Two spring-loaded ballistic carts, one of 200 g and the other 800 g, are released and the lighter cart is observed to move at +1 m/s afterward. What is the velocity of the other cart?
A. -0.25 m/s
B. +0.25 m/s
C.-4 m/s
D. +4 m/s

Which of the following changes will result in a stronger electromagnet? a. using fewer coils of wire b. using a higher voltage c. using a shorter nail d. using a longer wire

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s.part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.

Which radioisotope is used in dating geological formations?