Which one of the following types of electromagnetic radiation causes certain substances to fluoresce?
a. ultraviolet rays
b. infrared waves
c. cosmic rays
d. x rays

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

Acar starts from rest at a stop sign and reaches a velocity of 25 m/s w in 4 seconds. determine the acceleration of the car. question 3 options: a) 6,25 m/s2 b)6.25 m/s c)100 m/s2 d)100 m/s

The friction of the water on a boat produces an acceleration of -10. m/s2. if the boat is traveling at 30. m/s and the motor is shut off, how long it take the boat to slow down to 5.0 m/s?