A simple model of the hydrogen atom suggests that the electron orbits the proton. What is the

force that keeps the electron in orbit?

A. Electrostatic

B. Gravitational

C. Strong nuclear

D. Centripetal

which theory states that all of the life on the planet is decended from an orginal life form that lived 3.5 billion years ago

Technician A says that vehicle-to-vehicle communication results in fewer traffic collisions. Technician B says there are concerns related to cybersecurity and a loss of privacy.

Calculate the change in momentum of a 10kg object that has an initial speed of 15m/s and slows to 8 m/s. If this change occurs over a time of 3s, what force caused the change?

Almost all of the electricity that people use is produced by 1. motors. 2. batteries. 3. transformers. 4. generators.

Why is it impossible to create a perpetual motion machine?

A conductor, with outer surface labelled a, contains a cavity, inner surface b. In this cavity there is a conducting sphere of radius r, and surface c. The sphere carries a charge of 1 C, while the conductor a charge of 2 C.

In a frictionless environment, which energy stays the same? 1. Kinetic Energy 2. Potential Energy 3. Internal Energy 4. Total Mechanical Energy

In what order do the earth, sun, and moon line up in a totla solar eclipse

17. Ice has a water. albedo than land or O A. similar O B. opposite O c. higher O D. lower

When you put your hands on a cold object like a glass of ice water your hands become?