The presence of which gas makes the planets Uranus and Neptune appear blue?

a. helium

b. hydrogen

c. methane

d. nitrogen

Calculate the wave length of a water wave with a speed of 20 m/s and a frequency of 2.5 Hz A. 2 B. 5 C. 8 D. 12

In which group is hydrogen located on the periodic table?

Are energy transformations always efficient

Which statement is true about a polarized object?

Gold is used to make a super thin layer on the visors of astronauts' helmets because of which property in particular? A. rare B. malleable C. good reflector of heat D. good conductor of electricity

18. Which does not affect the strength of an electromagnet? A the current in the solenoid B the temperature of the coil OC the number of loops in the coil D the type of ferromagnetic core

What causes the electric charges to flow from one end of the battery to the other? a balance in electric potential a balance in resistance a difference in electric potential a difference in resistance

What is one exsample of a closed economy

A transfer by work from the system, an elevation decrease of 50 m, and an increase in velocity from 15 m/s to 30 m/s. The specific internal energy, u, decreases by 5 kJ/kg and the acceleration of gravity is constant at 9.7 m/s².

What is the best prediction for the weather on the day after high pressure system passes