A rock rolls down a steep hill. it's initial velocity is 1 meter per second. by the time it reaches the bottom of the hill 30 seconds later, it's velocity is 7 meters per second. what is the acceleration of the rock?

Do you think any significant discoveries have been made from errors? Can you describe one?

Stars go through a life cycle. About 90% of all stars are in the main sequence period of the life cycle. Stars are stable during the main sequence period of the life cycle. Why?

A 1,000 kg ball traveling at 5 m/s would have kinetic energy.

What is the momentum of a cat mass of 4 kg that is running south with a speed of 1.5 m/s?

Let's see how much you know about space, so here's a good astronomer question for you (there's 2 questions included in this): 1.) What year does NASA plan on sending people to Mars? (A) 2020 (B) 2021 (C) 2022 (D) 2023 2.

the half-life of carbon - 14 is 5730 years. What fraction of carbon-14 would remain after 11,460 years?

An object with a mass of 10.9 kg experiences a force of 18.53 N. What is the acceleration of the object? A. 2.2 m/s2 B. 1.7 m/s2 C. 16.83 m/s2 D. 1.3 m/s2

A proton, starting from rest, accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.040 T at a right angle to the field. What is the radius of the proton's resulting orbit

Which of the following terms are needed to completely describe speed? Check all that apply. A. Units B. Direction C. Number D. Mass

Drivers are able to see objects ahead of them because light travels through windshields.