The ____________________ of a star can be determined from its color
Fill in the blank(s) with correct word
temperature
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The expression(s) indicating the number of protons in a nucleus is
a. A. b. N. c. Z. d. Z + N. e. A – Z.
An object of mass m is attached to a horizontal spring, stretched to a displacement A from equilibrium and released, undergoing harmonic oscillations on a frictionless surface. The experiment is then repeated with a mass of 4m. Compared to the original total mechanical energy, the subsequent total mechanical energy of the object with mass 4m is
1.greater. 2.less. 3.equal.
Two long parallel wires are separated by 6.0 mm. The current in one of the wires is twice the other current. If the magnitude of the force on a 3.0-m length of one of the wires is equal to 8.0 ?N, what is the greater of the two currents?
a. 0.20 A b. 0.40 A c. 40 mA d. 20 mA e. 0.63 A
Ten seconds after starting from rest, a car is moving at 40 m/s. What is the car's acceleration?
A) 0.25 m/s2 B) 2.8 m/s2 C) 4.0 m/s2 D) 10 m/s2 E) 40 m/s2