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Physics

Aimee Hogan

What is the SI unit of emf

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Physics

Melina Rice

What is a quantity with only magnithde (no direction).

e.

g. 5 meters?

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Physics

Joel Ayers

Frictional force is ___of area of contact

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Physics

Marcos Ayala

Can you calculate gravitational potential energy by using what type of equation?

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Physics

Martha Murphy

An astronomer is measuring the electromagnetic radiation emitted by two stars, both of which are assumed to be perfect blackbody emitters. For each star she makes a plot of the radiation intensity per unit wavelength as a function of wavelength. She notices that the curve for star A has a maximum that occurs at a shorter wavelength than does the curve for star B. What can she conclude about the surface temperatures of the two stars?

a. Star A has the greater surface temperature.

b. There is not enough information to draw a conclusion about the temperatures.

c. Star B has the greater surface temperature.

d. Both stars, being perfect blackbody emitters, have the same surface temperature.

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Physics

Mara Branch

Which of the following is true? A depression is a recession that is mild and relatively brief. The expansions and contractions of real world business cycles last varying lengths of time and often differ in magnitude. The timing of business fluctuations is regular and therefore easily predictable. During the contractionary phase of the business cycle, the rate of unemployment is generally quite

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Physics

Julie

A pure lead bar 10 cm long is maintained with one end at T=300 K and the other at 310 K. The thermoelectric potential difference thus induced across the ends is 12.8? V. Find the thermoelectric power for lead in this temperature range

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Physics

Tomas Mueller

Is there any science behind unicorns / pegasis?

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Physics

Ruffe

Rays traveling parallel to the principle axis of a concave mirror will reflect out through the mirrors focus?

a. true

b. false

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Physics

Zeke

Which of the mixtures in figure 1 is a solution?

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Physics

Peter Sullivan

Light is traveling in air at a speed of 300,000 km/s. Which substance would cause the light to refract the LEAST?

A.

ruby (speed of light = 170,000 km/s)

B.

glass (speed of light = 200,000 km/s)

C.

water (speed of light = 225,000 km/s)

D.

diamond (speed of light = 120,000 km/s)

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Physics

Cory Morrison

What is table salt (NaCl) formed by?

The combination of two nonmetals.

The splitting apart of a metal and a nonmetal.

The combination of a metal and a nonmetal.

The combination of two metals.

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Physics

America Petersen

Why does an electrically heated mirror stay clear when a person has a shower?

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Physics

Ruby

A car travels 30.0 km to the south and then turns around and travels 20.0 km to the north in 1.5 hours time. What is the car's total displacement? What is the car's average velocity?

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Physics

Katherine

What is an ore?

a metal

a rock that contains a nonmetal resource

a nonmetal resource

a rock that contains a metal resource

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