Why is a cathode ray tube connected to a vacuum pump?

A horizontal jet of water is made to hit a vertical wall with a negligible rebound. If the speed of water from the jet is 'v', the diameter of the jet is 'd' and the density of water is 'p', then what is the force exerted on the wall by the jet of

A group of students use a scale to measure the mass of an object. Which of the following would be the appropriate base unit of measurement to use: a meter b Liter c gram d Newton e none of these

All zeros between non-zero digits are significant. true or false

Which shows the correct order of processes leading up to the formation of a main sequence star? a. Gases condense to form a nebula, gravity causes the nebula to collapse and spin, nuclear fusion occurs, and a protostar forms. b.

The relationship between average kinetic energy and air temperture?

A large body of air hats has similar properties of a temperature and moisture is a

An ice rink is 200 feet long and 85 feet wide. The four corners of the rink are rounded to a radius of 24 feet. What is the surface area of the rink? Round the answer to the nearest square foot.

Which statement is correct about gasoline when it is burned? Heat energy is created by the gasoline. The total energy of the gasoline decreases. Chemical energy in the gasoline is destroyed. Chemical energy is transformed into heat energy.

The tilt of the Earth's axis of rotation changes over a period of 41,000 years. Which of these statements best predicts a long term effect of the changes in the tilt of the Earth's axis of rotation? a. The Earth's climate would change. b.

What do keratinized cells form?