When scientists identify the age of a fossil they

a. place it in a time period

b. cut it up.

c. decide if it's valuable.

d. decide what continent it belongs on.

Blue light of wavelength 450 nm passes through a diffraction grating with a slit spacing of 0.001 mm and makes an interference pattern on the wall. How many bright fringes will be seen? A. 1 B. 3 C. 5 D. 7

A rubber band has a spring constant of 15 N/m. If you stretch it by 0.3 m, what is the magnitude of the force that resists the stretching? O A. 6.2 N B. 4.5N O C. 5.0 N O D. 3.0N

The light intensity of a source in 100 candelas. The illuminance on a surface is 4 lux. How far is the surface from the source?

Electrical current in a wire

Why are physicists hired to work at car companies?

Why is it useful for pairs of DNA to be held together by men bonds and not covalent bonds?

World class speed skaters can skate a 3,000-m course in about 4 minutes. What is their average speed for this course? A. 12.5 m/s B. 1.33 m/s C. 1.25 m/s D. 13.3 m/s

A building that is 105.50 ft. feet tall is casting a shadow that is 37.50 ft. feet. If the building next to it, is casting a shadow of 41.00 ft. feet, how tall is that building?

What is the technical name for super glue type adhesives

On his fishing trip Justin takes the boat 25 km south. The fish aren't biting so he goes 10 km west. He follows a school of fish 15 km north. What distance did he cover? What was his displacement?