Web designers sometimes measure type size in pixels, where 24 pixels equal a 10-point font.
Answer the following statement true (T) or false (F)
False
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You make a roundtrip to a star located 1000 light-years away (so the roundtrip distance is 2000 light-years in Earth's reference frame) at an average speed of 0.99c. Based on the time dilation formula below, about how long will the trip take, according to you?
t' = t A) 2.8 years B) 10 years C) 28 years D) 280 years E) 2000 years
In a spectroscopic binary system, the star showing the larger blue shift is
A) cooler and receding the fastest. B) less massive of the pair and receding slower. C) more massive and approaching us. D) less massive and approaching us at this moment. E) hotter and receding faster.
A transverse periodic wave is represented by the equation z(y, t) = 1.50 cm sin(1,250 rad/s t + 10.0
y). What is the frequency of the vibration of the wave?
A. 319 Hz B. 289 Hz C. 240 Hz D. 199 Hz E. 150 Hz
The specific heat capacity of copper is three times the specific heat capacity of lead. Equal masses of copper and lead are heated from room temperature to the temperature of boiling water. To achieve this, the amount of heat added to the copper is ___________ the amount of heat added to the lead
a. 1/9 b. 1/3 c. equal to d. 3 times e. 9 times