PLS HELP Which type of force is a contact force?
A. Electromagnetic force
B. Friction
C. Strong nuclear force
D. Gravity
SUBMT

What is the relationship of air masses and the temperature of oceans?

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.