Which is a tool used by scientists to determine the composition of objects?

a. a hologram
b. a spectrometer
c. a wave front
d. a prism

Acar travels along a highway with a velocity of 24 m/s, west. the car exits the highway; and 4.0 s later, its instantaneous velocity is 16 m/s, 45° north of west. what is the magnitude of the average acceleration of the car during the four-second interval?

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c