Atomic number refers to the number of
A) protons in the nucleus.
B) neutrons in the nucleus.
C) nucleons in the nucleus.
Answer: A
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The amount of heat necessary to change the temperature of 1 kg of a substance by 1°C is called the substance's
A. specific heat. B. latent heat. C. heat of combustion. D. mechanical equivalent of heat.
Lonnie pitches a baseball of mass 0.15 kg. The ball arrives at home plate with a speed of 40 m/s and is batted straight back to Lonnie with a return speed of 60 m/s. If the bat is in contact with the ball for 0.050 s, what is the impulse experienced by the ball?
a. 360 N•s c. 400 N•s b. 20 N•s d. 15 N•s
A copper bar (d 5 10 mm, E 5 110 GPa) is loaded by tensile load P 5 11.5 kN. The maximum shear stress in the bar is approximately:
(A) 73 MPa
(B) 87 MPa
(C) 145 MPa
(D) 150 MPa
Why argument did the Aristotelian school present to reject the concept of Aristarchus that the Earth could be revolving around the Sun? Why was it wrong?
What will be an ideal response?