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Physics

Jensen Cummings

What fraction of a piece of concrete will be submerged when it floats in mercury? the density of concrete is 2.3*103kg/m3 and density of mercury is 13.6*103kg/m3?

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Physics

Terrence Schmitt

How many days does it take for the moon to go around earth

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Physics

Kendall Mejia

What are the different types of limiting factors found in nature?

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Physics

Leroy Mclean

A solid form from liquid reactants during a chemical reaction

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Physics

Princess

If an object-spring system is hung vertically and set into oscillation, why does the motion eventually stop?

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Physics

Alan Watson

What is the unit measurement for pain relief tablets and is it SI units Or English system?

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Physics

Guapo

Which best describes convection?

It relies on the collision of particles within or between substances.

It occurs in solids, liquids, or gases that are heated.

It results when portions of a liquid cool and rise.

It is driven by temperature differences within a fluid.

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Physics

Max Schaefer

A 384 m long train is moving on a straight track with a speed of 77.3 km/h. The engineer applies the brakes at a crossing, and later the back of the last car passing the crossing with a speed of 19.5 km/h. Assuming constant acceleration, determine how long the train blocked the crossway. Disregard the width of the crossing. Convert the time into three different units: s, min, and hr.

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Physics

Catherine Melendez

If a girl is standing in front of a smooth surface from which a sound is reflected the girl may hear

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Physics

Sienna Sosa

The buoyant force acting on an object is always equal to

A. the weight of the submerged portion of the object

B. the mass of the submerged portion of the object

C. the weight of the fluid the object displaces

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Physics

Moises Andrews

Which of the following statements are true about gravity? Check all that

apply.

A. Gravity doesn't exist between two stars that are far far away from

each other.

B. Gravity exists only near Earth.

C. Gravity exists between two objects, but only when they're close

enough to affect each other.

D. Gravity is a force that pulls two objects together.

E. Gravity exists between two objects that have mass,

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Physics

Zachery Craig

A ball which is dropped from the top of a building strikes the ground with a speed of 30m/s. Assume air resistance can be ignored. The height of the building is approximately

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Physics

Dorian Macias

Water in central Texas comes from the Edwards

Aquifer and tends to be hard. Which of the

following would you expect to find in this water?

O A. Carbon dioxide

O B. Calcium ions

O C. Biotic factors

O D. Oxygen gas

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Physics

Jesse Faulkner

As you found in Part A, your weight will be greater than normal when the elevator is moving upward with increasing speed. For what other motion would your weight also be greater than your normal weight?

A) The elevator moves upward with constant velocity.

B) The elevator moves downward with constant velocity.

C) The elevator moves upward while slowing in speed.

D) The elevator moves downward while slowing in speed.

E) The elevator moves downward while increasing in speed.

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Physics

Jasmin Kaiser

Which of the following lists contains only examples of renewable sources of energy?

A. wind, tidal, geothermal, and hydroelectric

B. coal, solar, wind, and biomass

C. fossil fuels and nuclear energy

D. hydroelectric, petroleum, solar, and wind

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