d. what is the intensity of the wave?