Cellular telephones use

a. radar waves

b. very high frequency waves

c. very low frequency waves

d. microwaves

What are two thing the atmidspere do for us?

What is the charge on a hypothetical ion with 35 protons and 33 electrons?

What is "frame of reference?"

What creates a polar front? What forms the polar front jet stream?

A wave has 16 cycles in 208 m of space. It's frequency is 4hz. What is the velocity of the wave

Explain what surface tension is.

A helium-filled balloon is launched when the temperature at ground level is 27.8°c and the barometer reads 752 mmhg. if the balloon's volume at launch is 9.47 * 10^{4} 4 l, what is the volume in liters at a height of 36 km, where the pressure is 73.

Consider the moment when the spring is at its maximum compression. At that moment, the kinetic energy, the gravitational potential energy, and the elastic potential energy are, respectively, a - zero, at a maximum, and at a maximum b - at a maximum,

Ari, a young patient who is regularly treated by a psychiatrist, feels compelled to carry out repetitive tasks the same way very frequently. If Ari does not conduct these tasks with extreme precision, he can feel extremely nervous and uncomfortable.

A friend says, "Stars produce energy by a fusion chain reaction of helium into hydrogen." Evaluate the validity of this statement. A) It is an valid statement. Stars produce energy by a fusion chain reaction of hydrogen into helium.