The force needed to make an object move in a circle is

a. centripetal force
b. weight
c. kinetic friction
d. static friction
e. none of the above


A

Physics & Space Science

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Specific Heat: In a flask, 114.0 g of water is heated using 67.0 W of power, with perfect efficiency. How long will it take to raise the temperature of the water from 15°C to 25°C? The specific heat of water is 4186 J/kg ? K.

A. 71 s B. 4.1 s C. 17 s D. 320,000 s

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At the lower left of the Hertzprung—Russell diagram we find

A) supergiant stars B) red giant stars C) white dwarfs D) main sequence stars

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Which of the following quantities is directly proportional to the time interval after a projectile has left the barrel that shot it out? The x axis is horizontal; the y axis is vertically upward.

A.


B.
?ay

C.
?y

D.

E.
?vy

Physics & Space Science

What are the minimum and maximum values for right ascension in the sky?

What will be an ideal response?

Physics & Space Science