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Physics

Isabelle Murphy

After harvesting their main crops, such as corn and wheat, many farmers plant a second crop called a cover crop. This cover crop grows during the fall and winter and is then plowed over in the spring. What is the main purpose of a cover crop?

A.

to get rid of excess seed rather than storing during the winter

B.

to provide food and shelter for birds and animals during the winter

C.

to prevent water runoff into other parts of the farmers' field

D.

to prevent erosion of the topsoil by wind and water

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Physics

Cunningham

A light wave is traveling straight up out of the ocean then moves out into the air how do you expect the movement of the light wave to change the light wave will

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Physics

Brian Lam

To verify that this expression for (vf) α has the correct units of velocity, you need to perform some unit analysis. begin by finding the equivalent of a volt in terms of basic si units. what is a volt in terms of meters (m), seconds (s), kilograms (kg), and coulombs (c) ?

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Physics

Luci

Which of the following best describes transverse waves

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Physics

Janetta

What are the arrangement of resistors in series

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Physics

Kingston Goodwin

A pilot flies horizontally at 1300 km/h, at height h! 35 m above initially level ground. However, at time t! 0, the pilot begins to fly over ground sloping upward at angle u! 4.3° (Fig. 2-38). If the pilot does not change the airplane's heading, at what time t does the plane strike the ground?

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Physics

Lyric Wallace

A helicopter flies 30 km 30 degrees north of east, drops of the supplies to a research team; it then heads 50 degrees north of west traveling 70 km to drop the supplies to a filming crew. What is the resultant displacement of the helicopter?

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Physics

Boomhauer

Plaskett's binary system consists of two stars that revolve in a circular orbit about a center of mass midway between them. This statement implies that the masses of the two stars are equal (see figure below). Assume the orbital speed of each star is |v with arrow| = 160 km/s and the orbital period of each is 13.7 days. Find the mass M of each star. (For comparison, the mass of our Sun is 1.99 1030 kg.)

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Physics

Angeline Guzman

Is mercury (the planet) rocky or gaseous (meaning relating to or having the characteristics of a gas.)

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Physics

Peter Pennington

What does one prolonged blast emitted by boat a using an efficient sound producing device indicate?

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Physics

Stevens

Feng and Isaac are riding on a merry-ground. Feng rides on a horse at the outer rim of the circular platform, twice as far from the center of the circular platform as Isaac, who rides on an inner horse. When the merry-go-round is rotating at a constant angular speed, what is Feng's angular speed?

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Physics

Noelle Barr

Alice did an experiment to find the relationship between the angle at which a ray of light strikes a mirror and the angle at which the mirror reflects the light. She placed a ray box in front of a mirror. She changed the angle at which the light from the ray box struck the mirror and noted the corresponding angle at which the mirror reflected the light.

Which of the following is the dependent variable in this experiment?

A. The mirror used to reflect the light

B. The ray box used as the source of light

C. The angle at which the light from the ray box strikes the mirror

D. The angle at which the mirror reflects the light from the ray box

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Physics

Joy Greer

When the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isJ.

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Physics

Jeremiah Glover

How do most primary producers make their own food?

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Physics

Jaslene Rogers

The maximum kinetic energy of photoelectrons is 3.10 ev. when the wavelength of the light is increased by 50%, the maximum energy decreases to 1.50 ev. part a what is the work function of the cathode?

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