How much work does the up escalator do on you when you ride it from the lower level to the upper level?

How many places are there for electrons in the third shell of an atom?

A negative charge of - 2.0 C and a positive charge of 3.0 C are separated by 72 m. What is the force between the two charges?

2. Rank the following in terms of increasing pressure: A. A 10 kg object distributed on a square surface with dimensions 10 cm by 10 cm B. A 20 kg object distributed on a square surface with dimensions 10 cm by 10 cm C.

A wave has a period of 4 seconds. What is its frequency?

Which of the following factors can negatively affect development? a. Political corruption and instability b. Lack of resources c. Lack of education d. All of the above

Differeniate between thermal energy and heat

The term that describes the time when the sun's are directly over the equator is:

A submarine can detect an approaching enemy submarine using sonar. If a stationary submerged submarine emits a 100kHz tone and receives a tone Doppler shifted by 200Hz, calculate the speed of the enemy submarine if the speed of sound in salt water

The planet Krypton has a mass of 7.6 * 1023 kg and radius of 1.7 * 106 m. What is the acceleration of an object in free fall near the surface of Krypton? The gravitational constant is 6.6726 * 10-11 N · m2 / kg2. Answer in units of m/s 2.

An input force of 50. newtons is applied through a distance of 10. meters to a machine with a mechanical advantage of 3.