The color of the powder of a mineral is known as the mineral's

a. index of refraction.
b. hardness.
c. specific gravity.
d. streak.

d

Physics & Space Science

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If the temperature of a wire increases, its resistance __________

Fill in the blank(s) with correct word

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Physics & Space Science

A 100 kg crate is attached to a rope wrapped around the inner disk as shown. A person pulls on another rope wrapped around the outer disk with force F to lift the crate

How much work is done by the person to lift the crate 2 m?

1.about 400 J 2.slightly less than 2,000 J 3.exactly 2,000 J 4.slightly more than 2,000 J 5.much more than 2,000 J 6.Impossible to determine without knowing F 7.Impossible to determine without knowing the radii 8.Impossible to determine without knowing the mass of the pulley 9.Impossible to determine for two or more of the reasons given in 6, 7, and 8 above 10.Impossible to determine for some other reason(s)

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Physics & Space Science

A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 24 m/s west, and the total acceleration of the car is 2.5 m/s2 53° north of west. Which of the following is correct?

a. R = 0.29 km, and the car's speed is increasing. b. R = 0.23 km, and the car's speed is decreasing. c. R = 0.23 km, and the car's speed is increasing. d. R = 0.29 km, and the car's speed is decreasing. e. R = 0.29 km, and the car's speed is constant.

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Physics & Space Science

The intricate patterns visible in an X-ray image of the Sun generally show

A) helioseismological fluctuations. B) a bubbling pattern on the photosphere. C) extremely hot plasma flowing along magnetic field lines. D) structure within sunspots.

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Physics & Space Science