Suppose you have 1 kg each of iron, glass, and water, and all three samples are at 10°C. Rank the samples from lowest to highest temperature after 100 J of energy is added to each by heat. e
1.iron, glass, water
2.water, glass, iron
3.glass, iron, water
4.water, iron, glass
5.iron, water, glass
2
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Which of the following stars is an example of a spectroscopic binary system?
A) Mizar B) Triton C) Europa D) Ceres
Constant Angular Acceleration: A machinist turns on the power to a grinding wheel at time t = 0 s. The wheel accelerates uniformly from rest for 10 s and reaches the operating angular speed of 38 rad/s. The wheel is run at that angular speed for 30 s and then power is shut off. The wheel slows down uniformly at 2.1 rad/s2 until the wheel stops. In this situation, what is the angular acceleration of the wheel between t = 0 s and t = 10 s?
A. 3.8 rad/s2 B. 4.6 rad/s2 C. 5.3 rad/s2 D. 6.1 rad/s2 E. 6.8 rad/s2
When light reflects off an object, what is the relation between the angle of incidence and the angle of reflection?
A) angle of incidence = angle of reflection B) angle of incidence + angle of reflection = 90° C) angle of incidence + angle of reflection = 180° D) angle of incidence - angle of reflection = 90° E) It depends on the material that the light reflects off.
A baseball is thrown straight upward. At the very top of its trajectory its instantaneous velocity is zero and its acceleration is
1) zero. 2) 10 m/s2. 3) between zero and 10 m/s2. 4) none of these. We can better understand this by noting that when it is at its highest point 5) there momentarily is no motion. 6) its rate of change of motion is still 10 m/s2. 7) although its velocity is not changing, its direction is.