Marie Curie is famous for
A) her studies of radioactivity.
B) her studies of nuclear fusion.
C) her invention of the X-ray laser.
D) her discovery of fission.
E) her invention of the electron microscope.
A
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When an external resistor of resistance R1 = 14 ? is connected across the terminals of a battery, there is a current of 6.0 A through the resistor
When a different external resistor of resistance R2 = 64.4 ? is connected instead, the current is 2.0 A. Calculate (a) the emf of the battery and (b) the internal resistance of the battery.
A 50.0 mm lens is used to take a picture of an object 1.30 m tall located 4.00 m away. What is the height of the image on the film?
A. 21.0 mm B. 16.5 mm C. 12.0 mm D. 10.5 mm E. 9.20 mm
In an inertia balance, a body supported against gravity executes simple harmonic oscillations in a horizontal plane under the action of a set of springs. If a 1.00-kg body vibrates at 1.00 Hz, a 2.00-kg body will vibrate at
a. 0.500 Hz. b. 0.707 Hz. c. 1.00 Hz. d. 1.41 Hz. e. 2.00 Hz.
Of all the stars in the Orion Nebula, only three are hot enough to ionize hydrogen
Indicate whether the statement is true or false