Very rapid time variations help establish the tiny size of many X-ray sources, showing they must be collapsed objects of some kind
Indicate whether the statement is true or false
TRUE
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Equal charges, one at rest, the other having a velocity of 104 m/s, are released in a uniform magnetic field. Which charge has the largest force exerted on it by the magnetic field?
A. The charge that is at rest. B. The charge that is moving, if its velocity is parallel to the magnetic field direction when it is released. C. The charge that is moving if its velocity makes an angle of 45o with the direction of the magnetic field when it is released. D. The charge that is moving if its velocity is perpendicular to the magnetic field direction when it is released. E. All the charges above experience equal forces when released in the same magnetic field.
Our Sun, along with most of the stars in our neighborhood, probably formed:
A) a few million years ago. B) about 10 million years ago. C) hundreds of millions of years ago. D) billions of years ago. E) at the beginning of the universe.
Gas in a constant-volume gas thermometer registers a pressure of 95.0 kPa at 100°C. Assuming ideal behavior, what is the temperature of this gas when the pressure is 190 kPa?
A) 546°C B) 527°C C) 491°C D) 473°C E) 200°C
When water freezes, the surrounding air is
1) cooled, 2) warmed, 3) unchanged, and when ice melts, the surrounding air is 4) cooled. 5) warmed. 6) unchanged.