When a bimetallic bar of copper and iron strips is heated, the bar bends toward the iron strip because
A) iron gets hotter before copper.
B) copper gets hotter before iron.
C) copper expands more than iron.
D) iron expands more than copper.
E) none of the above
Answer: C
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By how much is the energy stored in a Hooke's law spring increased when its stretch is increased from 7.00 cm to 15.00 cm?
a. 159% b. 259% c. 359% d. 459% e. The correct answer is not given.
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 roller-coaster car has a mass of 500 kg when fully loaded with passengers. The car passes over a hill of radius 15 m, as shown. At the top of the hill, the car has a speed of 8.0 m/s. What is the force of the track on the car at the top of the hill?
a.
7.0 kN up
b.
7.0 kN down
c.
2.8 kN down
d.
2.8 kN up
e.
5.6 kN down
The parallax of the stars is very big and can be easily seen with the unaided eye
Indicate whether the statement is true or false