Under which stage of sleep are people least responsive to outside stimulation

Two rocks are thrown horizontally at the same time and from the same height. If the initial speeds of rocks A and B are 10 m/s and 15 m/s, respectively, which statement below is true?

A mass spectrometer accelerates doubly ionized atoms of charge 2e over a potential difference V before they enter a uniform magnetic field B which is perpendicular to the direction of motion of the ions.

Question 4 10 pts If the voltage in a circuit is 240 V and the resistance is 10.022, what is the current in Amperes? A. 24 A B. 2400 A C. 2.4A D. 1/24 A

What is the equation for calculating a machine's efficiency? I searched all over my textbook and couldn't find it, so I decided to post my question here.

As a projectile moves down its vertical velocity is positive?

A student in her physics lab measures the standing-wave modes of a tube. The lowest frequency that makes a resonance is 20 Hz. As the frequency is increased, the next resonance is at 60 Hz. What will be the next resonance after this? A. 80 Hz B.

For a satellite to stay in orbit around Earth, it has to be moving forward very fast all the time. What force will make it fall to Earth if it goes too slowly?

A student hangs a balloon from a string then rubs it on their hair and releases it. They rub a second balloon on their hair then move it towards the hanging balloon the moving balloon moves away because ...

Plato and the Soul. A. Plato believed that our souls died with our physical bodies. B. Plato believes our souls were the shadows on the cave walls. C. Plato believed our souls did not exist.

A 1000 kg satellite and a 2000 kg satellite follow exactly the same orbit around the earth. What is the ratio F1/F2 of the gravitational force on the first satellite to that on the second satellite?