In order to reduce bias, scientists usually prefer experiments that lead to what kind of results?

a. ambiguous
b. imprecise
c. quantitative
d. qualitative
e. subjective


c

Physics & Space Science

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In a two-dimensional Cartesian coordinate system the y-component of a given vector is equal to that vector's magnitude multiplied by which trigonometric function, with respect to the angle between vector and y-axis?

a. sine b. cosine c. tangent d. cotangent

Physics & Space Science

Twenty grams of a solid at 70°C is place in 100 grams of a fluid at 20°C. Thermal equilibrium is reached at 30°C. The specific heat of the solid:

a. is equal to that of the fluid. b. is less than that of the fluid. c. is more than that of the fluid. d. cannot be compared to that of a material in a different phase.

Physics & Space Science

A 5-g coin is dropped from a 300-m building. If it reaches a terminal velocity of 45 m/s, and the rest of the energy is converted to heating the coin, what is the change in temperature (in °C) of the coin? (The specific heat of copper is 387 J/kg×°C.)

a. 9 b. 2 c. 5 d. 21 e. 0.5

Physics & Space Science

Which galaxies contain less than 1,000 galaxies?

a. obtuse b. middle class c. poor d. rich

Physics & Space Science