An elevator weighing 6,000 N moves up a distance of 10.0 meters in 30.0 seconds. a. How much work did the elevator's motor do? b. What was the power of the elevator's motor in watt and in horsepower?

Electromagnetic waves A. All have the same wavelength B. Do not carry energy C. Can travel through empty space D. All have the same frequency

How does the diameter of the disk of milky way galaxy compare to its thickness?

Which of the following types of particles can be categorized into different kind of elements? A. Protons B. Atoms C. Electrons D. Neutrons

A total Δν of 15 km/s is required to achieve an interplanetary mission. The proposed rocket has two stages. The first stage alone has a mass of 1000 tonnes and consists of 10 solid rocket boosters and a liquid rocket motor.

What do scientists call the theory that the universe will shrink in the future? a. Collapse theory c. Blue-shift deterioration b. The Big Crunch d. The Big Collapse

Which statement about magnetic poles is accurate? A) Same magnetic poles attract, while different magnetic poles repel. B) Same magnetic poles attract, while different magnetic poles attract.

Power is measured in: A) J/s B) J2/s C) s/J D) s2/J

The amount or the strength of force is called its

An airplane in flight has a pressure difference between the lower and upper wing surface; this provides an upward force that balances the weight of the plane.

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