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
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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.
If the temperature of a wire increases, its resistance __________
Fill in the blank(s) with correct word
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.
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?