A car travels in a due northerly direction at a speed of 55 km/h. The traces of rain on the side windows of the car make an angle of 60 degrees with respect to the horizontal. If the rain is falling vertically with respect to the Earth, what is the speed of the rain with respect to the Earth?
a. 48 km/h
b. 95 km/h
c. 58 km/h
d. 32 km/h
e. 80 km/h
b
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Why are telescopes sometimes called "time machines"?
A) because the author, H.G. Wells, used the term to describe telescopes in a book B) because some of the oldest telescopes are still in use today C) because observations of distant objects reveal them as they were in the past D) because astronomers can use telescopes to see the Milky Way as it was when it was much younger E) It's a journalistic misnomer: you cannot travel into the past or the future.
100 grams of molten lead (600°C) is used to make musket balls. If the lead shot is allowed to cool to room temperature (21°C), what is the change in entropy (in J/K) of the lead? (For the specific heat of molten and solid lead use 1.29 J/g×°C; the latent heat of fusion and the melting point of lead are 2.45 × 10^4 J/kg and 327°C.)
a. -145 b. -252 c. -302 d. -429 e. -100
In a parallel circuit, the size of the current flowing through each device may be different
Indicate whether the statement is true or false
A lightweight object and a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greater height?
A) The heavy object, because it has greater kinetic energy. B) The light object, because it has smaller kinetic energy. C) The lightweight object, because it weighs less. D) The heavy object, because it weighs more. E) They both slide to the same height.