What wave is used reflecting from the ionosphere?

What is the wavelength of 7.0-TeV protons? A) 550 nm B) 750 nm C) 5.4x10^-15 m D) 3.2x10^-18 m E) 1.8x10^-19 m

Express angular displacement in radians

Newton's first law A. describes how an object accelerates when a force is applied B. says that objects eventually stop unless a force is applied C. says that objects with mass attract each other D. forces come in action/reaction pairs E.

A 12 volt car battery is connected to a 3 ohm brake light. What is the current carrying energy to the lights?

Two cars are driving at the same constant speed on a straight road, with car 1 in front of car 2. car 1 suddenly starts to brake with constant acceleration and stops in 10 m.

What techniques allow us to identify the presence of different elements?

A small piece of dust of mass m = 4.1 µg travels through an electric air cleaner in which the electric field is 466 N/C. The electric force on the dust particle is equal to the weight of the particle.

a race car driver must average 203 km/h over the course of a time trial lasting ten laps. If the first nine laps were done at 199.0 km/h what average speed must be maintained for the last lap?

If a person paddling only on the left side of a boat. In which direction will the boat go?

What is the density of cylindrical (coin) object if it has a mass of 0.69 kg, and a radius of 0.03 m, along with a thickness of 0.003 m?