In his experiment with rolling balls down a ramp at different ramp angles, what did Galileo discover?
a. For any fixed ramp angle, the speed of a ball was always constant, regardless of its weight.
b. For any fixed ramp angle, the acceleration of a ball was always constant, regardless of its weight.
c. For any fixed ramp angle, the velocity of a ball was always constant, regardless of weight.
d. The velocity and acceleration were both constant.
e. The heavier balls rolled down the ramp faster.
b
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By operating a reversible heat engine with an ideal gas as the working substance in a Carnot cycle and measuring the ratio Qc /Qh, we can calculate
A. n, the number of moles of the ideal gas. B. the ratio Vc /Vh of the volumes of the ideal gas. C. the ratio Pc /Ph of the pressures of the ideal gas. D. the ratio PcVc /PhVh of the products of volumes and pressures of the ideal gas. E. the value of Avogadro's number.
The absolute magnitude scale is defined so that a difference of five magnitudes is a luminosity difference of ________
Fill in the blank(s) with correct word
What causes the seasons?
A. the elliptical shape of Earth's equator B. the changing distance between Earth and the Sun C. Earth's spin axis is tilted from the poles of the celestial sphere D. the tilt of Earth's spin axis relative to Earth's orbit
If the relative mass of a hydrogen atom is 1/4 that of a helium atom, how many helium atoms would you need to equal the mass of 200 hydrogen atoms?
A) 50 B) 200 C) 800 D) 4 E) 100