The process of boiling that occurs in water tends to _______.
a. have no effect on the water's temperature
b. warm the water
c. both warm and cool the water at the same time
d. cool the water
Answer: d. cool the water
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In its ________ stage, the new protostar's solar winds will form bi-polar jets as the star's magnetic field intensifies
Fill in the blank(s) with correct word
In an electrical circuit, the number of "amperes" measures the
A) amount of thermal energy produced in the circuit. B) amount of electric current consumed by the circuit elements. C) amount of electric current flowing around the circuit. D) amount of energy given to each coulomb of electrical charge. E) voltage around the circuit.
The focal lengths of the objective and the eyepiece in a microscope are 0.29 cm and 2.50 cm, respectively
An object is placed at 0.30 cm from the objective lens and the image of this object is viewed with the eyepiece adjusted for minimum eyestrain (with the eye focused at the far point). The near point of the person using the microscope is 25 cm and the far point is at infinity. What is the final overall magnification of the microscope? A) -470 x B) -190 x C) -240 x D) -320 x E) -300 x
What prevents gravity from pulling you through the ground to the center of the Earth? Choose the best answer
1.They repel each other. 2.They attract each other. 3.They may attract or repel each other, depending on whether the charge on the insulator is positive or negative. 4.They exert no electrostatic force on each other. 5.The charged insulator always spontaneously discharges.