The light-gathering ability of a telescope is most dependent on the diameter of its primary objective
Indicate whether the statement is true or false
TRUE
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A medium-mass star becomes a red giant as the result of _______________ fusion in a shell
Fill in the blank(s) with correct word
Equilibrium: An athlete holds a 7.5-kg shot put in his hand with his lower arm horizontal, as shown in the figure. His lower arm has a mass of 2.8 kg and its center of gravity (or center of mass) is 12 cm from the elbow-joint pivot. How much force must the extensor muscle (which is
M in the figure) in the upper arm exert on the lower arm?
A. 100 N B. 500 N C. 1000 N D. 1500 N
An unknown resistor is wired in series and an ammeter and a voltmeter are placed in parallel across both the resistor and the ammeter. This network is then placed across a battery
If one computes the value of the resistance by dividing the voltmeter reading by the ammeter reading, the value obtained A) is the true resistance. B) is greater than the true resistance. C) is less than the true resistance. D) could be anything. It depends on other factors.
Matter Waves: Protons are being accelerated in a particle accelerator. When the energy of the protons is doubled, their de Broglie wavelength will
A. increase by a factor of 4.
B. increase by a factor of 2.
C. decrease by a factor of 2.
D. increase by a factor of 
.
E. decrease by a factor of 
.