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Physics

Tyrone Davies

An ice skater has a moment of inertia of 5.0 kgm2 when her arms are outstretched. at this time she is spinning at 3.0 revolutions per second (rps). if she pulls in her arms and decreases her moment of inertia to 2.0 kgm2, how fast will she be spinning?

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Physics

Aliza Estes

What is the use of infrared rays?

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Physics

Oliver

What would be the acceleration of gravity of a planet with four times the mass of Earth but twice the radius?

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Physics

Dominique Randolph

A mover hoists a 200 kg piano from the ground to a height of 10 m using a single pulley. What was the change in the pianos energy? a. 20j b. 200j c. 2000j d. 20000

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Physics

Irvin Lloyd

When you hear sound pulses (beats), describe how you will determine the beat frequency. Include in your answer what steps you will take to reduce percentage uncertainty, as well as how you will turn raw measurements into your final answer.

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Physics

Morgan Lynch

An elevator has mass 600 kg, not including passengers. the elevator is designed to ascend, at constant speed, a vertical distance of 20.0 m (five floors) in 16.0 s, and it is driven by a motor that can provide up to 40 hp to the elevator. what is the maximum number of passengers that can ride in the elevator? assume that an average passenger has mass 65.0 kg

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Physics

Serena Santiago

Suppose that 100g of aluminum at 23 degrees C is added to 50g of water at 95 degrees C. Determine the equilibrium temperature of the mixture. Ignore heat loss to the container or the surroundings.

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Physics

Sheldon Li

Which property of coal makes it ideal for use in a power plant? Check all that apply.

It burns easily.

It makes ash.

It is renewable.

It produces a lot of energy.

It contains mercury.

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Physics

Elisa Rangel

Bob is coming toward you at a speed of 75 km/hr. You throw a baseball in his direction at 75 km/hr. What does he see the ball doing?

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Physics

Case Chapman

Give 3 examples of something with potential energy.

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Physics

Kyle Cortez

A graph that shows that the pressure of a gas varies inversely with its volume under constant temperature demonstrates

A. The pressure law

B. The density law

C. Charle's law

D. Boyle's law

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Physics

Starr

5. Why should the electrons be placed separate from each other (why not together) ?

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Physics

Guest

A battery high rate discharge (load capacity) test is being performed on a 12 volt battery. Technician A says that a good battery should have a voltage reading of higher than 9.6 volts while under load at the end of the 15-second test. Technician B says that the battery should be discharged (loaded) to twice its CCA rating. Which technician is correct?

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Physics

Lana Livingston

The number of significant digits in the mass of a body measuring 4200.0 kg is 2.

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Physics

Brandi

Two forces of intensities 3 N and 4 N act simultaneously on a body. If these forces have the same direction and sense, what is the intensity of the resulting force?

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