An astronomical telescope has its two lenses spaced 82.1 cmcm apart. If the objective lens has a focal length of 78.0 cmcm, what is the magnification of this telescope

A person sitting in a chair with wheels stands up, causing the chair to roll backward across the floor. How would you describe the momentum of the chair?

Which of the following statements is not consistent with the properties of a molecular solid? a. a compound that conducts electricity when molten b. a low melting solid c. a solid that is a nonconductor of electricity d.

Ball 1, with a mass of 150 g and traveling at 15 m/s, collides head on with ball 2, which has a mass of 350 g and is initially at rest.

A 4.5 kg box slides down a 4.3-m-high frictionless hill, starting from rest, across a 2.0-m-wide horizontal surface, then hits a horizontal spring with spring constant 510 N/m. The other end of the spring is anchored against a wall.

If you drop a stone from height of 2.5m. what is the speed of the stone right before it hits the ground?

Which best states the author's argument in catching sun rays? no power source is clean, free, and renewable. it costs too much to use solar energy for power. the use of solar energy can cause blackouts in big cities.

A possible means of space flight is to place a perfectly reflectingaluminized sheet into orbit around the Earth and then use the lightfrom the Sun to push this "solar sail." Suppose a sail of area5.

An electric circuit consists of a variable resistor connected to a source of constant potential difference. If the resistance of the resistor is doubled, then

What would happen if an electron was added to an atom

Is a stick living, non living or Dead?